Loss of the IR1 Data Identified by the EFCS1

TASK 34-14-00-810-963-A
Loss of the IR1 Data Identified by the EFCS1

1. Possible Causes

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 34-14-00-740-331-A

A. Test
(1) Do the BITE test of the EFCS (Ground scanning) (system 1) AMM 27-96-00-740-001.

4. Fault Isolation
Subtask 34-14-00-810-219-A

A. If the test gives the maintenance message IR1:

(1) If the fault continues:

remove the ADIRU 1
do a check of the wiring between the ADIRU 1 and the first terminal block : for pins AB/5E, 6E of the ADIRU 1 ASM 341401

(a) If the wiring is not ok:

(b) If the wiring is ok:

do a check of the wiring between the ADIRU 1 and the terminal block 1831VT : for pins AB/10C, 11C of the ADIRU 1 ASM 341401

1 If the above wiring is not ok:

2 If the above wiring is ok:

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

Subtask 34-14-00-740-332-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:32:52 UTC