Loss of the IR 1 BUS 3 Output Identified by the EIS 3

TASK 34-14-00-810-817-A
Loss of the IR 1 BUS 3 Output Identified by the EIS 3

1. Possible Causes

ADIRU-1 [1FP1]
wiring of the INERTIAL REFERENCE OUTPUT BUS 3 bus from the ADIRU 1 (1FP1) to the first terminal block

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-60-00-740-002	Perform Electronic Instrument System (EIS) Input Test
AMM 31-60-00-740-007	GROUND SCANNING Test of the DMC
AMM 34-12-34-000-001	Removal of the ADIRU
AMM 34-12-34-400-001	Installation of the ADIRU
ASM 341401

3. Fault Confirmation
Subtask 34-14-00-740-075-A ** ON A/C NOT FOR ALL

A. Test
Do the EIS input test (system 3) AMM 31-60-00-740-002.

Subtask 34-14-00-740-075-B ** ON A/C NOT FOR ALL

A. Test
Do the Ground Scanning Test of the DMC (system 3) AMM 31-60-00-740-007.

4. Fault Isolation
Subtask 34-14-00-810-066-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message DMC3 : NO IRS1 DATA:

(1) If the fault continues:

do a check and repair the wiring of the INERTIAL REFERENCE OUTPUT BUS 3 bus from the ADIRU 1 (1FP1) to the first terminal block ASM 341401.

Subtask 34-14-00-810-066-B ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message ADIRU1(1FP1)BUS1 IR/DMC3(1WT3)

(1) If the fault continues:

do a check and repair the wiring of the INERTIAL REFERENCE OUTPUT BUS 3 bus from the ADIRU 1 (1FP1) to the first terminal block ASM 341401.

Subtask 34-14-00-740-076-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:32:43 UTC