W DOC AIRBUS | TSM A320F

Electrical Controls of the First Officer Seat Inoperative

TASK 25-11-00-810-806-A
Electrical Controls of the First Officer Seat Inoperative

1. Possible Causes
  • circuit breaker in the First Officer seat (4MS)
  • horizontal-travel electrical-control switch
  • vertical-travel electrical-control switch
  • SEAT-F/O [4MS]
  • wiring between the First Officer seat (4MS) and the circuit breaker (1MS2)
  • C/B-COCKPIT SEATS/SEAT CTL/F/O [1MS2]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 25-11-00-710-001
Operational Test of the Captain and First Officer Seats
ASM 251101
AMM 25-11-51-000-001
Removal of the Captain/First Officer Seat
AMM 25-11-51-400-001
Installation of the Captain/First Officer Seat
AMM 25-11-69-000-001
Removal of the Captain (First Officer) Seat Pan and Base Accessories
AMM 25-11-69-400-001
Installation of the Captain (First Officer) Seat Pan and Base Accessories
3. Fault Confirmation
Subtask 25-11-00-710-056-A
A. Test
   (1) Do the operational test of the Captain and First Officer seats (3MS, 4MS) AMM 25-11-00-710-001.
NOTE: Do the test of the First Officer seat only.
4. Fault Isolation
Subtask 25-11-00-810-055-A
A. If during the operational test the First Officer seat electrical controls are inoperative:
  • do a check of the configuration of the circuit breaker (1MS2) on the panel 122VU.
   (1) If the circuit breaker is closed:
  • do a check for 115VAC at pins A-B-C of the First Officer seat (4MS) ASM 251101.
     (a) If there is 115VAC:
  • Do a visual check of the configuration of the circuit breaker in the First Officer seat (4MS),
       1 If the circuit breaker is open:
  • Close it.
       2 If it trips again:
         a If the fault continues:
     (b) If there is no 115VAC:
  • do a check for a ground signal at pin D of the First Officer seat (4MS) ASM 251101.
       1 If there is no ground signal:
  • repair the above wiring.
       2 If there is a ground signal:
  • do a check of the wiring between the First Officer seat (4MS) and the circuit breaker (1MS2) ASM 251101.
         a If there is no continuity:
  • repair the above wiring.
         b If there is continuity:
  • replace the C/B-COCKPIT SEATS/SEAT CTL/F/O [1MS2] .
   (2) If the circuit breaker is open:
  • close it.
     (a) If it trips again:
       1 If the fault continues:
  • do a check for a short to ground at the wiring between the First Officer seat (4MS) and the circuit breaker (1MS2) ASM 251101.
         a If there is a short to ground:
  • repair the above wiring.
         b If there is no short to ground:
  • replace the C/B-COCKPIT SEATS/SEAT CTL/F/O [1MS2] .
Subtask 25-11-00-710-057-A
B. Do the test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:26:59 UTC
"WTRUIB" 2025