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

TASK 34-14-00-810-856-A
Loss of the IR 3 BUS 2 Output Identified by the EFCS 2

1. Possible Causes

ADIRU-3 [1FP3]
wiring of the INERTIAL REFERENCE OUTPUT BUS 2 bus from the ADIRU 3 (1FP3) to the first terminal block

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)
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 34-14-00-740-140-A

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

4. Fault Isolation
Subtask 34-14-00-810-105-A

A. If the test gives the maintenance message IR3 - BUS2:

(1) If the fault continues:

do a check and repair the wiring of the INERTIAL REFERENCE OUTPUT BUS 2 bus from the ADIRU 3 (1FP3) to the first terminal block ASM 341401.

(a) If the fault continues:

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

Subtask 34-14-00-740-141-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:32:46 UTC