electrical.xml

<?xml version="1.0"?>
<!--

  Short S.23 flying boat flight model for JSBSim.

    Copyright (C) 2012  Anders Gidenstam  (anders(at)gidenstam.org)

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.
  
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
  
    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  
-->
<system name="electrical">

 <documentation>
  Electrical services according to [Short:RN-3-1-37]:
    24 volts
      Navigation lights
      Landing searchlights (240W and 500W)
      W/T power supply
      Internal lighting
      Steward's call signals
      Power for flap motor
    12 volts
      Instrument lighting
      Engine starting
 </documentation>

 <documentation>
  Drawings and other important information in [Short:RN-3-1-37]:
    page
     124   Instrument lighting circuits.
     127   Fig. 18 Wireless power supply circuit diagram.
     142   Fig. 33 Cabin heating and ventilating.
     148   Fig. 38 Wireless short and medium wave.
     168   Fig. 53 Wiring for forward cabin.
     169   Fig. 54 Instruments and pitot heater circuit diagram.
     176   Fig. 20 Lighting services circuit diagram.
 </documentation>

 <documentation>
  Fuse circuits according to [Short:RN-3-1-37]:
    Control panel
      Switch No  Fuse No  Volt. Power  What
        1                 24V          Voltmeter
        2         1  8A   12V    48W   Instruments
        2         2  8A   12V    48W   Instruments
                  3  4A   24V    20W   Anchor and Steaming lights
                  4  4A   24V    12W   Identification light
                  5  4A   24V    24W   Steward's call signals
 One or 3         6  4A   24V    18W   Cockpit and wireless lights(wiring diag.)
  both? 3         6 12A   24V     ?W   Instrument heater (Fig 54, page 169)
                                       -> Later modification?
        4         7  8A   24V   108W   Corridor fwd and centre cabin
        4         8  8A   24V    72W   Promenade and aft cabin
        4         9  4A   24V    48W   Chart table, mail room, ...
        5        10 12A   24V   126W   Fwd and centre cabin roof, mooring comp.
        5        11 12A   24V   204W   Prom. and aft cabin and freight room roof
        6        12  4A   24V    20W   Port navigation light 
        6        13  4A   24V    30W   Tail and Starboard navigation light
                 14  4A   12V    30W   Signalling lamp
                 F   4A                Dynamo field
                 F   4A                Dynamo field

  Additional fuses on the main switch board according to [Cassidy:2004:FE]:
    Type          Fuse    What
    Rotax N5 EB   15A     Engine starting (solenoid)
    Rotax N5       4A     Flap indicator
    Rotax N5 EB   15A     Flap motor changeover switch
    Rotax N5 DN   50A     Flap motor (motor power 0.5hp [Short:RN-3-1-37])
    Rotax N5 EB   20A     Bow searchlight
    Rotax N5 EB   50A     Wing searchlight
    Rotax N5 EB   15A     Searchlight solenoid
    Rotax N5 EB   15A     Instrument heaters
    Rotax N4 EB    4A     Thermo-electric control of cabin heating. (fr. Fig.33)
 </documentation>

 <!-- ======================================================================
      Switches
 -->
 <!-- On the main switchboard switchbox. Range: 0 and 1. -->
 <property value="0.0">electrical/main-switchbox/switch-cmd-norm[0]</property>
 <property value="0.0">electrical/main-switchbox/switch-cmd-norm[1]</property>
 <property value="0.0">electrical/main-switchbox/switch-cmd-norm[2]</property>
 <property value="0.0">electrical/main-switchbox/switch-cmd-norm[3]</property>
 <property value="0.0">electrical/main-switchbox/switch-cmd-norm[4]</property>
 <property value="0.0">electrical/main-switchbox/switch-cmd-norm[5]</property>

 <!-- The four brass switches on the main switchboard rack. Range: 0 and 1.
      Assumed order: left top and bottom; right top and bottom.
      The upper right one is a double switch.
      The chart table light switch is at the chart table. -->
 <property value="0.0">electrical/control-panel/loading-cmd-norm[0]</property>
 <property value="0.0">electrical/control-panel/receiving-cmd-norm[0]</property>
 <property value="0.0">electrical/control-panel/mail-cmd-norm[0]</property>
 <property value="0.0">electrical/control-panel/mail-cmd-norm[1]</property>
 <property value="0.0">electrical/control-panel/stowage-cmd-norm[0]</property>
 <property value="0.0">electrical/control-panel/chart-cmd-norm[0]</property>

 <!-- Rheostats on the instrument lighting panel. Range: 0 to 1. -->
 <property value="0.0">electrical/instrument-lights/switch-cmd-norm[0]</property>
 <property value="0.0">electrical/instrument-lights/switch-cmd-norm[1]</property>
 <property value="0.0">electrical/instrument-lights/switch-cmd-norm[2]</property>
 <property value="0.0">electrical/instrument-lights/switch-cmd-norm[3]</property>
 <property value="0.0">electrical/instrument-lights/switch-cmd-norm[4]</property>
 <property value="0.0">electrical/instrument-lights/switch-cmd-norm[5]</property>
 <property value="0.0">electrical/instrument-lights/switch-cmd-norm[6]</property>
 <property value="0.0">electrical/instrument-lights/switch-cmd-norm[7]</property>
 <property value="0.0">electrical/instrument-lights/switch-cmd-norm[8]</property>

 <!-- Switches on the light switch panel. -->
 <!-- Range: 0 and 1. -->
 <property value="0.0">electrical/light-switch-panel/steaming-cmd-norm</property>
 <property value="0.0">electrical/light-switch-panel/identification-cmd-norm</property>
 <!-- Range: 0, 0.5 and 1. -->
 <property value="0.0">electrical/light-switch-panel/landing-cmd-norm</property>
 <!-- Range: 0 to 1. -->
 <property value="0.0">electrical/light-switch-panel/roof-cmd-norm[0]</property>
 <property value="0.0">electrical/light-switch-panel/roof-cmd-norm[1]</property>
 <!-- Range: 0 and 1. Actually located at the bow. -->
 <property value="0.0">electrical/light-switch-panel/anchor-cmd-norm</property>

 <!-- ======================================================================
      Fuses
 -->
 <property value="1.0">electrical/main-switchbox/fuse-serviceable[0]</property>
 <property value="1.0">electrical/main-switchbox/fuse-serviceable[1]</property>
 <property value="1.0">electrical/main-switchbox/fuse-serviceable[2]</property>
 <property value="1.0">electrical/main-switchbox/fuse-serviceable[3]</property>
 <property value="1.0">electrical/main-switchbox/fuse-serviceable[4]</property>
 <property value="1.0">electrical/main-switchbox/fuse-serviceable[5]</property>
 <property value="1.0">electrical/main-switchbox/fuse-serviceable[6]</property>
 <property value="1.0">electrical/main-switchbox/fuse-serviceable[7]</property>
 <property value="1.0">electrical/main-switchbox/fuse-serviceable[8]</property>
 <property value="1.0">electrical/main-switchbox/fuse-serviceable[9]</property>
 <property value="1.0">electrical/main-switchbox/fuse-serviceable[10]</property>
 <property value="1.0">electrical/main-switchbox/fuse-serviceable[11]</property>
 <property value="1.0">electrical/main-switchbox/fuse-serviceable[12]</property>
 <property value="1.0">electrical/main-switchbox/fuse-serviceable[13]</property>

 <!-- ======================================================================
      Battery
 -->
 <documentation>
  "The battery was a 24 volt 18 cell NiFe alkaline battery with a
  capacity of 55 ampere hours." ([Short:RN-3-1-37],[Cassidy:2004:FE])
 </documentation>

 <!-- Battery inputs. -->
 <property value="0.0">electrical/battery/current-A[0]</property> <!-- 24V -->
 <property value="0.0">electrical/battery/current-A[1]</property> <!-- 12V -->

 <!-- Battery properties. -->
 <property value="50.0">electrical/battery/initial-capacity-Ah</property>
 <property value="55.0">electrical/battery/max-capacity-Ah</property>
 <property value="0.015">electrical/battery/internal-resistance-ohm</property>
 <channel name="Battery">

