Electrical Transient Effect on the FMGC's

TASK 22-83-00-810-875-A
Electrical Transient Effect on the FMGC's

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 24-41-00-861-002	Energize the Aircraft Electrical Circuits from the External Power
AMM 24-41-00-862-002	De-energize the Aircraft Electrical Circuits Supplied from the External Power

3. Fault Confirmation
Subtask 22-83-00-860-059-A

A. Job Set-Up
(1) Aircraft Maintenance Configuration
(a) Energize the aircraft electrical circuits
AMM 24-41-00-861-002
(b) Make sure that the aircraft is in the ground condition with the engines stopped.
(c) On the FCU, make sure that the two FD pushbutton switches are released.

Subtask 22-83-00-710-177-A

B. Test
(1) Not applicable.

4. Fault Isolation
Subtask 22-83-00-865-097-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	AUTO FLT/FMGC/1	10CA1	B02
121VU	AUTO FLT/FMGC/2	10CA2	M17

Subtask 22-83-00-810-157-A

B. Do the procedure:
Note: Do not do a reset of the FMGC circuit breakers until the power-up test is completed (approximately 2 minutes).
(1) If there is an electrical transient effect on one FMGC:

for the FMGC 1 (1CA1), open the circuit breaker (10CA1) and after 5 seconds close it.
for the FMGC 2 (1CA2): pull the circuit breaker (10CA2) and after 5 seconds close it.

(a) If the fault continues:

open the the two circuit breakers (10CA1 and 10CA2) at the same time and after 5 seconds close them at the same time.

5. Close-up
Subtask 22-83-00-860-060-A

A. Put the aircraft back to its initial configuration.
(1) On the FCU, push the two FD pushbutton switches after 10 seconds.
(2) De-energize the aircraft electrical circuits
AMM 24-41-00-862-002

[Rev.8 from Aug 2018] 2026.04.04 04:25:34 UTC