Operational Test of the FCU Lighting

TASK 22-10-00-710-004-A
Operational Test of the FCU Lighting

WARNING: MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED BEFORE YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT. UNWANTED ELECTRICAL POWER CAN BE DANGEROUS.

ZONE: 210

1. Reason for the Job
To do a check of the integral lighting and the window lighting of the FCU.
2. Job Set-up Information
A. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD

B. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)

3. Job Set-up
Subtask 22-10-00-861-053-A

A. Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 22-10-00-865-053-A

B. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	AUTO FLT/FCU/1	9CA1	B05
** ON A/C NOT FOR ALL
49VU	AUTO FLT/FCU/1	9CA1	H11
** ON A/C ALL
121VU	AUTO FLT/FCU/2	9CA2	M21
122VU	LIGHTING/INSTL LT/GLARE/SHLD	5LF	Y05

4. Procedure
Subtask 22-10-00-710-054-A

A. Do this test:

ACTION	RESULT
1.On the glareshield, below the FCU:	On the FCU:
Set the two potentiometers to their left stop.	On the front face, the indications go off. The window lighting goes off.
2.Set the left potentiometer to the right stop.	All the indications on the front face get brighter.
3.Set the right potentiometer to the right stop.	The window lighting increases.
4.Set the two potentiometers to the left stop.	Same result as in step 1.

5. Close-up
Subtask 22-10-00-862-053-A

A. De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 05:15:25 UTC