  <fcs_function name="electrical/battery/capacity-Ah">
   <function>
    <difference>
     <property>electrical/battery/initial-capacity-Ah</property>
     <property>electrical/battery/consumed-Ah</property>
    </difference>
   </function>
   <clipto>
    <min>0.0</min>
    <max>electrical/battery/max-capacity-Ah</max>
   </clipto>
  </fcs_function>

  <fcs_function name="electrical/battery/open-circuit-voltage-V">
   <function>
    <table>
     <independentVar lookup="row">electrical/battery/capacity-Ah</independentVar>
     <tableData> <!-- Guessed. -->
        0.0  0.0
        2.0 12.0
       20.0 20.0
       55.0 24.0
     </tableData>
    </table>
   </function>
  </fcs_function>

  <fcs_function name="electrical/battery/voltage-V">
   <function>
    <difference>
     <property>electrical/battery/open-circuit-voltage-V</property>
     <sum>
      <product>
       <property>electrical/battery/internal-resistance-ohm</property>
       <max>
        <value>0.0</value>
        <property>electrical/battery/current-A[0]</property>
       </max>
      </product>
      <product>
       <value>0.5</value>
       <property>electrical/battery/internal-resistance-ohm</property>
       <max>
        <value>0.0</value>
        <property>electrical/battery/current-A[1]</property>
       </max>
      </product>
     </sum>
    </difference>
   </function>
   <clipto>
    <min>0.0</min>
    <max>48.0</max>
   </clipto>
  </fcs_function>

  <summer name="electrical/battery/total-current-A">
   <input>electrical/battery/current-A[0]</input>
   <input>electrical/battery/current-A[1]</input>
  </summer>

  <integrator name="electrical/battery/consumed-Ah">
   <input>electrical/battery/total-current-A</input>
   <c1>0.0002778</c1>
   <!-- clipto>
    <min>0.0</min>
    <max>electrical/battery/max-capacity-Ah</max>
   </clipto -->
  </integrator>

 </channel>

 <!-- ======================================================================
      Supply buses
 -->
 <channel name="Supply">

  <!-- The 24V bus. This bus is powered by the battery and the generators. -->
  <fcs_function name="electrical/bus[0]/voltage-V">
   <function>
    <max>
     <property>electrical/battery/voltage-V</property>
     <property>propulsion/engine[1]/generator-voltage-V</property>
     <property>propulsion/engine[2]/generator-voltage-V</property>
    </max>
   </function>
   <clipto>
    <min>0.0</min>
    <max>48.0</max>
   </clipto>
  </fcs_function>

  <!-- The 12V bus. This bus is powered only by the battery. -->
  <fcs_function name="electrical/bus[1]/voltage-V">
   <function>
    <product>
     <value>0.5</value>
     <property>electrical/battery/voltage-V</property>
    </product>
   </function>
   <clipto>
    <min>0.0</min>
    <max>48.0</max>
   </clipto>
  </fcs_function>

 </channel>

 <!-- ======================================================================
      Main switchbox switch 1 - Voltmeter.
 -->
 <channel name="Voltmeter">

  <switch name="electrical/main-switchbox/switch-voltage-V[0]">
   <default value="0.0"/>
   <test logic="AND" value="electrical/bus[0]/voltage-V">
     electrical/main-switchbox/switch-cmd-norm[0] GT 0.5
   </test>
  </switch>

  <lag_filter name="electrical/main-switchbox/voltmeter-voltage-V">
   <input>electrical/main-switchbox/switch-voltage-V[0]</input>
   <c1>4.0</c1>
  </lag_filter>

 </channel>
 <channel name="Ammeter">

  <!-- FIXME: This isn't really the right current to display. -->
  <lag_filter name="electrical/main-switchbox/ammeter-current-A">
   <input>electrical/voltage-regulators/battery-current-A</input>
   <c1>4.0</c1>
  </lag_filter>

 </channel>

 <!-- ======================================================================
      Main switchbox switch 2, fuse 1 and 2 circuits - Instrument lights
 -->
 <documentation>
  Instrument lighting circuits from [Short:RN-3-1-37] page 124:
    Rheostat #bulbs Fuse What
      1       3      1     Captain's altimeter, DG, AI
      2       2      1     Captain's ASI, turn indicator, clock
      3       1      1     Captain's VSI, fore-aft lever
      4       2      2     Engine speed indicators
      5       2      2     First officer's ASI, turn indicator, oil pressure
      6       2      2     Boost gauges, First officer's altimeter
      7       4      1     First officer's compass (+ 15.4 ohm resistor)
      8       4      2     Captain's compass       (+ 15.4 ohm resistor)
      9       2      1     Autopilot

  Assumptions:
    The "typical" light bulb is a 4W 12V one (internal resistance 36 ohm).
    All light bulbs are connected in parallel.
 </documentation>
 <channel name="Instrument lights">

  <switch name="electrical/main-switchbox/switch-voltage-V[1]">
   <default value="0.0"/>
   <test logic="AND" value="electrical/bus[1]/voltage-V">
     electrical/main-switchbox/switch-cmd-norm[1] GT 0.5
   </test>
  </switch>

  <fcs_function name="electrical/main-switchbox/fuse-voltage-V[0]">
   <function>
    <product>
     <property>electrical/main-switchbox/fuse-serviceable[0]</property>
     <property>electrical/main-switchbox/switch-voltage-V[1]</property>
    </product>
   </function>
  </fcs_function>
  <fcs_function name="electrical/main-switchbox/fuse-voltage-V[1]">
   <function>
    <product>
     <property>electrical/main-switchbox/fuse-serviceable[1]</property>
     <property>electrical/main-switchbox/switch-voltage-V[1]</property>
    </product>
   </function>
  </fcs_function>

