3. Fault Confirmation
__________________
 A. Make sure that this(these) circuit breaker(s) is(are) closed:
 -------------------------------------------------------------------------------
PANEL DESIGNATION IDENT. LOCATION
 -------------------------------------------------------------------------------
121VU AUTO FLT/FCU/2 9CA2 M21
 B. Test
 (1) Do the Ground Scanning of the AFS (Ref. AMM TASK 22-91-00-710-001).
 (a) If the circuit breaker (9CA2) is open, refer to Para. 4.B. of this trouble shooting procedure.
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞22-81-00∞∞∞∞∞∞∞∞∞∞Page 205
 Feb 01/98 CES

 4. Fault Isolation
_______________

 A. If the circuit breaker (9CA2) is closed and if the test gives the
 maintenance message AFS: FCU:

 - do a check for 28VDC at the FCU (2CA) pin B/Z.
 (1) If there is 28VDC:
 - replace the FCU (2CA) (Ref. AMM TASK 22-81-12-000-001) and (Ref. AMM TASK 22-81-12-400-001).
 (a) If the fault continues:
 - do a check of the: . wiring of the FMGC 2 A bus from the FCU (2CA) to the first terminal block . wiring of the FCU OWN A bus from the FMGC 2 (1CA2) to the first terminal block . wiring of the FCU OWN B bus from the FMGC 2 (1CA2) to the first terminal block

 - (Ref. ASM 22-86/03).

 1 If there is no continuity:
_ - repair the above wirings.
 2 If there is continuity:
_
 - do a check and repair the wirings of the FCU 1 A F/B and FCU 1 B F/B buses from the FCU (2CA) to the first terminal block (Ref. ASM 22-86/03).
 (2) If there is no 28VDC:
 - do a check of the wiring of the 28VDC signal from the circuit breaker (9CA2) to the FCU (2CA) and the wiring of the ground signal at the FCU (2CA), pin B/A (Ref. ASM 22-84/01).
 (a) If there is no continuity:

 - repair the above wirings.

 (b) If there is continuity:

 - replace the C/B-AUTO FLT/FCU/2 (9CA2).
 B. If the circuit breaker (9CA2) is open:
 - close this circuit breaker.
 (1) If the circuit breaker trips:
 - replace the FCU (2CA) (Ref. AMM TASK 22-81-12-000-001) and (Ref. AMM TASK 22-81-12-400-001).
 (a) If the fault continues:
 - do a check for a short to ground from the circuit breaker (9CA2) to the FCU (2CA) (Ref. ASM 22-84/01).
 1 If there is a short to ground:
_ - repair the above wiring.
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞22-81-00∞∞∞∞∞∞∞∞∞∞Page 206
 Feb 01/98 CES

_
 - replace the C/B-AUTO FLT/FCU/2 (9CA2).
 C. Do the test given in Para. 3.

 Loss of the FCU 1 A Bus
 1. Possible Causes
_______________
 - FCU (2CA)

 - wiring of the FCU 1 A bus from the FCU (2CA) to the first terminal block

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 22-81-12-000-001 Removal of the FCU (2CA) AMM 22-81-12-400-001 Installation of the FCU (2CA) AMM 22-91-00-710-001 Ground Scanning of the AFS ASM 22-86/03
 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: FCU:
 - replace the FCU (2CA) (Ref. AMM TASK 22-81-12-000-001) and (Ref. AMM TASK 22-81-12-400-001).
 (1) If the fault continues:
 - do a check and repair the wiring of the FCU 1 A bus from the FCU (2CA) to the first terminal block (Ref. ASM 22-86/03).
 B. Do the test given in Para. 3.

 Loss of the FCU 1 B Bus
 1. Possible Causes
_______________
 - FCU (2CA)

 - wiring of the FCU 1 B bus from the FCU (2CA) to the first terminal block

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
　
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