1. Possible Causes
_______________
 - FMGC-2 (1CA2)

 - wiring of the AP INST DISC NO discrete (from the FMGC 2 (1CA2) to the takeover and priority relay (47CE2))

 - wiring of the GND FILTERED discrete (from the FMGC 2 (1CA2) to the
 takeover and priority relay (47CE2))

 - RELAY-TAKEOVER & PRIORITY 2 (47CE2)

 - wiring of the AP INST DISC NC discrete (from the FMGC 2 (1CA2) to the takeover and priority relay (47CE2))

 - wiring of the takeover and priority relay (47CE2)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 22-83-34-000-001 Removal of the FMGC (1CA1,1CA2)
 AMM 22-83-34-400-001 Installation of the FMGC (1CA1,1CA2)
 AMM 22-96-00-710-001 Operational Test of the AFS
 ASM 22-85/03

 3. Fault Confirmation
__________________
 A. Test
 (1) On the FCU, make sure that the two AP pushbutton switches are pushed.

 (2) Do the operational tests of the AFS (Ref. AMM TASK 22-96-00-710-001) and read the result for the FMGC 2:

 (a) With one takeover and priority pushbutton switch pushed (on side stick).

 (b) With the two takeover and priority pushbutton switches released.

 4. Fault Isolation
_______________

 A. If only the first test gives the maintenance message AFS: FMGC2/TAKE OV CKT:
 - replace the FMGC-2 (1CA2), (Ref. AMM TASK 22-83-34-000-001) and (Ref. AMM TASK 22-83-34-400-001).
 (1) If the fault continues:
 - do a check of the wiring of the AP INST DISC NO discrete (from the FMGC 2 (1CA2) to the takeover and priority relay (47CE2)) (Ref. ASM 22-85/03).
 (a) If there is no continuity:

 - repair the above wiring.

 (b) If there is continuity:

 - do a check of the wiring of the GND FILTERED discrete (from the FMGC 2 (1CA2) to the takeover and priority relay (47CE2)) (Ref. ASM 22-85/03).
 1 If there is no continuity:
_ - repair the above wiring.
 2 If there is continuity:
_
 - replace the RELAY-TAKEOVER & PRIORITY 2 (47CE2).
 B. If only the second test gives the maintenance message AFS: FMGC2/TAKE OV CKT:
 - replace the FMGC-2 (1CA2), (Ref. AMM TASK 22-83-34-000-001) and (Ref. AMM TASK 22-83-34-400-001).
 (1) If the fault continues:
 - do a check of the wiring of the AP INST DISC NC discrete (from the FMGC 2 (1CA2) to the takeover and priority relay (47CE2)) (Ref. ASM 22-85/03).
 (a) If there is no continuity:

 - repair the above wiring.

 (b) If there is continuity:

 - do a check of the wiring of the takeover and priority relay (47CE2) (from 47CE2 pin A/D to the first terminal block) (Ref. ASM 22-85/03).
 1 If there is no continuity:
_ - repair the above wiring.
 2 If there is continuity:
_
 - replace the RELAY-TAKEOVER & PRIORITY 2 (47CE2).
 C. Do the tests given in Para. 3.
 「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 ∞∞22-83-00∞∞∞∞∞∞∞∞∞∞Page 210
 Feb 01/98 CES

 Loss of the Parity Pin Program on the FMGC 1
 1. Possible Causes_______________
 - FMGC-1 (1CA1) - wiring of the ground signal at the programming pins of the FMGC 1 (1CA1)
 2. Job Set-up Information______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
R R  AMM AMM AMM AWM AWM  22-83-34-000-001 22-83-34-400-001 22-96-00-710-001 22-85-30 22-85-31 Removal of the FMGC (1CA1,1CA2)Installation of the FMGC (1CA1,1CA2)Operational Test of the AFS 
3. Fault Confirmation__________________
 A. Test
 (1) Do the operational test of the AFS (Ref. AMM TASK 22-96-00-710-001) and read the result for the FMGC 1.
 4. Fault Isolation_______________
 A. If the test gives the maintenance message AFS: FMGC1/PARITY PIN PRG: - replace the FMGC-1 (1CA1), (Ref. AMM TASK 22-83-34-000-001) and (Ref. AMM TASK 22-83-34-400-001).
R R R  (1) If the fault continues: - do a check and repair the wiring of the ground signal at the programming pins of the FMGC 1 (1CA1), (Ref. AWM 22-85-30) and (Ref. AWM 22-85-31).
　
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