  <fcs_function name="electrical/instrument-lights/switch-resistance-ohm[0]">
   <function>
    <table>
     <independentVar lookup="row">electrical/instrument-lights/switch-cmd-norm[0]</independentVar>
     <tableData> <!-- Guessed: 300*(1-cmd.^0.25) -->
       0.00000   300.00000
       0.10000   131.29760
       0.20000    99.37791
       0.30000    77.97516
       0.40000    61.41878
       0.50000    47.73108
       0.60000    35.96648
       0.70000    25.59263
       0.80000    16.27752
       0.90000     7.79888
       1.00000     0.00000
     </tableData>
    </table>
   </function>
  </fcs_function>
  <fcs_function name="electrical/instrument-lights/switch-resistance-ohm[1]">
   <function>
    <table>
     <independentVar lookup="row">electrical/instrument-lights/switch-cmd-norm[1]</independentVar>
     <tableData> <!-- Guessed: 300*(1-cmd.^0.25) -->
       0.00000   300.00000
       0.10000   131.29760
       0.20000    99.37791
       0.30000    77.97516
       0.40000    61.41878
       0.50000    47.73108
       0.60000    35.96648
       0.70000    25.59263
       0.80000    16.27752
       0.90000     7.79888
       1.00000     0.00000
     </tableData>
    </table>
   </function>
  </fcs_function>
  <fcs_function name="electrical/instrument-lights/switch-resistance-ohm[2]">
   <function>
    <table>
     <independentVar lookup="row">electrical/instrument-lights/switch-cmd-norm[2]</independentVar>
     <tableData> <!-- Guessed: 300*(1-cmd.^0.25) -->
       0.00000   300.00000
       0.10000   131.29760
       0.20000    99.37791
       0.30000    77.97516
       0.40000    61.41878
       0.50000    47.73108
       0.60000    35.96648
       0.70000    25.59263
       0.80000    16.27752
       0.90000     7.79888
       1.00000     0.00000
     </tableData>
    </table>
   </function>
  </fcs_function>
  <fcs_function name="electrical/instrument-lights/switch-resistance-ohm[3]">
   <function>
    <table>
     <independentVar lookup="row">electrical/instrument-lights/switch-cmd-norm[3]</independentVar>
     <tableData> <!-- Guessed: 300*(1-cmd.^0.25) -->
       0.00000   300.00000
       0.10000   131.29760
       0.20000    99.37791
       0.30000    77.97516
       0.40000    61.41878
       0.50000    47.73108
       0.60000    35.96648
       0.70000    25.59263
       0.80000    16.27752
       0.90000     7.79888
       1.00000     0.00000
     </tableData>
    </table>
   </function>
  </fcs_function>
  <fcs_function name="electrical/instrument-lights/switch-resistance-ohm[4]">
   <function>
    <table>
     <independentVar lookup="row">electrical/instrument-lights/switch-cmd-norm[4]</independentVar>
     <tableData> <!-- Guessed: 300*(1-cmd.^0.25) -->
       0.00000   300.00000
       0.10000   131.29760
       0.20000    99.37791
       0.30000    77.97516
       0.40000    61.41878
       0.50000    47.73108
       0.60000    35.96648
       0.70000    25.59263
       0.80000    16.27752
       0.90000     7.79888
       1.00000     0.00000
     </tableData>
    </table>
   </function>
  </fcs_function>
  <fcs_function name="electrical/instrument-lights/switch-resistance-ohm[5]">
   <function>
    <table>
     <independentVar lookup="row">electrical/instrument-lights/switch-cmd-norm[5]</independentVar>
     <tableData> <!-- Guessed: 300*(1-cmd.^0.25) -->
       0.00000   300.00000
       0.10000   131.29760
       0.20000    99.37791
       0.30000    77.97516
       0.40000    61.41878
       0.50000    47.73108
       0.60000    35.96648
       0.70000    25.59263
       0.80000    16.27752
       0.90000     7.79888
       1.00000     0.00000
     </tableData>
    </table>
   </function>
  </fcs_function>
  <fcs_function name="electrical/instrument-lights/switch-resistance-ohm[6]">
   <function>
    <table>
     <independentVar lookup="row">electrical/instrument-lights/switch-cmd-norm[6]</independentVar>
     <tableData> <!-- Guessed: 300*(1-cmd.^0.25) -->
       0.00000   300.00000
       0.10000   131.29760
       0.20000    99.37791
       0.30000    77.97516
       0.40000    61.41878
       0.50000    47.73108
       0.60000    35.96648
       0.70000    25.59263
       0.80000    16.27752
       0.90000     7.79888
       1.00000     0.00000
     </tableData>
    </table>
   </function>
  </fcs_function>
  <fcs_function name="electrical/instrument-lights/switch-resistance-ohm[7]">
   <function>
    <table>
     <independentVar lookup="row">electrical/instrument-lights/switch-cmd-norm[7]</independentVar>
     <tableData> <!-- Guessed: 300*(1-cmd.^0.25) -->
       0.00000   300.00000
       0.10000   131.29760
       0.20000    99.37791
       0.30000    77.97516
       0.40000    61.41878
       0.50000    47.73108
       0.60000    35.96648
       0.70000    25.59263
       0.80000    16.27752
       0.90000     7.79888
       1.00000     0.00000
     </tableData>
    </table>
   </function>
  </fcs_function>
  <fcs_function name="electrical/instrument-lights/switch-resistance-ohm[8]">
   <function>
    <table>
     <independentVar lookup="row">electrical/instrument-lights/switch-cmd-norm[8]</independentVar>
     <tableData> <!-- Guessed: 300*(1-cmd.^0.25) -->
       0.00000   300.00000
       0.10000   131.29760
       0.20000    99.37791
       0.30000    77.97516
       0.40000    61.41878
       0.50000    47.73108
       0.60000    35.96648
       0.70000    25.59263
       0.80000    16.27752
       0.90000     7.79888
       1.00000     0.00000
     </tableData>
    </table>
   </function>
  </fcs_function>

  <fcs_function name="electrical/instrument-lights/switch-current-A[0]">
   <function>
    <quotient>
     <property>electrical/main-switchbox/fuse-voltage-V[0]</property>
     <sum>
      <property>electrical/instrument-lights/switch-resistance-ohm[0]</property>
      <value>12.0</value> <!-- 3 bulbs in parallel. -->
     </sum>
    </quotient>
   </function>
  </fcs_function>
  <fcs_function name="electrical/instrument-lights/switch-current-A[1]">
   <function>
    <quotient>
     <property>electrical/main-switchbox/fuse-voltage-V[0]</property>
     <sum>
      <property>electrical/instrument-lights/switch-resistance-ohm[1]</property>
      <value>18.0</value> <!-- 2 bulbs in parallel. -->
     </sum>
    </quotient>
   </function>
  </fcs_function>
  <fcs_function name="electrical/instrument-lights/switch-current-A[2]">
   <function>
    <quotient>
     <property>electrical/main-switchbox/fuse-voltage-V[0]</property>
     <sum>
      <property>electrical/instrument-lights/switch-resistance-ohm[2]</property>
      <value>36.0</value> <!-- 1 bulbs in parallel. -->
     </sum>
    </quotient>
   </function>
  </fcs_function>
  <fcs_function name="electrical/instrument-lights/switch-current-A[3]">
   <function>
    <quotient>
     <property>electrical/main-switchbox/fuse-voltage-V[1]</property>
     <sum>
      <property>electrical/instrument-lights/switch-resistance-ohm[3]</property>
      <value>18.0</value> <!-- 2 bulbs in parallel. -->
     </sum>
    </quotient>
   </function>
  </fcs_function>
  <fcs_function name="electrical/instrument-lights/switch-current-A[4]">
   <function>
    <quotient>
     <property>electrical/main-switchbox/fuse-voltage-V[1]</property>
     <sum>
      <property>electrical/instrument-lights/switch-resistance-ohm[4]</property>
      <value>18.0</value> <!-- 2 bulbs in parallel. -->
     </sum>
    </quotient>
   </function>
  </fcs_function>
  <fcs_function name="electrical/instrument-lights/switch-current-A[5]">
   <function>
    <quotient>
     <property>electrical/main-switchbox/fuse-voltage-V[1]</property>
     <sum>
      <property>electrical/instrument-lights/switch-resistance-ohm[5]</property>
      <value>18.0</value> <!-- 2 bulbs in parallel. -->
     </sum>
    </quotient>
   </function>
  </fcs_function>
  <fcs_function name="electrical/instrument-lights/switch-current-A[6]">
   <function>
    <quotient>
     <property>electrical/main-switchbox/fuse-voltage-V[0]</property>
     <sum>
      <property>electrical/instrument-lights/switch-resistance-ohm[6]</property>
      <value>9.0</value> <!-- 4 bulbs in parallel. -->
     </sum>
    </quotient>
   </function>
  </fcs_function>
  <fcs_function name="electrical/instrument-lights/switch-current-A[7]">
   <function>
    <quotient>
     <property>electrical/main-switchbox/fuse-voltage-V[1]</property>
     <sum>
      <property>electrical/instrument-lights/switch-resistance-ohm[7]</property>
      <value>9.0</value> <!-- 4 bulbs in parallel. -->
     </sum>
    </quotient>
   </function>
  </fcs_function>
  <fcs_function name="electrical/instrument-lights/switch-current-A[8]">
   <function>
    <quotient>
     <property>electrical/main-switchbox/fuse-voltage-V[0]</property>
     <sum>
      <property>electrical/instrument-lights/switch-resistance-ohm[8]</property>
      <value>18.0</value> <!-- 2 bulbs in parallel. -->
     </sum>
    </quotient>
   </function>
  </fcs_function>

  <fcs_function name="electrical/instrument-lights/switch-power-W[0]">
   <function>
    <product>
     <property>electrical/instrument-lights/switch-current-A[0]</property>
     <difference>
      <property>electrical/main-switchbox/fuse-voltage-V[0]</property>
      <product>
       <property>electrical/instrument-lights/switch-current-A[0]</property>
       <property>electrical/instrument-lights/switch-resistance-ohm[0]</property>
      </product>
     </difference>
    </product>
   </function>
  </fcs_function>

  <fcs_function name="electrical/instrument-lights/altimeter-power-W[0]">
   <function>
    <product>
     <value>0.333333</value>
     <property>electrical/instrument-lights/switch-power-W[0]</property>
    </product>
   </function>
   <output>/systems/electrical/lamps/instruments/altimeter-power-W[0]</output>
  </fcs_function>

  <fcs_function name="electrical/instrument-lights/directional-power-W">
   <function>
    <product>
     <value>0.333333</value>
     <property>electrical/instrument-lights/switch-power-W[0]</property>
    </product>
   </function>
   <output>/systems/electrical/lamps/instruments/directional-power-W</output>
  </fcs_function>

