Loss of the IR 1 BUS 3 Output Identified by the EFCS 2

TASK 34-14-00-810-815-A
Loss of the IR 1 BUS 3 Output Identified by the EFCS 2

1. Possible Causes

ADIRU-1 [1FP1]
wiring of the INERTIAL REFERENCE OUTPUT BUS 3 bus from the ADIRU 1 (1FP1) to the terminal block 1831VT

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 31-32-00-810-934-A	Failure of the Digital Links
AMM 27-96-00-740-001	BITE Test of the EFCS (Ground Scanning)
AWM 341137
AMM 34-12-34-000-001	Removal of the ADIRU
AMM 34-12-34-400-001	Installation of the ADIRU
ASM 341401

3. Fault Confirmation
Subtask 34-14-00-740-071-A

A. Test
Do the BITE test of the EFCS (ground scanning) (system 2) AMM 27-96-00-740-001.

4. Fault Isolation
Subtask 34-14-00-810-064-A

A. If the test gives the maintenance message IR1 - BUS3:

(1) If the fault continues:

do a check and repair the wiring of the INERTIAL REFERENCE OUTPUT BUS 3 bus from the ADIRU 1 (1FP1) to the terminal block 1831VT: For pins AB/10C, 11C of the ADIRU1 ASM 341401 AWM 341137.

(a) If the fault continues:

do the trouble shooting procedure that follows (Ref. TSM TASK 31-32-00-810-934).

Subtask 34-14-00-740-072-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:32:43 UTC