NAV IR X FAULT or NAV ADR X FAULT ECAM Warning without Maintenance Message

TASK 34-14-00-810-996-A
NAV IR X FAULT or NAV ADR X FAULT ECAM Warning without Maintenance Message

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 34-12-34-000-001	Removal of the ADIRU
AMM 34-12-34-400-001	Installation of the ADIRU
AMM 34-13-00-740-003	SYSTEM TEST of the ADR
AMM 34-14-00-740-004	SYSTEM TEST of the Inertial Reference (IR)

3. Fault Confirmation
Subtask 34-14-00-875-050-A ** ON A/C NOT FOR ALL

A. Table of the circuit breakers used in this procedure:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 40RT1 (MMR1)
49VU	NAV/MMR/1	42RT1	G12
FOR FIN: 40RT2 (MMR2)
121VU	COM NAV/MMR/2	42RT2	L07
FOR FIN: 1FP1 (ADIRU1)
49VU	NAV PROBES/ADIRU 1/AND AOA 1/26VAC	5FP1	F07
FOR FIN: 1FP2 (ADIRU2)
121VU	ADIRS/ADIRU/2/26VAC AND AOA	5FP2	N08
FOR FIN: 1FP3 (ADIRU3)
121VU	ADIRS/ADIRU/3/26VAC AND AOA	5FP3	N07

Subtask 34-14-00-700-053-A ** ON A/C NOT FOR ALL

B. Open, safety and tag these circuit breakers: 42RT1, 42RT2, 5FP1, 5FP2 and 5FP3.

4. Fault Isolation
Subtask 34-14-00-810-256-A ** ON A/C NOT FOR ALL

A. Do a check to see if the test gives one of the maintenance messages that follow:

MMR1-GPSSU1(40RT1-1SN1) ADIRU1(1FP1)
MMR1-GPSSU1(40RT1-1SN1) ADIRU2(1FP2)
MMR1-GPSSU1(40RT1-1SN1) ADIRU3(1FP3)
MMR2-GPSSU2(40RT2-1SN2) ADIRU1(1FP1)
MMR2-GPSSU2(40RT2-1SN2) ADIRU2(1FP2)
MMR2-GPSSU2(40RT2-1SN2) ADIRU3(1FP3).

(1) If yes:

(a) Do a check to see if the test gives one of the maintenance messages that follow:

1 If yes:

Remove the safety clips and the tags and close these circuit breakers: 42RT1, 42RT2, 5FP1, 5FP2 and 5FP3.

2 If no, replace the ADIRU related to the ECAM warning:

(2) If no, replace the ADIRU related to the ECAM warning:

Subtask 34-14-00-720-050-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.B.

[Rev.8 from Aug 2018] 2026.04.04 04:32:55 UTC