  <fcs_function name="electrical/instrument-lights/attitude-power-W">
   <function>
    <product>
     <value>0.333333</value>
     <property>electrical/instrument-lights/switch-power-W[0]</property>
    </product>
   </function>
   <output>/systems/electrical/lamps/instruments/attitude-power-W</output>
  </fcs_function>

  <fcs_function name="electrical/instrument-lights/switch-power-W[1]">
   <function>
    <product>
     <property>electrical/instrument-lights/switch-current-A[1]</property>
     <difference>
      <property>electrical/main-switchbox/fuse-voltage-V[0]</property>
      <product>
       <property>electrical/instrument-lights/switch-current-A[1]</property>
       <property>electrical/instrument-lights/switch-resistance-ohm[1]</property>
      </product>
     </difference>
    </product>
   </function>
  </fcs_function>
  <fcs_function name="electrical/instrument-lights/asi-power-W">
   <function>
    <product>
     <value>0.5</value>
     <property>electrical/instrument-lights/switch-power-W[1]</property>
    </product>
   </function>
   <output>/systems/electrical/lamps/instruments/asi-power-W</output>
  </fcs_function>
  <fcs_function name="electrical/instrument-lights/turn-power-W[0]">
   <function>
    <product>
     <value>0.5</value>
     <property>electrical/instrument-lights/switch-power-W[1]</property>
    </product>
   </function>
   <output>/systems/electrical/lamps/instruments/turn-power-W[0]</output>
  </fcs_function>
  <fcs_function name="electrical/instrument-lights/clock-power-W">
   <function>
    <product>
     <value>0.5</value>
     <property>electrical/instrument-lights/switch-power-W[1]</property>
    </product>
   </function>
   <output>/systems/electrical/lamps/instruments/clock-power-W</output>
  </fcs_function>

  <fcs_function name="electrical/instrument-lights/switch-power-W[2]">
   <function>
    <product>
     <property>electrical/instrument-lights/switch-current-A[2]</property>
     <difference>
      <property>electrical/main-switchbox/fuse-voltage-V[0]</property>
      <product>
       <property>electrical/instrument-lights/switch-current-A[2]</property>
       <property>electrical/instrument-lights/switch-resistance-ohm[2]</property>
      </product>
     </difference>
    </product>
   </function>
  </fcs_function>
  <fcs_function name="electrical/instrument-lights/vsi-power-W">
   <function>
    <property>electrical/instrument-lights/switch-power-W[2]</property>
   </function>
   <output>/systems/electrical/lamps/instruments/vsi-power-W</output>
  </fcs_function>
  <fcs_function name="electrical/instrument-lights/fore-aft-lever-power-W">
   <function>
    <property>electrical/instrument-lights/switch-power-W[2]</property>
   </function>
   <output>/systems/electrical/lamps/instruments/fore-aft-level-power-W</output>
  </fcs_function>

  <fcs_function name="electrical/instrument-lights/switch-power-W[3]">
   <function>
    <product>
     <property>electrical/instrument-lights/switch-current-A[3]</property>
     <difference>
      <property>electrical/main-switchbox/fuse-voltage-V[1]</property>
      <product>
       <property>electrical/instrument-lights/switch-current-A[3]</property>
       <property>electrical/instrument-lights/switch-resistance-ohm[3]</property>
      </product>
     </difference>
    </product>
   </function>
  </fcs_function>
  <fcs_function name="electrical/instrument-lights/engine-speed-power-W[0]">
   <function>
    <product>
     <value>0.5</value>
     <property>electrical/instrument-lights/switch-power-W[3]</property>
    </product>
   </function>
   <output>/systems/electrical/lamps/instruments/engine-speed-power-W[0]</output>
  </fcs_function>
  <fcs_function name="electrical/instrument-lights/engine-speed-power-W[1]">
   <function>
    <product>
     <value>0.5</value>
     <property>electrical/instrument-lights/switch-power-W[3]</property>
    </product>
   </function>
   <output>/systems/electrical/lamps/instruments/engine-speed-power-W[1]</output>
  </fcs_function>

  <fcs_function name="electrical/instrument-lights/switch-power-W[4]">
   <function>
    <product>
     <property>electrical/instrument-lights/switch-current-A[4]</property>
     <difference>
      <property>electrical/main-switchbox/fuse-voltage-V[1]</property>
      <product>
       <property>electrical/instrument-lights/switch-current-A[4]</property>
       <property>electrical/instrument-lights/switch-resistance-ohm[4]</property>
      </product>
     </difference>
    </product>
   </function>
  </fcs_function>
  <fcs_function name="electrical/instrument-lights/oil-pressure-power-W[0]">
   <function>
    <product>
     <value>0.5</value>
     <property>electrical/instrument-lights/switch-power-W[4]</property>
    </product>
   </function>
   <output>/systems/electrical/lamps/instruments/oil-pressure-power-W</output>
  </fcs_function>
  <fcs_function name="electrical/instrument-lights/asi-power-W[1]">
   <function>
    <product>
     <value>0.5</value>
     <property>electrical/instrument-lights/switch-power-W[4]</property>
    </product>
   </function>
   <output>/systems/electrical/lamps/instruments/asi-power-W[1]</output>
  </fcs_function>
  <fcs_function name="electrical/instrument-lights/turn-power-W[1]">
   <function>
    <product>
     <value>0.5</value>
     <property>electrical/instrument-lights/switch-power-W[4]</property>
    </product>
   </function>
   <output>/systems/electrical/lamps/instruments/turn-power-W[1]</output>
  </fcs_function>

  <fcs_function name="electrical/instrument-lights/switch-power-W[5]">
   <function>
    <product>
     <property>electrical/instrument-lights/switch-current-A[5]</property>
     <difference>
      <property>electrical/main-switchbox/fuse-voltage-V[1]</property>
      <product>
       <property>electrical/instrument-lights/switch-current-A[5]</property>
       <property>electrical/instrument-lights/switch-resistance-ohm[5]</property>
      </product>
     </difference>
    </product>
   </function>
  </fcs_function>
  <fcs_function name="electrical/instrument-lights/boost-power-W">
   <function>
    <product>
     <value>0.5</value>
     <property>electrical/instrument-lights/switch-power-W[5]</property>
    </product>
   </function>
   <output>/systems/electrical/lamps/instruments/boost-power-W</output>
  </fcs_function>
  <fcs_function name="electrical/instrument-lights/altimeter-power-W[1]">
   <function>
    <product>
     <value>0.5</value>
     <property>electrical/instrument-lights/switch-power-W[5]</property>
    </product>
   </function>
   <output>/systems/electrical/lamps/instruments/altimeter-power-W[1]</output>
  </fcs_function>

  <fcs_function name="electrical/instrument-lights/switch-power-W[6]">
   <function>
    <product>
     <property>electrical/instrument-lights/switch-current-A[6]</property>
     <difference>
      <property>electrical/main-switchbox/fuse-voltage-V[0]</property>
      <product>
       <property>electrical/instrument-lights/switch-current-A[6]</property>
       <property>electrical/instrument-lights/switch-resistance-ohm[6]</property>
      </product>
     </difference>
    </product>
   </function>
  </fcs_function>
  <fcs_function name="electrical/instrument-lights/compass-power-W[1]">
   <function>
    <property>electrical/instrument-lights/switch-power-W[6]</property>
   </function>
   <output>/systems/electrical/lamps/instruments/compass-power-W[1]</output>
  </fcs_function>

  <fcs_function name="electrical/instrument-lights/switch-power-W[7]">
   <function>
    <product>
     <property>electrical/instrument-lights/switch-current-A[7]</property>
     <difference>
      <property>electrical/main-switchbox/fuse-voltage-V[1]</property>
      <product>
       <property>electrical/instrument-lights/switch-current-A[7]</property>
       <property>electrical/instrument-lights/switch-resistance-ohm[7]</property>
      </product>
     </difference>
    </product>
   </function>
  </fcs_function>
  <fcs_function name="electrical/instrument-lights/compass-power-W[0]">
   <function>
    <property>electrical/instrument-lights/switch-power-W[7]</property>
   </function>
   <output>/systems/electrical/lamps/instruments/compass-power-W[0]</output>
  </fcs_function>

