AWO.B.CATIII.120 CS AWO.B.CATIII.120 Indications and alerts

(See AMC1 AWO.B.CATIII.121 and AMC AWO.A.ALS.110)

- (a) The display of information to the flight crew, including that required to monitor the approach, flare and ground roll shall be compatible with the procedures specified in the AFM or flight crew operating manual as appropriate and with normal flight crew tasks. - (b) Any malfunction of the landing system or of the xLS facility which requires a missed approach shall be positively and unambiguously annunciated to each pilot, so that pilot action may be initiated promptly without further interpretation. (See AMC 25.1322) - (c) Notwithstanding (a) and (b), for fail-operational systems, failure warnings may be inhibited below alert height if: - (1) the failure does not preclude continuation of an automatic landing; and - (2) the failure requires no specific action by the flight crew; and - (3) Information on the occurrence of any failure warnings so inhibited is subsequently available to flight and maintenance crews. - (d) Where the capability of the aeroplane is dependent on equipment serviceability and modes selected, means shall be provided whereby the pilot can readily determine the capability at alert height (e.g. fail-operational status, ground-roll availability).

[Issue: CS-AWO/2]

ED Decision 2022/007/R

- 1 Failures

- 1.1 Indications and alerts

Failure indications and alerts should be demonstrated. (See AMC 25.1309)

- 1.2 Effects

For compliance with CS 25.1309, the effects of failure conditions will need to be demonstrated including not only failures of the landing system but also failures in other aeroplane equipment which could affect the landing (e.g. engines, reverse thrust, nose-wheel steering) and failures in the xLS ground facility. Although this demonstration may be done primarily by using a ground simulation, some cases should also be demonstrated in flight to confirm the conclusions of the simulation. (See AMC 25.1309)

- 2 Crew errors

Individual landings additional to those of AMC AWO.A.ALS.106 paragraph 2.1 should be carried out to demonstrate that errors, which can reasonably be expected to occur, are not hazardous (e.g. asymmetric braking or reverse thrust, incorrect approach speed). (See AMC AWO.A.ALS.106 paragraph 2.2)

[Issue: CS-AWO/2]