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

TASK 34-13-00-810-877-A
Loss of the ADR 3 BUS 2 Output Identified by the EFCS 1

1. Possible Causes

ADIRU-3 [1FP3]
wiring of the ADR OUTPUT BUS 2 bus from the ADIRU 3 (1FP3) 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 341120
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 34-13-00-740-139-A

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

4. Fault Isolation
Subtask 34-13-00-810-126-A

A. If the test gives the maintenance message ADR3 BUS 2:

(1) If the test gives the maintenance message ADIRU3 (1FP3)/ADIRU2 (1FP2):

(a) If the fault continues:

do a check and repair the wiring of the ADR OUTPUT BUS 2 bus from the ADIRU 3 (1FP3) to the first terminal block ASM 341301.

(2) If the test does not give the maintenance message ADIRU3 (1FP3)/ADIRU2 (1FP2):

do a check and repair the wiring between the terminal blocks 1512VT and 1860VT : between pins 15V, 15U and 27R, 27A AWM 341120.

Subtask 34-13-00-740-188-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:32:26 UTC