  <fcs_function name="electrical/instrument-lights/switch-power-W[8]">
   <function>
    <product>
     <property>electrical/instrument-lights/switch-current-A[8]</property>
     <difference>
      <property>electrical/main-switchbox/fuse-voltage-V[0]</property>
      <product>
       <property>electrical/instrument-lights/switch-current-A[8]</property>
       <property>electrical/instrument-lights/switch-resistance-ohm[8]</property>
      </product>
     </difference>
    </product>
   </function>
  </fcs_function>
  <fcs_function name="electrical/instrument-lights/autopilot-power-W">
   <function>
    <property>electrical/instrument-lights/switch-power-W[8]</property>
   </function>
   <output>/systems/electrical/lamps/instruments/autopilot-power-W</output>
  </fcs_function>

  <summer name="electrical/main-switchbox/fuse-current-A[0]">
   <input>electrical/instrument-lights/switch-current-A[0]</input>
   <input>electrical/instrument-lights/switch-current-A[1]</input>
   <input>electrical/instrument-lights/switch-current-A[2]</input>
   <input>electrical/instrument-lights/switch-current-A[6]</input>
   <input>electrical/instrument-lights/switch-current-A[8]</input>
  </summer>

  <summer name="electrical/main-switchbox/fuse-current-A[1]">
   <input>electrical/instrument-lights/switch-current-A[3]</input>
   <input>electrical/instrument-lights/switch-current-A[4]</input>
   <input>electrical/instrument-lights/switch-current-A[5]</input>
   <input>electrical/instrument-lights/switch-current-A[7]</input>
  </summer>

 </channel>

 <!-- ======================================================================
      Main switchbox fuse 3 circuit - anchor and steaming lights 
 -->
 <channel name="Anchor and steaming lights">

  <switch name="electrical/light-switch-panel/anchor-voltage-V">
   <default value="0.0"/>
   <test logic="AND" value="electrical/bus[0]/voltage-V">
     electrical/light-switch-panel/anchor-cmd-norm GT 0.5
     electrical/main-switchbox/fuse-serviceable[2] GT 0.5
   </test>
  </switch>

  <switch name="electrical/light-switch-panel/steaming-voltage-V">
   <default value="0.0"/>
   <test logic="AND" value="electrical/bus[0]/voltage-V">
     electrical/light-switch-panel/steaming-cmd-norm GT 0.5
     electrical/main-switchbox/fuse-serviceable[2] GT 0.5
   </test>
  </switch>

  <fcs_function name="electrical/lamps/navigation/anchor-current-A">
   <function>
    <quotient>
     <property>electrical/light-switch-panel/anchor-voltage-V</property>
     <value>57.6</value>
    </quotient>
   </function>
  </fcs_function>

  <fcs_function name="electrical/lamps/navigation/steaming-current-A">
   <function>
    <quotient>
     <property>electrical/light-switch-panel/steaming-voltage-V</property>
     <value>57.6</value>
    </quotient>
   </function>
  </fcs_function>

  <fcs_function name="electrical/lamps/navigation/anchor-power-W">
   <function>
    <product>
     <property>electrical/light-switch-panel/anchor-voltage-V</property>
     <property>electrical/lamps/navigation/anchor-current-A</property>
    </product>
   </function>
   <output>/systems/electrical/lamps/navigation/anchor-power-W</output>
  </fcs_function>

  <fcs_function name="electrical/lamps/navigation/steaming-power-W">
   <function>
    <product>
     <property>electrical/light-switch-panel/steaming-voltage-V</property>
     <property>electrical/lamps/navigation/steaming-current-A</property>
    </product>
   </function>
   <output>/systems/electrical/lamps/navigation/steaming-power-W</output>
  </fcs_function>

  <summer name="electrical/main-switchbox/fuse-current-A[2]">
   <input>electrical/lamps/navigation/anchor-current-A</input>
   <input>electrical/lamps/navigation/steaming-current-A</input>
  </summer>

 </channel>

 <!-- ======================================================================
      Main switchbox fuse 4 circuit - identification light
 -->
 <channel name="Identification light">

  <switch name="electrical/light-switch-panel/identification-voltage-V">
   <default value="0.0"/>
   <test logic="AND" value="electrical/bus[0]/voltage-V">
     electrical/light-switch-panel/identification-cmd-norm GT 0.5
     electrical/main-switchbox/fuse-serviceable[3] GT 0.5
   </test>
  </switch>

  <fcs_function name="electrical/lamps/navigation/identification-current-A">
   <function>
    <quotient>
     <property>electrical/light-switch-panel/identification-voltage-V</property>
     <value>48.0</value>
    </quotient>
   </function>
  </fcs_function>

  <fcs_function name="electrical/lamps/navigation/identification-power-W">
   <function>
    <product>
     <property>electrical/light-switch-panel/identification-voltage-V</property>
     <property>electrical/lamps/navigation/identification-current-A</property>
    </product>
   </function>
   <output>/systems/electrical/lamps/navigation/identification-power-W</output>
  </fcs_function>

  <summer name="electrical/main-switchbox/fuse-current-A[3]">
   <input>electrical/lamps/navigation/identification-current-A</input>
  </summer>

 </channel>

 <!-- ======================================================================
      Main switchbox switch 3 fuse 6 circuit - flight-deck roof lights
 -->
 <channel name="Flight-deck roof lights">

  <switch name="electrical/main-switchbox/switch-voltage-V[2]">
   <default value="0.0"/>
   <test logic="AND" value="electrical/bus[0]/voltage-V">
     electrical/main-switchbox/switch-cmd-norm[2] GT 0.5
     electrical/main-switchbox/fuse-serviceable[5] GT 0.5
   </test>
  </switch>

  <fcs_function name="electrical/light-switch-panel/dimmer-resistance-ohm[0]">
   <function>
    <table>
     <independentVar lookup="row">electrical/light-switch-panel/roof-cmd-norm[0]</independentVar>
     <tableData> <!-- Guessed: 1000*(1-cmd.^0.25) -->
       0.0000e+00   1.0000e+03
       1.0000e-01   4.3766e+02
       2.0000e-01   3.3126e+02
       3.0000e-01   2.5992e+02
       4.0000e-01   2.0473e+02
       5.0000e-01   1.5910e+02
       6.0000e-01   1.1989e+02
       7.0000e-01   8.5309e+01
       8.0000e-01   5.4258e+01
       9.0000e-01   2.5996e+01
       1.0000e+00   0.0000e+00
     </tableData>
    </table>
   </function>
  </fcs_function>

  <fcs_function name="electrical/light-switch-panel/dimmer-resistance-ohm[1]">
   <function>
    <table>
     <independentVar lookup="row">electrical/light-switch-panel/roof-cmd-norm[1]</independentVar>
     <tableData> <!-- Guessed: 1000*(1-cmd.^0.25) -->
       0.0000e+00   1.0000e+03
       1.0000e-01   4.3766e+02
       2.0000e-01   3.3126e+02
       3.0000e-01   2.5992e+02
       4.0000e-01   2.0473e+02
       5.0000e-01   1.5910e+02
       6.0000e-01   1.1989e+02
       7.0000e-01   8.5309e+01
       8.0000e-01   5.4258e+01
       9.0000e-01   2.5996e+01
       1.0000e+00   0.0000e+00
     </tableData>
    </table>
   </function>
  </fcs_function>

  <fcs_function name="electrical/lamps/flight-deck/roof-current-A[0]">
   <function>
    <quotient>
     <property>electrical/main-switchbox/switch-voltage-V[2]</property>
     <sum>
      <property>electrical/light-switch-panel/dimmer-resistance-ohm[0]</property>
      <value>96.0</value>
     </sum>
    </quotient>
   </function>
  </fcs_function>

  <fcs_function name="electrical/lamps/flight-deck/roof-current-A[1]">
   <function>
    <quotient>
     <property>electrical/main-switchbox/switch-voltage-V[2]</property>
     <sum>
      <property>electrical/light-switch-panel/dimmer-resistance-ohm[1]</property>
      <value>96.0</value>
     </sum>
    </quotient>
   </function>
  </fcs_function>

