AWO.A.EFVS.105 CS AWO.A.EFVS.105 Head-up display enhanced flight vision system (HUD EFVS) symbology

- (a) In addition to sensor imagery, the flight instrument data that is displayed on the HUD (or equivalent display) shall, as a minimum, include: - (1) airspeed, - (2) vertical speed, - (3) aircraft attitude, - (4) heading, - (5) altitude, - (6) command guidance as appropriate for the approach to be flown, - (7) path deviation indications, - (8) FPV, and - (9) FPARC. - (b) A means shall be provided within the HUD (or equivalent display) on the approach to: - (1) enable a consistency check with the EFVS imagery and other flight information; - (2) increase awareness of the runway environment and its emergent location; and - (3) enable the expected location on the HUD (or equivalent display) of the approach and threshold lights to be identified during the particular types of approach for which certification is requested.

Such means must not be misleading, must not cause pilot confusion nor increase pilot workload, and must not occlude the emerging EFVS cues.

- (c) EFVS-L that is intended to be used from the DA/H through touchdown and roll-out at not less than 300 m (1 000 ft) RVR shall also display: - (1) height AGL such as that provided by the use of a radio altimeter or other device capable of providing equivalent performance and integrity level; and - (2) a flare prompt or flare guidance for achieving acceptable touchdown performance. - (d) The appearance and dynamic behaviour of the EFVS-L flare prompt shall be distinct from any command guidance and shall appear in a timely and conspicuous manner to the pilot. - (e) An FPV shall be provided on the same display as the EFVS imagery and shall provide a position and motion that corresponds to the aircraft's earth -referenced FPV, and shall dynamically respond to follow the pilot control inputs. - (f) The dynamic response of the FPV symbol to pilot control inputs shall not exhibit undue lag or overshoot. - (g) An FPARC shall be provided on the same display as the EFVS imagery that is suitable for monitoring the vertical path of the aircraft. A means shall be provided to permit the pilot to select the desired descent angle that is represented by the FPARC. It is also possible for the descent angle to be provided automatically from a database.

Easy Access Rules for All-Weather Operations (CS-AWO)

- (h) The display of attitude symbology, FPV, FPARC, and other visual elements which are earth referenced, shall be aligned with, scaled and conformal to the external view. - (i) The EFVS display of imagery, flight information and flight symbology shall provide suitable visual reference for the pilot during the manual performance of any manoeuvres within the operating limitations of the aircraft, including taxiing, take-off, approach, landing and roll-out, as applicable for the intended function.

[Issue: CS-AWO/2]