Loss of the A/THR Pushbutton Switch Function on the FMGC 2

TASK 22-31-00-810-811-A
Loss of the A/THR Pushbutton Switch Function on the FMGC 2

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 22-31-00-710-070-A

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

4. Fault Isolation
Subtask 22-31-00-865-057-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	AUTO FLT/FCU/2	9CA2	M21
121VU	AUTO FLT/FMGC/2	10CA2	M17

Subtask 22-31-00-810-063-A

B. If the test gives the maintenance message AFS: CHK FG2-ATHR P/B CKT:

open the circuit breakers 9CA2 and 10CA2
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 2 .

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

Subtask 22-31-00-710-071-A

C. Do the test given in Para. 3.

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