  <fcs_function name="electrical/lamps/flight-deck/roof-power-W[0]">
   <function>
    <product>
     <value>96.0</value>
     <property>electrical/lamps/flight-deck/roof-current-A[0]</property>
     <property>electrical/lamps/flight-deck/roof-current-A[0]</property>
    </product>
   </function>
   <output>/systems/electrical/lamps/flight-deck/roof-power-W[0]</output>
  </fcs_function>
  <fcs_function name="electrical/lamps/flight-deck/roof-power-norm[0]">
   <function>
    <quotient>
     <property>electrical/lamps/flight-deck/roof-power-W[0]</property>
     <value>6.0</value>
    </quotient>
   </function>
   <output>/systems/electrical/lamps/flight-deck/roof-power-norm[0]</output>
  </fcs_function>

  <fcs_function name="electrical/lamps/flight-deck/roof-power-W[1]">
   <function>
    <product>
     <value>96.0</value>
     <property>electrical/lamps/flight-deck/roof-current-A[1]</property>
     <property>electrical/lamps/flight-deck/roof-current-A[1]</property>
    </product>
   </function>
   <output>/systems/electrical/lamps/flight-deck/roof-power-W[1]</output>
  </fcs_function>
  <fcs_function name="electrical/lamps/flight-deck/roof-power-norm[1]">
   <function>
    <quotient>
     <property>electrical/lamps/flight-deck/roof-power-W[1]</property>
     <value>6.0</value>
    </quotient>
   </function>
   <output>/systems/electrical/lamps/flight-deck/roof-power-norm[1]</output>
  </fcs_function>

  <summer name="electrical/main-switchbox/fuse-current-A[5]">
   <input>electrical/lamps/flight-deck/roof-current-A[0]</input>
   <input>electrical/lamps/flight-deck/roof-current-A[1]</input>
  </summer>

 </channel>

 <!-- ======================================================================
      Main switchbox switch 4, fuse 7 circuits - Fore, Corridor, Centre cabins. 
 -->
 <channel name="Main switchbox switch 4 fuse 7">

  <switch name="electrical/main-switchbox/switch-voltage-V[3]">
   <default value="0.0"/>
   <test logic="AND" value="electrical/bus[0]/voltage-V">
     electrical/main-switchbox/switch-cmd-norm[3] GT 0.5
   </test>
  </switch>

  <fcs_function name="electrical/main-switchbox/fuse-voltage-V[6]">
   <function>
    <product>
     <property>electrical/main-switchbox/fuse-serviceable[6]</property>
     <property>electrical/main-switchbox/switch-voltage-V[3]</property>
    </product>
   </function>
  </fcs_function>

  <!-- summer name="electrical/main-switchbox/fuse-current-A[6]">
  </summer -->

 </channel>

 <!-- ======================================================================
      Main switchbox switch 4, fuse 8 circuits - Promenade and Aft cabins
 -->
 <channel name="Main switchbox switch 4 fuse 8">

  <fcs_function name="electrical/main-switchbox/fuse-voltage-V[7]">
   <function>
    <product>
     <property>electrical/main-switchbox/fuse-serviceable[7]</property>
     <property>electrical/main-switchbox/switch-voltage-V[3]</property>
    </product>
   </function>
  </fcs_function>

  <!-- summer name="electrical/main-switchbox/fuse-current-A[7]">
  </summer -->

 </channel>

 <!-- ======================================================================
      Main switchbox switch 4, fuse 9 circuits - Flight deck aft lights 
 -->
 <documentation>
  Fuse 9 lighting circuits from [Short:RN-3-1-37] page 175:
    Power  Switches       Description      Remark
     6W     at lamp        Chart table
     6W     ctrl panel #1  Loading          On the mail hatch?
     6W     ctrl panel #2  Receiving        Over the main switchboard?
     6+6W   ctrl panel #3  Mail room        2-in-1 switch
     6W     ctrl panel #3  Mail room
     6+6W   ctrl panel #4  Stowage room     In the spar compartment?

  The fuse load is noted as 48W.
 </documentation>
 <channel name="Main switchbox switch 4 fuse 9">

  <fcs_function name="electrical/main-switchbox/fuse-voltage-V[8]">
   <function>
    <product>
     <property>electrical/main-switchbox/fuse-serviceable[8]</property>
     <property>electrical/main-switchbox/switch-voltage-V[3]</property>
    </product>
   </function>
  </fcs_function>

  <switch name="electrical/control-panel/chart-voltage-V">
   <default value="0.0"/>
   <test logic="AND" value="electrical/main-switchbox/fuse-voltage-V[8]">
     electrical/control-panel/chart-cmd-norm GT 0.5
   </test>
  </switch>

  <switch name="electrical/control-panel/loading-voltage-V">
   <default value="0.0"/>
   <test logic="AND" value="electrical/main-switchbox/fuse-voltage-V[8]">
     electrical/control-panel/loading-cmd-norm GT 0.5
   </test>
  </switch>

  <switch name="electrical/control-panel/receiving-voltage-V">
   <default value="0.0"/>
   <test logic="AND" value="electrical/main-switchbox/fuse-voltage-V[8]">
     electrical/control-panel/receiving-cmd-norm GT 0.5
   </test>
  </switch>

  <switch name="electrical/control-panel/mail-voltage-V[0]">
   <default value="0.0"/>
   <test logic="AND" value="electrical/main-switchbox/fuse-voltage-V[8]">
     electrical/control-panel/mail-cmd-norm[0] GT 0.5
   </test>
  </switch>
  <switch name="electrical/control-panel/mail-voltage-V[1]">
   <default value="0.0"/>
   <test logic="AND" value="electrical/main-switchbox/fuse-voltage-V[8]">
     electrical/control-panel/mail-cmd-norm[1] GT 0.5
   </test>
  </switch>

  <switch name="electrical/control-panel/stowage-voltage-V[0]">
   <default value="0.0"/>
   <test logic="AND" value="electrical/main-switchbox/fuse-voltage-V[8]">
     electrical/control-panel/stowage-cmd-norm[0] GT 0.5
   </test>
  </switch>

  <fcs_function name="electrical/lamps/flight-deck/chart-current-A">
   <function>
    <quotient>
     <property>electrical/control-panel/chart-voltage-V</property>
     <value>96.0</value>
    </quotient>
   </function>
  </fcs_function>
  <fcs_function name="electrical/lamps/flight-deck/chart-power-W">
   <function>
    <product>
     <property>electrical/control-panel/chart-voltage-V</property>
     <property>electrical/lamps/flight-deck/chart-current-A</property>
    </product>
   </function>
   <output>/systems/electrical/lamps/flight-deck/chart-power-W</output>
  </fcs_function>
  <fcs_function name="electrical/lamps/flight-deck/chart-power-norm[0]">
   <function>
    <quotient>
     <property>electrical/lamps/flight-deck/chart-power-W[0]</property>
     <value>6.0</value>
    </quotient>
   </function>
   <output>/systems/electrical/lamps/flight-deck/chart-power-norm[0]</output>
  </fcs_function>

  <fcs_function name="electrical/lamps/flight-deck/loading-current-A">
   <function>
    <quotient>
     <property>electrical/control-panel/loading-voltage-V</property>
     <value>96.0</value>
    </quotient>
   </function>
  </fcs_function>
  <fcs_function name="electrical/lamps/flight-deck/loading-power-W">
   <function>
    <product>
     <property>electrical/control-panel/loading-voltage-V</property>
     <property>electrical/lamps/flight-deck/loading-current-A</property>
    </product>
   </function>
   <output>/systems/electrical/lamps/flight-deck/loading-power-W</output>
  </fcs_function>
  <fcs_function name="electrical/lamps/flight-deck/loading-power-norm[0]">
   <function>
    <quotient>
     <property>electrical/lamps/flight-deck/loading-power-W[0]</property>
     <value>6.0</value>
    </quotient>
   </function>
   <output>/systems/electrical/lamps/flight-deck/loading-power-norm[0]</output>
  </fcs_function>

  <fcs_function name="electrical/lamps/flight-deck/receiving-current-A">
   <function>
    <quotient>
     <property>electrical/control-panel/receiving-voltage-V</property>
     <value>96.0</value>
    </quotient>
   </function>
  </fcs_function>
  <fcs_function name="electrical/lamps/flight-deck/receiving-power-W">
   <function>
    <product>
     <property>electrical/control-panel/receiving-voltage-V</property>
     <property>electrical/lamps/flight-deck/receiving-current-A</property>
    </product>
   </function>
   <output>/systems/electrical/lamps/flight-deck/receiving-power-W</output>
  </fcs_function>
  <fcs_function name="electrical/lamps/flight-deck/receiving-power-norm[0]">
   <function>
    <quotient>
     <property>electrical/lamps/flight-deck/receiving-power-W[0]</property>
     <value>6.0</value>
    </quotient>
   </function>
   <output>/systems/electrical/lamps/flight-deck/receiving-power-norm[0]</output>
  </fcs_function>

