Loss of the A/THR Pushbutton Switch Function on the FMGC 1

TASK 22-31-00-810-810-A
Loss of the A/THR Pushbutton Switch Function on the FMGC 1

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 22-97-00-710-001	Operational Test of the LAND CAT III Capability

3. Fault Confirmation
Subtask 22-31-00-710-068-A

A. Test
(1) Do the operational test of the LAND CAT III capability AMM 22-97-00-710-001.

4. Fault Isolation
Subtask 22-31-00-865-056-A

A. Table of the circuit breakers used in this procedure:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	AUTO FLT/FCU/1	9CA1	B05
49VU	AUTO FLT/FMGC/1	10CA1	B02

Subtask 22-31-00-810-062-A

B. If the test gives the maintenance message AFS: CHK FG1-ATHR P/B CKT:

open the circuit breakers 9CA1 and 10CA1
after 15 s, close these circuit breakers
push the A/THR pushbutton switch
after 1 minute, do the operational test of the AFS AMM 22-96-00-710-001 and read the result for the FMGC 1 .

(1) If the test gives a different message, do the trouble shooting procedure related to the maintenance message.

Subtask 22-31-00-710-069-A

C. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:25:09 UTC