Loss of the ADR 1 BUS 4 Output Identified by the ATC 1

TASK 34-13-00-810-838-A
Loss of the ADR 1 BUS 4 Output Identified by the ATC 1

1. Possible Causes

ADIRU-1 [1FP1]
wiring of the ADR OUTPUT BUS 4 bus from the ADIRU 1 (1FP1) to the first terminal block

2. Job Set-up Information
A. Referenced Information

3. Fault Confirmation
Subtask 34-13-00-740-091-A

A. Test
Do the BITE test of the ATC (system 1) AMM 34-52-00-740-004.

4. Fault Isolation
Subtask 34-13-00-810-087-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message ATC1: NO DATA FROM ADIRU:

(1) If the fault continues:

do a check and repair the wiring of the ADR OUTPUT BUS 4 bus from the ADIRU 1 (1FP1) to the first terminal block, ASM 341301.

Subtask 34-13-00-810-087-B ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message ADIRU 1/3 (1FP1/3)/ ATC1 (1SH1) :

(1) If the fault continues:

do a check and repair the wiring of the ADR OUTPUT BUS 4 bus from the ADIRU 1 (1FP1) to the first terminal block, ASM 341301.

Subtask 34-13-00-740-092-A

B. Do the test given in Para. 3.A.

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