Internal Failure of the IR 3

TASK 34-14-00-810-846-A
Internal Failure of the IR 3

1. Possible Causes

ADIRU-3 [1FP3]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-32-00-860-001	Procedure to Get Access to the SYSTEM REPORT/TEST Menu Page
AMM 34-10-00-860-004	IR Alignment Procedure
AMM 34-12-34-000-001	Removal of the ADIRU
AMM 34-12-34-400-001	Installation of the ADIRU
AMM 34-12-34-610-801	Uploading of Software to the ADIRUs
AMM 34-14-00-740-001	Interface Test of the IR

3. Fault Confirmation
Subtask 34-14-00-740-123-A

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

4. Fault Isolation
Subtask 34-14-00-810-095-B ** ON A/C NOT FOR ALL

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

replace the ADIRU-3 [1FP3] AMM 34-12-34-000-001 and AMM 34-12-34-400-001.

Subtask 34-14-00-810-095-C ** ON A/C NOT FOR ALL

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

do the uploading of software to the ADIRU3 AMM 34-12-34-610-801.

(1) If the fault continues:

replace the ADIRU-3 [1FP3] , AMM 34-12-34-000-001 and AMM 34-12-34-400-001.

Subtask 34-14-00-810-233-A ** ON A/C NOT FOR ALL

B. If the test does not give the maintenance message ADIRU3 or ADIRU3 (1FP3), get access to the Trouble Shooting Data.
On the center pedestal, on the one MCDU get the SYSTEM REPORT/TEST/NAV page. AMM 31-32-00-860-001

ACTION	RESULT
On the MCDU:	On the MCDU:
Push the line key adjacent to the IR3 indication	the IR3 page comes into view
push the line key adjacent to the TROUBLE SHOOT DATA indication	the IR3 TROUBLE SHOOTING DATA page comes into view If the two middle digits in the first word of the TROUBLE SHOOT DATA are xE5x or xF6x, do the IR Alignment procedure AMM 34-10-00-860-004 If not, or if the alignment is not successful, replace the ADIRU-3 [1FP3] AMM 34-12-34-000-001 and AMM 34-12-34-400-001.

[Rev.8 from Aug 2018] 2026.04.04 04:32:45 UTC