Loss of the Standby AOA Output Discrete from the PHC 3

TASK 30-31-00-810-882-A
Loss of the Standby AOA Output Discrete from the PHC 3

1. Possible Causes

ADIRU-3 [1FP3]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 30-31-00-710-001	Operational Test of the Probe Ice Protection
AMM 34-12-34-000-001	Removal of the ADIRU
AMM 34-12-34-400-001	Installation of the ADIRU

3. Fault Confirmation
Subtask 30-31-00-710-196-A

A. Do the operational test of the probe ice protection of the PHC-3 AMM 30-31-00-710-001.

4. Fault Isolation
Subtask 30-31-00-810-137-A

A. If the test confirms the fault:
(1) Disconnect electrical connector A from PHC-3 and remove ADIRU-3.
(2) Do a check of the wiring between ASM 341302 pin A/Z of PHC-3 and pin AA/3J of ADIRU-3.
(a) If there is no continuity:
1 Repair the wiring.
2 Connect electrical connector A to PHC-3.
3 Install ADIRU-3.
(b) If there is continuity:
1 Replace ADIRU-3 [1FP3] , AMM 34-12-34-000-001 and AMM 34-12-34-400-001.

Subtask 30-31-00-710-206-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:29:40 UTC