Loss of the ADR2 BUS3 Output Identified by the EFCS1

TASK 34-13-81-810-805-A
Loss of the ADR2 BUS3 Output Identified by the EFCS1

1. Possible Causes

ADIRU-2 [1FP2]
wiring of the ADR OUTPUT BUS3 bus from the ADIRU2 (1FP2) to the first terminal block
wiring between the terminal blocks 1510VT and 1851VT

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 27-96-00-740-001	BITE Test of the EFCS (Ground Scanning)
AWM 341122
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 34-13-81-740-058-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 34-13-81-810-054-A

A. If the test gives the maintenance message ADR2 OR BUS3 TO ELAC1:

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

(a) If the fault continues:

do a check and repair the wiring of the ADR OUTPUT BUS3 bus from the ADIRU2 (1FP2) to the first terminal block ASM 341301.

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

do a check and repair the wiring between the terminal blocks 1510VT and 1851VT between pins 1U, 1V and 4E, 3E AWM 341122.

Subtask 34-13-81-740-059-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:32:33 UTC