Air Data Portion of the ADIRU3 Unserviceable

TASK 34-11-00-810-891-A
Air Data Portion of the ADIRU3 Unserviceable

1. Possible Causes

ADIRU-3 [1FP3]
ADM-STBY TOTAL PRESSURE [19FP3]
ADM-STBY STATIC PRESSURE [19FP8]
wiring between the ADIRU3 and the connector receptacle of the STBY total pressure ADM (19FP3)
wiring between the connector receptacle of the STBY static pressure ADM (19FP8) and the first terminal block

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
ASM 341303
AMM 34-14-00-740-001	Interface Test of the IR

3. Fault Confirmation
Subtask 34-11-00-740-138-A

A. Do the interface test of the IR (system 3) AMM 34-14-00-740-001.

4. Fault Isolation
Subtask 34-11-00-810-205-B

A. If the test gives the maintenance message ADIRU3 (1FP3) ADR BUS 1:

(1) If the fault stops:

(2) If the fault continues:

get access to the ADM-STBY TOTAL PRESSURE [19FP3] and ADM-STBY STATIC PRESSURE [19FP8] AMM 34-11-17-000-001 (Para. 2.A.)
disconnect the electrical connector of the STBY total pressure ADM (19FP3) and make sure that there is +13.5V between pins A/C, A and -13.5V between pins A/C, E of the connector receptacle ASM 341303.

(a) If the voltages are not OK:

do a check and repair the wiring between the ADIRU3 and the connector receptacle of the STBY total pressure ADM (19FP3): for pins AA/6G, 6H and 6J of the ADIRU3 and pins A/A, C and E of the connector receptacle
connect the electrical connector of the STBY total pressure ADM (19FP3).

(b) If the voltages are OK:

disconnect the electrical connector of the STBY static pressure ADM (19FP8) and make sure that there is +13.5V between pins A/C, A and -13.5V between pins A/C, E of the connector receptacle ASM 341303.

1 If the voltages are not OK:

do a check and repair the wiring between the connector receptacle of the STBY static pressure ADM (19FP8) and the first terminal block: for pins A/A, C and E of the connector receptacle
connect the electrical connectors of the STBY total pressure ADM (19FP3) and the STBY static pressure ADM (19FP8).

2 If the voltages are OK and if the fault continues:

a If the fault continues :

Subtask 34-11-00-740-139-A

B. Do the test given in Para. 3.

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