Loss of the ADR 1 BUS 2 Output Identified by the EFCS 1

TASK 34-13-00-810-822-A
Loss of the ADR 1 BUS 2 Output Identified by the EFCS 1

1. Possible Causes

ADIRU-1 [1FP1]
wiring of the ADR OUTPUT BUS 2 bus from the ADIRU 1 (1FP1) to the first terminal block
wiring between the terminal blocks 1512VT and 1860VT

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 27-96-00-740-001	BITE Test of the EFCS (Ground Scanning)
AWM 341118
AMM 34-12-34-000-001	Removal of the ADIRU
AMM 34-12-34-400-001	Installation of the ADIRU
ASM 341301
AMM 34-14-00-740-001	Interface Test of the IR

3. Fault Confirmation
Subtask 34-13-00-740-073-A

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

4. Fault Isolation
Subtask 34-13-00-810-071-A

A. If the test gives the maintenance message ADR1 BUS 2:

(1) If the test gives the maintenance message ADIRU1 (1FP1)/ADIRU2 (1FP2):

(a) If the fault continues:

do a check and repair the wiring of the ADR OUTPUT BUS 2 bus from the ADIRU 1 (1FP1) to the first terminal block, ASM 341301.

(2) If the test does not give the maintenance message ADIRU1 (1FP1)/ADIRU2 (1FP2):

do a check and repair the wiring between the terminal blocks 1512VT and 1860VT : between pins 15X, 15Y and 28N, 27N AWM 341118.

Subtask 34-13-00-740-074-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:32:22 UTC