Failure of the ADM Power Supply of the ADIRU3

TASK 34-11-00-810-885-A
Failure of the ADM Power Supply of the ADIRU3

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 34-11-17-000-001	Removal of the Air Data Module
AMM 34-11-17-400-001	Installation of the Air Data Module
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
ASM 341303

3. Fault Confirmation
Subtask 34-11-00-740-126-A ** ON A/C NOT FOR ALL

A. Test
Do the Interface test of the ADR (system 3) AMM 34-13-00-740-002.

4. Fault Isolation
Subtask 34-11-00-810-197-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message ADM3 (19FP3)/ ADM8 (19FP8):

remove the ADIRU-3 [1FP3] AMM 34-12-34-000-001
make sure that there is no continuity between pins AA/6G, 6H, between pins AA/6H, 6J and between pins AA/6G, 6J of the rack connector.

(1) If there is no continuity:

(2) If there is continuity:

get access to the ADM-STBY TOTAL PRESSURE [19FP3] AMM 34-11-17-000-001 (Para. 2.B.)
disconnect the electrical connector of the ADM3 and make sure that there is no continuity between pins A/A, C, between pins A/C, E and between pins A/A, E of the ADM3.

(a) If there is continuity:

(b) If there is no continuity:

get access to the ADM-STBY STATIC PRESSURE [19FP8] AMM 34-11-17-000-001 (Para. 2.B.)
disconnect the electrical connector of the ADM8 and make sure that there is no continuity between pins A/A, C, between pins A/C, E and between pins A/A, E of the ADM8.

1 If there is continuity:

2 If there is no continuity:

do a check and repair the aircraft wiring between ADIRU3 pins AA/6G, 6H, 6J and the related LRU ASM 341303
connect the electrical connector of the ADM
install the ADIRU3.

Subtask 34-11-00-740-127-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:32:18 UTC