AWO.A.HUD.114 CS AWO.A.HUD.114 Assessment of the failure conditions relating to the use of flare cues

- (a) For the purpose of the failure assessment of the flare cue in the context of CS 25.1309, it may be necessary to use a simulator with an acceptable visual system, which accurately represents the real aeroplane, in particular the handling qualities, the ground effect, the fog structure, and the cut-off angle (i.e. the angle between the longitudinal axis of the aircraft and an incline plane below up to the limit at which the pilot can view). - (b) The failure assessment of the flare cue should take into account at least the following nominal environmental conditions: - (1) minimum visibility / RVR of the operation intended to be certified (e.g. RVR 550m for CAT I,

- RVR 300m for EFVS-L); - (2) day and night conditions; - (3) runways with different length and width; - (4) runways with different lighting layout (e.g. no centre line lights, no TDZ lights, etc.). - (c) As flare cue failures are expected to be detected by the flight crew using visual cues, a multiple representative population range of flight crews should be involved in the failure assessment of the flare cue in the simulator.

[Issue: CS-AWO/2]

SECTION 3 -ENHANCED FLIGHT VISION SYSTEMS (EFVSS)