CS
ACNS.E.TAWS.030 Terrain information display
ED Decision 2013/031/R
(See AMC1 ACNS.E.TAWS.030)
(a) When terrain information is provided it is clearly visible to the flight crew.
(b) Terrain information is displayed as follows:
(1) The terrain is depicted relative to the aeroplane’s position such that the pilot may estimate the relative bearing and distance to the terrain of interest.
(2) The terrain depicted is oriented in accordance with the orientation of the navigation information used on the flight deck.
(3) Variations in terrain elevation depicted relative to the aeroplane’s elevation (above and below) are visually distinguishable.
(4) Terrain that generates alerts is displayed in a manner to distinguish it from non-hazardous terrain, consistent with the caution and warning alert level.
(5) If the terrain is presented on a multi-function display, the terrain mode and terrain information is distinguishable from weather and other features.
(6) Terrain information is readily available and displayed with sufficient accuracy and in a manner to allow the flight crew to determine if it is a terrain threat to the aeroplane.
(c) The display of terrain data complements and is compatible with the terrain alerting function of the TAWS.
(d) The terrain information is clear and unambiguous, available without potential confusion during day and night operations under all ambient conditions expected in service.
(e) Where additional terrain views are provided, they must present information consistent and compatible with (a) to (e) above.
EASA aviation regulations mandate clear, accurate terrain display for pilots. Terrain must be visually distinguishable by elevation, relative to the aircraft, and oriented with navigation data. Hazardous terrain alerts must be distinct. The display should be unambiguous, readily available, and compatible with terrain awareness systems for safe flight operations.
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