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
CAT IIIB DH No DH or DH < 50 ft No DH or DH < 50 ft No DH or DH < 50 ft
 RVR 50 m ≤ RVR < 200 m
150 ft ≤ RVR < 700 ft 50 m ≤ RVR < 200 m
150 ft ≤ RVR < 700 ft 75 m ≤ RVR < 200 m
250 ft ≤ RVR < 700 ft

(1) DH ≥ 50 ft if fail passive
FLIGHT PREPARATION
Applicable to: ALL
In addition to the normal flight preparation, the following preparation must be performed when CAT II or CAT III approach is planned:
? Ensure that destination airport meets CAT II or CAT III requirements
? Check aircraft required equipment for CAT II or CAT III in QRH
? Check that crew qualification is current
? Consider extra fuel for possible approach delay
? Consider weather at alternate
APPROACH PREPARATION
Applicable to: ALL
LIMITATIONS
? The crew will check that tower wind remains within the limit for CAT II or CAT III approaches (Refer to FCOM/LIM-22-20 MAXIMUM WIND CONDITIONS FOR CAT II OR CAT III AUTOMATIC APPROACH LANDING AND ROLL OUT)
? The autoland maximum altitude must be observed.
 

  NORMAL OPERATIONS
PRECISION APPROACH
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL 

AIRCRAFT CAPABILITY
The failures that may affect the aircraft's CAT II or CAT III capability are listed in the QRH. Most of these failures are monitored by the FMGS and the landing capability will be displayed on the FMA
once the APPR pb is pressed, i.e. CAT II, CAT III SINGLE, CAT III DUAL. However, there are a number of failures which affect the aircraft's landing capability which are not monitored by the FMGS and, consequently, not reflected on the FMA. It is very important, therefore, that the crew refer to the QRH to establish the actual landing capability if some equipment are listed inoperative.
　
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