W DOC AIRBUS | TSM A320F

Loss of the 26VAC Power Supply of the ADIRU 3

TASK 34-11-00-810-803-A
Loss of the 26VAC Power Supply of the ADIRU 3

1. Possible Causes
  • ADIRU-3 [1FP3]
  • wiring
  • C/B-ADIRS/ADIRU/3/26VAC AND AOA [5FP3]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
ASM 341101
AMM 34-12-34-000-001
Removal of the ADIRU
AMM 34-12-34-400-001
Installation of the ADIRU
AMM 34-13-00-740-002
INTERFACE TEST of the ADR
3. Fault Confirmation
Subtask 34-11-00-865-052-A
A. Table of the circuit breakers used in this procedure:
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
121VUADIRS/ADIRU/3/26VAC AND AOA5FP3N07
Subtask 34-11-00-740-054-A
B. Test
   (1) Do the Interface test of the ADR (system 3) AMM 34-13-00-740-002.
     (a) If you cannot close the circuit breaker (5FP3), go to Para. 4.A.(2).
4. Fault Isolation
Subtask 34-11-00-810-052-B
A. If the test gives the maintenance message AOA SENSOR3 (3FP3) SPLY:
   (1) If the circuit breaker (5FP3) is closed:
  • do a check for 26VAC at pins AC/10, 6 of the ADIRU 3 (1FP3).
     (a) If there is 26VAC:
     (b) If there is no 26VAC:
  • do a check for a ground signal at pins AC/4, 9 of the ADIRU 3 (1FP3).
       1 If there is no ground signal:
  • repair the wiring between ADIRU 3 pins AC/4, 9 and the ground terminal ASM 341101.
       2 If there is a ground signal:
  • do a check of the wiring between ADIRU 3 pins AC/10, 6 and the circuit breaker (5FP3) ASM 341101.
         a If there is no continuity:
  • repair the above wiring.
         b If there is continuity:
  • replace the C/B-ADIRS/ADIRU/3/26VAC AND AOA [5FP3] .
   (2) If the circuit breaker (5FP3) is open:
  • close the circuit breaker.
     (a) If the circuit breaker trips:
       1 If the fault continues:
  • do a check for a short to ground at the wiring between ADIRU 3 pins AC/10, 6 and the circuit breaker (5FP3) ASM 341101.
         a If there is a short to ground:
  • repair the above wiring.
         b If there is no short to ground:
  • replace the C/B-ADIRS/ADIRU/3/26VAC AND AOA [5FP3] .
Subtask 34-11-00-740-055-A
B. Do the test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:32:13 UTC
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