Loss of the GPSSU1 Input on the ADIRU3

TASK 34-14-00-810-994-A
Loss of the GPSSU1 Input on the ADIRU3

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 34-14-00-740-001	Interface Test of the IR
AMM 34-36-31-000-001	Removal of the ILS Receiver
AMM 34-36-31-400-001	Installation of the ILS Receiver

3. Fault Confirmation
Subtask 34-14-00-740-380-B ** ON A/C NOT FOR ALL

A. Test
(1) Do the Interface test of the IR (system 3) AMM 34-14-00-740-001.

4. Fault Isolation
Subtask 34-14-00-810-253-B ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message GPSSU1 (1SN1):

read the POST FLIGHT REPORT for other GPSSU1 (1SN1) maintenance messages (ATA 34-58-31 source IR1, IR2).

NOTE: In this case the GPSSU1 message is for the GPS part of the MMR1.

(1) If there is a minimum of one maintenance message:

Subtask 34-14-00-740-381-B ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:32:55 UTC