W DOC AIRBUS | TSM A320F

Loss of the 3rd OCCPNT ACP Emergency Function for the F/O ACP

TASK 23-51-00-810-843-A
Loss of the 3rd OCCPNT ACP Emergency Function for the F/O ACP

1. Possible Causes
  • AMU [1RN]
  • SEL SW-AUDIO SWITCHING [16RN]
  • wiring
  • RELAY-SUPLY TRANSFER [68RN]
  • C/B-COM NAV/ACP/THIRD/OCCPNT [6RN]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
ESPM 2046500
AMM 23-51-00-710-003
Operational Test of the CAPT and F/O ACPs Switching to the 3rd OCCUPANT ACP
ASM 235104
AIPC 235108
AMM 23-51-34-000-001
Removal of the Audio Management Unit (AMU) (1RN)
AMM 23-51-34-400-001
Installation of the Audio Management Unit (AMU) (1RN)
3. Fault Confirmation
Subtask 23-51-00-710-090-A
A. Test
   (1) Do the operational test of the First Officer ACP switching to the Third Occupant ACP AMM 23-51-00-710-003.
NOTE: Do this test for the First Officer station only.
4. Fault Isolation
Subtask 23-51-00-810-092-A ** ON A/C NOT FOR ALL
A. If the First Officer ACP switching to the Third Occupant ACP is inoperative:
   (1) If the fault continues:
     (a) If the fault continues:
  • Do a check for a ground signal at pin 13 of the SEL SW-AUDIO SWITCHING [16RN] ASM 235104.
       1 If there is no ground signal:
  • Repair the wiring between the SEL SW-AUDIO SWITCHING [16RN] and the ground terminal ASM 235104.
       2 If there is a ground signal:
  • Do a check and repair the wiring from the SEL SW-AUDIO SWITCHING [16RN] pin 16 to the AMU [1RN] pin AA/15K ASM 235104.
Subtask 23-51-00-810-092-B ** ON A/C NOT FOR ALL
A. If the First Officer ACP switching to the Third Occupant ACP is inoperative:
   (1) If the fault continues:
   (2) If the fault continues:
   (3) If the fault continues:
  • Do a check for a ground signal at pin 13 of the SEL SW-AUDIO SWITCHING [16RN] ASM 235104.
     (a) If there is no ground signal:
  • Repair the wiring between the SEL SW-AUDIO SWITCHING [16RN] pin 13 and the ground terminal ASM 235104.
     (b) If there is a ground signal:
  • Do a check and repair the wiring between the SEL SW-AUDIO SWITCHING [16RN] pin 16 and the AMU [1RN] pin AA/15K ASM 235104.
   (4) If the fault continues:
  • Do a check for a ground signal at pin 9 of the SEL SW-AUDIO SWITCHING [16RN] ASM 235104.
     (a) If there is no ground signal:
  • Repair the wiring between the SEL SW-AUDIO SWITCHING [16RN] pin 9 and the ground terminal ASM 235104.
     (b) If there is a ground signal:
  • Do a check and repair the wiring between the SEL SW-AUDIO SWITCHING [16RN] pin 12 and the RELAY-SUPLY TRANSFER [68RN] pin A/X2 ASM 235104.
   (5) If the fault continues:
  • Do a check and repair the wiring from:
    . The RELAY-SUPLY TRANSFER [68RN] pin A/B1 to the C/B C/B-COM NAV/ACP/THIRD/OCCPNT [6RN]
    . The RELAY-SUPLY TRANSFER [68RN] pin A/X1 to the C/B C/B-COM NAV/ACP/THIRD/OCCPNT [6RN]
Subtask 23-51-00-710-091-A
B. Do the test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:25:46 UTC
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