BDD Example

Feature: Mode 1 - Excessive Rate of Descent

The Mode 1 alert is intended to generate caution alerts and time-critical warning alerts when the aircraft has a high rate of descent relative to its height above terrain. Mode 1 is active during all segments of flight. In order to reduce nuisance alerts during steep approaches, an optional set of alerting curves may be employed when the aircraft is performing a steep approach. The determination if a steep approach is in progress can either be based on an input to the Equipment (such as a pilot-activated steep approach switch) or it can be based on internal logic (such as comparison of aircraft position to approach profiles in a database).

  Scenario Outline: Must Alert

    Given Mode 1 is armed
    And Mode 1 is not inhibited
    And steep approach is selected
    When the rate of descent is at least <rate of descent> feet per minute
    And the height above terrain is between 150 and <height> feet
    Then a Mode 1 warning alert is emitted within 2 seconds

    Examples:

rate of descent	height
1909	150
2050	300
10100	1958