  <fcs_function name="electrical/lamps/flight-deck/mail-current-A[0]">
   <function>
    <quotient>
     <property>electrical/control-panel/mail-voltage-V[0]</property>
     <value>48.0</value>
    </quotient>
   </function>
  </fcs_function>
  <fcs_function name="electrical/lamps/flight-deck/mail-power-W[0]">
   <function>
    <product>
     <property>electrical/control-panel/mail-voltage-V[0]</property>
     <property>electrical/lamps/flight-deck/mail-current-A[0]</property>
    </product>
   </function>
   <output>/systems/electrical/lamps/flight-deck/mail-power-W[0]</output>
  </fcs_function>
  <fcs_function name="electrical/lamps/flight-deck/mail-power-norm[0]">
   <function>
    <quotient>
     <property>electrical/lamps/flight-deck/mail-power-W[0]</property>
     <value>12.0</value>
    </quotient>
   </function>
   <output>/systems/electrical/lamps/flight-deck/mail-power-norm[0]</output>
  </fcs_function>

  <fcs_function name="electrical/lamps/flight-deck/mail-current-A[1]">
   <function>
    <quotient>
     <property>electrical/control-panel/mail-voltage-V[1]</property>
     <value>96.0</value>
    </quotient>
   </function>
  </fcs_function>
  <fcs_function name="electrical/lamps/flight-deck/mail-power-W[1]">
   <function>
    <product>
     <property>electrical/control-panel/mail-voltage-V[1]</property>
     <property>electrical/lamps/flight-deck/mail-current-A[1]</property>
    </product>
   </function>
   <output>/systems/electrical/lamps/flight-deck/mail-power-W[1]</output>
  </fcs_function>
  <fcs_function name="electrical/lamps/flight-deck/mail-power-norm[1]">
   <function>
    <quotient>
     <property>electrical/lamps/flight-deck/mail-power-W[1]</property>
     <value>6.0</value>
    </quotient>
   </function>
   <output>/systems/electrical/lamps/flight-deck/mail-power-norm[1]</output>
  </fcs_function>

  <fcs_function name="electrical/lamps/flight-deck/stowage-current-A">
   <function>
    <quotient>
     <property>electrical/control-panel/stowage-voltage-V</property>
     <value>48.0</value>
    </quotient>
   </function>
  </fcs_function>
  <fcs_function name="electrical/lamps/flight-deck/stowage-power-W">
   <function>
    <product>
     <property>electrical/control-panel/stowage-voltage-V</property>
     <property>electrical/lamps/flight-deck/stowage-current-A</property>
    </product>
   </function>
   <output>/systems/electrical/lamps/flight-deck/stowage-power-W</output>
  </fcs_function>
  <fcs_function name="electrical/lamps/flight-deck/stowage-power-norm[0]">
   <function>
    <quotient>
     <property>electrical/lamps/flight-deck/stowage-power-W[0]</property>
     <value>12.0</value>
    </quotient>
   </function>
   <output>/systems/electrical/lamps/flight-deck/stowage-power-norm[0]</output>
  </fcs_function>

  <summer name="electrical/main-switchbox/fuse-current-A[8]">
   <input>electrical/lamps/flight-deck/chart-current-A</input>
   <input>electrical/lamps/flight-deck/loading-current-A</input>
   <input>electrical/lamps/flight-deck/receiving-current-A</input>
   <input>electrical/lamps/flight-deck/mail-current-A[0]</input>
   <input>electrical/lamps/flight-deck/mail-current-A[1]</input>
   <input>electrical/lamps/flight-deck/stowage-current-A</input>
  </summer>

 </channel>

 <!-- ======================================================================
      Main switchbox switch 6 fuse 12 and 13 circuits - Navigation lights
 -->
 <channel name="Navigation lights">

  <switch name="electrical/main-switchbox/switch-voltage-V[5]">
   <default value="0.0"/>
   <test logic="AND" value="electrical/bus[0]/voltage-V">
     electrical/main-switchbox/switch-cmd-norm[5] GT 0.5
   </test>
  </switch>

  <fcs_function name="electrical/lamps/navigation/port-current-A">
   <function>
    <product>
     <property>electrical/main-switchbox/fuse-serviceable[11]</property>
     <quotient>
      <property>electrical/main-switchbox/switch-voltage-V[5]</property>
      <value>28.8</value>
     </quotient>
    </product>
   </function>
  </fcs_function>
  <fcs_function name="electrical/lamps/navigation/port-power-W">
   <function>
    <product>
     <property>electrical/main-switchbox/switch-voltage-V[5]</property>
     <property>electrical/lamps/navigation/port-current-A</property>
    </product>
   </function>
   <output>/systems/electrical/lamps/navigation/port-power-W</output>
  </fcs_function>

  <fcs_function name="electrical/lamps/navigation/starboard-current-A">
   <function>
    <product>
     <property>electrical/main-switchbox/fuse-serviceable[12]</property>
     <quotient>
      <property>electrical/main-switchbox/switch-voltage-V[5]</property>
      <value>28.8</value>
     </quotient>
    </product>
   </function>
  </fcs_function>
  <fcs_function name="electrical/lamps/navigation/starboard-power-W">
   <function>
    <product>
     <property>electrical/main-switchbox/switch-voltage-V[5]</property>
     <property>electrical/lamps/navigation/starboard-current-A</property>
    </product>
   </function>
   <output>/systems/electrical/lamps/navigation/starboard-power-W</output>
  </fcs_function>

  <fcs_function name="electrical/lamps/navigation/tail-current-A">
   <function>
    <product>
     <property>electrical/main-switchbox/fuse-serviceable[12]</property>
     <quotient>
      <property>electrical/main-switchbox/switch-voltage-V[5]</property>
      <value>57.6</value>
     </quotient>
    </product>
   </function>
  </fcs_function>
  <fcs_function name="electrical/lamps/navigation/tail-power-W">
   <function>
    <product>
     <property>electrical/main-switchbox/switch-voltage-V[5]</property>
     <property>electrical/lamps/navigation/tail-current-A</property>
    </product>
   </function>
   <output>/systems/electrical/lamps/navigation/tail-power-W</output>
  </fcs_function>

  <summer name="electrical/main-switchbox/fuse-current-A[11]">
   <input>electrical/lamps/navigation/port-current-A</input>
  </summer>

  <summer name="electrical/main-switchbox/fuse-current-A[12]">
   <input>electrical/lamps/navigation/starboard-current-A</input>
   <input>electrical/lamps/navigation/tail-current-A</input>
  </summer>

 </channel>

 <!-- ======================================================================
      Main switchbox fuse 14 circuit - Signalling light
 -->
 <channel name="Main switchbox fuse 14">

  <fcs_function name="electrical/main-switchbox/fuse-voltage-V[13]">
   <function>
    <product>
     <property>electrical/main-switchbox/fuse-serviceable[13]</property>
     <property>electrical/bus[1]/voltage-V</property>
    </product>
   </function>
  </fcs_function>

  <!-- summer name="electrical/main-switchbox/fuse-current-A[13]">
  </summer -->

 </channel>


 <!-- ======================================================================
      Landing search lights
 -->
 <channel name="Landing lights">

  <switch name="electrical/light-switch-panel/landing-voltage-V[0]">
   <default value="0.0"/>
   <test logic="AND" value="electrical/bus[0]/voltage-V">
     electrical/light-switch-panel/landing-cmd-norm GT 0.25
     electrical/light-switch-panel/landing-cmd-norm LT 0.75
   </test>
  </switch>

  <switch name="electrical/light-switch-panel/landing-voltage-V[1]">
   <default value="0.0"/>
   <test logic="AND" value="electrical/bus[0]/voltage-V">
     electrical/light-switch-panel/landing-cmd-norm GT 0.75
   </test>
  </switch>

