4. Fault Isolation
_______________
A. If the circuit breaker 11CA1 is closed and if the MCDU MENU page is not in view on the MCDU 1:
- do a check for 115VAC at MCDU 1 (3CA1).
(1) If there is 115VAC:
- replace the MCDU-1 (3CA1), (Ref. AMM TASK 22-82-12-000-001) and (Ref. AMM TASK 22-82-12-400-002).
(2) If there is no 115VAC:
- do a check of the wiring of the 115VAC signal from the circuit breaker 11CA1 to the MCDU 1 (3CA1)
- do a check of the wiring of the ground signal at MCDU 1 (3CA1) pin A/41. (Ref. ASM 22-84/02).
(a) If there is no continuity:
- repair the above wirings.
(b) If there is continuity:
- replace the C/B-AUTO FLT/MCDU/1 (11CA1).
B. If the circuit breaker 11CA1 is open:
- close the circuit breaker.
(1) If the circuit breaker is open again:
- replace the MCDU-1 (3CA1), (Ref. AMM TASK 22-82-12-000-001) and (Ref. AMM TASK 22-82-12-400-002).
(a) If the fault continues:
- do a check for a short to ground between the circuit breaker (11CA1) to the MCDU 1 (3CA1) (Ref. ASM 22-84/02).
1_ If there is a short to ground:
- repair the above wiring.
2_ If there is no short to ground:
- replace the C/B-AUTO FLT/MCDU/1 (11CA1).
C. Do the test given in Para. 3.
Failure of the MCDU 1
1. Possible Causes
_______________
- MCDU-1 (3CA1)
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 22-82-12-000-001 Removal of the MCDU (3CA1,3CA2,3CA3) AMM 22-82-12-400-002 Installation of the MCDU (3CA1,3CA2,3CA3) AMM 22-91-00-710-001 Ground Scanning of the AFS
3. Fault Confirmation
__________________
A. Test
(1) Do the Ground Scanning of the AFS (Ref. AMM TASK 22-91-00-710-001).
4. Fault Isolation
_______________
A. If the test gives the maintenance message AFS: MCDU1:
- replace the MCDU-1 (3CA1), (Ref. AMM TASK 22-82-12-000-001) and (Ref. AMM TASK 22-82-12-400-002).
B. Do the test given in Para. 3.
MCDU 1 Inoperative
1. Possible Causes
_______________
- MCDU-1 (3CA1)
- wiring of the MCDU TRANSMITTER bus from the MCDU 1 (3CA1) to the first terminal block
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 22-82-12-000-001 Removal of the MCDU (3CA1,3CA2,3CA3)
AMM 22-82-12-400-002 Installation of the MCDU (3CA1,3CA2,3CA3)
AMM 22-91-00-710-001 Ground Scanning of the AFS
ASM 22-86/04
3. Fault Confirmation
__________________
A. Test
(1) Do the Ground Scanning of the AFS (Ref. AMM TASK 22-91-00-710-001).
4. Fault Isolation
_______________
A. If the test gives the maintenance message AFS: MCDU1:
- replace the MCDU-1 (3CA1), (Ref. AMM TASK 22-82-12-000-001) and (Ref. AMM TASK 22-82-12-400-002).
(1) If the fault continues:
- do a check and repair the wiring of the MCDU TRANSMITTER bus from the MCDU 1 (3CA1) to the first terminal block, (Ref. ASM 22-86/04).
B. Do the test given in Para. 3.
Loss of the Reception of the MCDU 1 TRANSMITTER Bus by one FMGC
1. Possible Causes
_______________
- FMGC-1 (1CA1)
- FMGC-2 (1CA2)
- wiring of the MCDU OWN IN bus (from the FMGC 1 (1CA1) to the first
terminal block)
- wiring of the MCDU OPP IN bus (from the FMGC 2 (1CA2) to the first
terminal block)
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
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本文鏈接地址：A320 Trouble Shooting Manual 排故手冊 AUTO FLIGHT 自動飛行2(48)
