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

TASK 34-13-00-810-850-A
Loss of the ADR 1 BUS 3 Output Identified by the EFCS 2

1. Possible Causes

ADIRU-1 [1FP1]
wiring of the ADR OUTPUT BUS 3 bus from the ADIRU 1 (1FP1) 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 341121
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 34-13-00-740-111-A

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

4. Fault Isolation
Subtask 34-13-00-810-099-A

A. If the test gives the maintenance message ADR1 BUS 3:

(1) If the test gives the maintenance message ADIRU1 (1FP1)/ADIRU3 (1FP3):

(a) If the fault continues:

do a check and repair the wiring of the ADR OUTPUT BUS 3 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)/ADIRU3 (1FP3):

do a check and repair the wiring between the terminal blocks 1510VT and 1851VT : between pins 1X, 1Y and 2E, 1E AWM 341121.

Subtask 34-13-00-740-112-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:32:24 UTC