  <fcs_function name="electrical/lamps/landing/bow-current-A">
   <function>
    <product>
     <quotient>
      <property>electrical/light-switch-panel/landing-voltage-V[0]</property>
      <value>2.4</value>
     </quotient>
    </product>
   </function>
  </fcs_function>

  <fcs_function name="electrical/lamps/landing/wing-current-A">
   <function>
    <product>
     <quotient>
      <property>electrical/light-switch-panel/landing-voltage-V[1]</property>
      <value>1.152</value>
     </quotient>
    </product>
   </function>
  </fcs_function>

  <fcs_function name="electrical/lamps/landing/bow-power-W">
   <function>
    <product>
     <property>electrical/light-switch-panel/landing-voltage-V[0]</property>
     <property>electrical/lamps/landing/bow-current-A</property>
    </product>
   </function>
   <output>/systems/electrical/lamps/landing/bow-power-W</output>
  </fcs_function>

  <fcs_function name="electrical/lamps/landing/wing-power-W">
   <function>
    <product>
     <property>electrical/light-switch-panel/landing-voltage-V[1]</property>
     <property>electrical/lamps/landing/wing-current-A</property>
    </product>
   </function>
   <output>/systems/electrical/lamps/landing/wing-power-W</output>
  </fcs_function>

 </channel>

 <!-- ======================================================================
      Engine starters.

      See also the engine file, Engines/eng_PegasusXc.xml, and
      Systems/engines.xml

      Input to the engine starter
        propulsion/engine[#]/starter-voltage-V
      Output from the engine starter:
        propulsion/engine[#]/starter-current-A

 -->
 <channel name="Engine starters">

  <switch name="propulsion/engine[0]/starter-voltage-V">
   <default value="0.0"/>
   <test logic="AND" value="electrical/bus[1]/voltage-V">
     fcs/starter-cmd-norm[0] GT 0.5
   </test>
  </switch>
  <switch name="propulsion/engine[1]/starter-voltage-V">
   <default value="0.0"/>
   <test logic="AND" value="electrical/bus[1]/voltage-V">
     fcs/starter-cmd-norm[1] GT 0.5
   </test>
  </switch>
  <switch name="propulsion/engine[2]/starter-voltage-V">
   <default value="0.0"/>
   <test logic="AND" value="electrical/bus[1]/voltage-V">
     fcs/starter-cmd-norm[2] GT 0.5
   </test>
  </switch>
  <switch name="propulsion/engine[3]/starter-voltage-V">
   <default value="0.0"/>
   <test logic="AND" value="electrical/bus[1]/voltage-V">
     fcs/starter-cmd-norm[3] GT 0.5
   </test>
  </switch>

 </channel>

 <!-- ======================================================================
      Flap motor system.
      See also System/flaps.xml
 -->
 <channel name="Flaps">

  <fcs_function name="electrical/fuses/flap-motor-voltage-V">
   <function>
    <property>electrical/bus[0]/voltage-V</property>
   </function>
  </fcs_function>

 </channel>

 <channel name="Bus currents">

  <!-- The 24V bus. -->
  <summer name="electrical/bus[0]/current-A">
   <input>electrical/main-switchbox/fuse-current-A[2]</input>
   <input>electrical/main-switchbox/fuse-current-A[3]</input>
   <!-- input>electrical/main-switchbox/fuse-current-A[4]</input -->
   <input>electrical/main-switchbox/fuse-current-A[5]</input>
   <!-- input>electrical/main-switchbox/fuse-current-A[6]</input -->
   <!-- input>electrical/main-switchbox/fuse-current-A[7]</input -->
   <input>electrical/main-switchbox/fuse-current-A[8]</input>
   <!-- input>electrical/main-switchbox/fuse-current-A[9]</input -->
   <!-- input>electrical/main-switchbox/fuse-current-A[10]</input -->
   <input>electrical/main-switchbox/fuse-current-A[11]</input>
   <input>electrical/main-switchbox/fuse-current-A[12]</input>
   <input>electrical/flap-motor/current-A</input>
   <input>electrical/lamps/flaps/pilot-current-A</input>
   <input>electrical/lamps/flaps/warning-current-A</input>
   <input>electrical/lamps/landing/bow-current-A</input>
   <input>electrical/lamps/landing/wing-current-A</input>
  </summer>

  <!-- The 12V bus. -->
  <summer name="electrical/bus[1]/current-A">
   <input>propulsion/engine[0]/starter-current-A</input>
   <input>propulsion/engine[1]/starter-current-A</input>
   <input>propulsion/engine[2]/starter-current-A</input>
   <input>propulsion/engine[3]/starter-current-A</input>
   <input>electrical/main-switchbox/fuse-current-A[0]</input>
   <input>electrical/main-switchbox/fuse-current-A[1]</input>
   <!-- input>electrical/main-switchbox/fuse-current-A[13]</input -->
   <output>electrical/battery/current-A[1]</output>
  </summer>

 </channel>

 <!-- ======================================================================
      Generators and voltage regulators
 -->
 <channel name="Voltage regulators">

  <switch name="electrical/voltage-regulators/online[0]">
   <default value="0.0"/>
   <test logic="AND" value="1.0">
     propulsion/engine[1]/generator-voltage-V GT 20.0
     propulsion/engine[1]/generator-voltage-V GE electrical/bus[0]/voltage-V
   </test>
  </switch>

  <switch name="electrical/voltage-regulators/online[1]">
   <default value="0.0"/>
   <test logic="AND" value="1.0">
     propulsion/engine[2]/generator-voltage-V GT 20.0
     propulsion/engine[2]/generator-voltage-V GE electrical/bus[0]/voltage-V
   </test>
  </switch>

  <fcs_function name="electrical/voltage-regulators/current-available-A">
   <function>
    <sum>
     <product>
      <property>electrical/voltage-regulators/online[0]</property>
      <property>propulsion/engine[1]/generator-max-current-A</property>
     </product>
     <product>
      <property>electrical/voltage-regulators/online[1]</property>
      <property>propulsion/engine[2]/generator-max-current-A</property>
     </product>
    </sum>
   </function>
  </fcs_function>

  <fcs_function name="electrical/voltage-regulators/battery-current-A">
   <function>
    <sum>
     <!-- Charging. -->
     <product>
      <value>-0.01</value> <!-- Reverse current when charging. -->
      <lt>
       <property>electrical/bus[0]/current-A</property>
       <property>electrical/voltage-regulators/current-available-A</property>
      </lt>
      <max>
       <value>0.1</value> <!-- Trickle charge. -->
       <quotient>
        <difference>
         <property>electrical/bus[0]/voltage-V</property>
         <property>electrical/battery/open-circuit-voltage-V</property>
        </difference>
        <property>electrical/battery/internal-resistance-ohm</property>
       </quotient>
      </max>
     </product>
     <!-- No charging. -->
     <product>
      <ge>
       <property>electrical/bus[0]/current-A</property>
       <property>electrical/voltage-regulators/current-available-A</property>
      </ge>
      <difference>
       <property>electrical/bus[0]/current-A</property>
       <property>electrical/voltage-regulators/current-available-A</property>
      </difference>
     </product>
    </sum>
   </function>
   <output>electrical/battery/current-A[0]</output>
  </fcs_function>

  <fcs_function name="electrical/voltage-regulators/current-A[0]">
   <function>
    <product>
     <property>electrical/voltage-regulators/online[0]</property>
     <difference>
      <property>electrical/bus[0]/current-A</property>
      <property>electrical/voltage-regulators/battery-current-A</property>
     </difference>
     <difference>
      <value>1.0</value>
      <product>
       <value>0.5</value>
       <property>electrical/voltage-regulators/online[1]</property>
      </product>
     </difference>
    </product>
   </function>
  </fcs_function>

  <fcs_function name="electrical/voltage-regulators/current-A[1]">
   <function>
    <product>
     <property>electrical/voltage-regulators/online[1]</property>
     <difference>
      <property>electrical/bus[0]/current-A</property>
      <property>electrical/voltage-regulators/battery-current-A</property>
     </difference>
     <difference>
      <value>1.0</value>
      <product>
       <value>0.5</value>
       <property>electrical/voltage-regulators/online[0]</property>
      </product>
     </difference>
    </product>
   </function>
  </fcs_function>

 </channel>

</system>