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

TASK 34-14-00-810-816-A
Loss of the IR 1 BUS 3 Output Identified by the CFDS

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 31-32-00-869-002	Procedure for the Class 3 Fault Reading
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 34-14-00-865-051-A

A. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	NAV PROBES/ADIRU 1/AND AOA 1/26VAC	5FP1	F07
49VU	NAV PROBES/ADIRU1/115VAC	4FP1	F06
105VU	ADIRS/ADIRU1/28VDC	6FP1	C02

Subtask 34-14-00-740-073-A

B. Test
On the CFDS MENU page, get access to the AVIONICS STATUS page AMM 31-32-00-869-002.

4. Fault Isolation
Subtask 34-14-00-810-065-A

A. If the test gives the maintenance message NO IR1 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 34-14-00-740-074-A

B. Do the test given in Para. 3.

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