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Hence,
? The automatic landing is required in CAT III operations including roll out in CAT IIIB.
? The automatic landing is the preferred landing technique in CAT II conditions
? Any failures of the automated systems shall not significantly affect the aircraft automatic landing system performance
? The crew procedures and task sharing allow to rapidly detect any anomaly and thus lead to the right decision
DEFINITION
Applicable to: ALL
DECISION HEIGHT
The Decision Height (DH) is the wheel height above the runway elevation by which a go around must be initiated unless appropriate visual reference has been established and the aircraft position and the approach path have been assessed as satisfactory to continue the automatic approach and landing safely. The DH is based on RA.
ALERT HEIGHT
The Alert Height (AH) is the height above the runway, based on the characteristics of the aeroplane and its fail-operational automatic landing system, above which a CAT III approach would be discontinued and a missed approach initiated if a failure occurred in one of the redundant parts of the automatic landing system, or in the relevant ground equipment.
In others AH definition, it is generally stated that if a failure affecting the fail-operational criteria occurs below the AH, it would be ignored and the approach continued (except if AUTOLAND warning is triggered). The AH concept is relevant when CAT3 DUAL is displayed on FMA.
For the A330 and A340, the AH = 200 ft.
CAT 3 SINGLE
CAT 3 SINGLE is announced when the airborne systems are fail passive which means that a single failure will lead to the AP disconnection without any significant out of trim condition or deviation of the flight path or attitude. Manual flight is then required. This minimum DH is 50 ft.
 
NORMAL OPERATIONS
PRECISION APPROACH
 
CAT 3 DUAL
CAT 3 DUAL is announced when the airborne systems are fail-operational. In case of a single failure, the AP will continue to guide the aircraft on the flight path and the automatic landing system will operate as a fail-passive system. In the event of a failure below the AH, the approach, flare and landing can be completed by the remaining part of the automatic system. In that case, no capability degradation is indicated. Such a redundancy allows CAT III operations with or without DH.
CAT II OR CAT III APPROACHES
 ICAO FAA JAA
CAT II DH 100 ft≤DH<200 ft 100 ft≤DH<200 ft 100 ft≤DH<200 ft
 RVR RVR ≥350 m
RVR≥1 200 ft 350 m≤RVR<800 m
1 200 ft≤RVR<2 400 ft RVR>≥300 m
RVR≥1 000 ft
CAT IIIA DH No DH or DH<100 ft No DH or DH<100 ft DH<100 ft(1)
 RVR RVR ≥200 m
RVR≥ 700 ft RVR ≥200 m
RVR≥ 700 ft RVR ≥200 m
RVR≥ 700 ft
　
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本文鏈接地址：A330/A340 機組訓練手冊 FCTM Flight Crew Training Manual 2(3)