getting to grips with CAT II CAT III operations(29)

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A reliability program should be developed/extended to monitor, track and control theCAT III operational status of the aircraft and to achieve at least 95% successful CAT III landings in real and/or simulated conditions.
3.5.3 MAINTENANCE PROCEDURE
A specific procedure should be established to govern the capability of the aircraft to conduct CAT III operations in the following conditions:
-
 Operational:

.  
Impossible to obtain (or loss of ) CAT 3 capability
(AMM 22 13 00),

.  
Missed approach (illumination of the red AUTOLAND
warning light) .

 

-
 Maintenance

.  
Confirmed defect with corrective action carried out,

.  
Unconfirmed defect but with corrective action,

.  
Aircraft dispatch under MEL conditions,

.  
Unable to correct defect and not under MEL conditions,

.  
Unable to perform the required test.

 

Therefore, upgrading/downgrading procedure must be defined so as to assist the
dispatch of the aircraft to assure maximum autoland capacity.
The dispatch policy should be based on the minimum equipment list (MEL) as it
governs the basic criteria for operation.

Dispatch criteria and status of aircraft must be recorded in the Technical Log Book with reference to the MEL (if any); if the defect has been rectified it should be cleared accordingly and revalidation of the aircraft status performed.
A prominent placard should be displayed on the aircraft and in the maintenance control room to inform Flight Operations of the current aircraft status.
In general, aircraft which perform Cat III operation regularly under real or simulated conditions do not need to perform system checks except if specified in AMM.
After an adjustment or a repair is made on the equipment, a revalidation of the aircraft should be made by the corresponding AMM ground test.
A periodic check may be requested by national authorities on an aircraft, which hasnot performed CAT III operations for a specific period of time (to be agreed with national authorities).
3.5.4 LIST OF REQUIRED EQUIPMENT
The table below gives the reference of the tests, which verify the CAT III availability in each system. Refer to the AFM for the official list of required equipment.
A300 B2-B4 
AFM REQUIRED EQUIPMENT FOR CAT III DUAL  Equi. validity tested by 
"AUTOLAND" light  2  MPD 331500-0303-1 
ADC  2  AMM 221000 P501 
AP/FD  2 AP ENGAGED  AMM 221000 P501 
ATTITUDE INDICATION  n°1+n°2+STBY  AMM 221000 P501 
AUTOTHRUST  1  AMM 221000 P501 
BEAM EXCESSIVE DEVIATION  1  AMM 343601 P300 
COMPASS COUPLER  2  AMM 221000 P501 
　
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