FM/GPS Position Disagree

TASK 34-36-00-810-872-A
FM/GPS Position Disagree

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 22-96-00-710-001	Operational Test of the AFS
AMM 34-12-34-200-001	ADIRU Removal Criteria
AMM 34-36-00-710-002	Operational Test of the GPS
AMM 34-36-00-710-008	Operational Test of the GPS

3. Fault Confirmation
Subtask 34-36-00-740-158-A

A. Test

Not applicable, you cannot confirm this fault on the ground.

4. Fault Isolation
Subtask 34-36-00-810-140-A

A. Do a check for a maintenance message on the POST FLIGHT REPORT (PFR).
(1) If there is a message and/or a warning other than "FM/GPS POSITION DISAGREE" related to FMGC, GPSSU, MMR or ADIRU:

Refer to the related trouble shooting procedure.

Subtask 34-36-00-810-141-B ** ON A/C NOT FOR ALL

B. If there is no message and no other warning than "FM/GPS POSITION DISAGREE" on the PFR:
(1) Do an operational test of the AFS AMM 22-96-00-710-001.
(a) If there is maintenance message(s) related to the AFS:

Do the related trouble shooting procedure.

(2) Do an operational test of the GPS AMM 34-36-00-710-002.
(a) If there is maintenance message(s) related to the GPS:

Do the related trouble shooting procedure.

(3) Do a check of the ADIRU removal criteria AMM 34-12-34-200-001

Subtask 34-36-00-810-141-C ** ON A/C NOT FOR ALL

Do the related trouble shooting procedure.

(2) Do an operational test of the GPS AMM 34-36-00-710-008.
(a) If there is maintenance message(s) related to the GPS:

Do the related trouble shooting procedure.

(3) Do a check of the ADIRU removal criteria AMM 34-12-34-200-001

Subtask 34-36-00-740-159-A

C. Make sure during the next taxiing that the NAV FM/GPS POS DISAGREE warning is not shown on the upper ECAM DU.

[Rev.8 from Aug 2018] 2026.04.04 04:33:02 UTC