Operational Test of the FCU

TASK 22-10-00-710-006-A
Operational Test of the FCU

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 selector switches and the display windows
the changeover logic between FCU1 and FCU2
the re-initialization of the two microprocessors for a power cut of more than seven minutes.

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 22-10-00-861-055-A

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

Subtask 22-10-00-865-055-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

Subtask 22-10-00-865-059-A

C. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	AUTO FLT/FMGC/1	10CA1	B02
** ON A/C NOT FOR ALL
49VU	AUTO FLT/FMGC/1	10CA1	H08
** ON A/C ALL
121VU	AUTO FLT/FCU/2	9CA2	M21
121VU	AUTO FLT/FMGC/2	10CA2	M17

4. Procedure
Subtask 22-10-00-710-056-C

A. Do this test:

NOTE: During the test, ignore the visual and aural warnings.

ACTION	RESULT

1.On the FCU, on the EFIS control section: Set the two "in Hg/hPa" selector switches to hPa.
2.On the FCU: Pull and turn the selector knobs to change the values in the display windows.	The FCU shows these values: V/S: +30oo ALT: 40000 HDG: 359 SPD: 399 BARO pressure: 1013.
3.Close the circuit breaker 9CA2.	No change.
4.Open the circuit breaker 9CA1.	The FCU shows the same values as in step 2.
5.On the FCU: Change the values shown.	The FCU shows these values: V/S: -40oo ALT: 15800 HDG: 95 SPD: 120 BARO pressure: 1013
6.Close the circuit breaker 9CA1.	No change.
7.Open the circuit breaker 9CA2.	The FCU shows the same values as in step 5.
8.Open the circuit breaker 9CA1.	On the FCU, all the values go out of view. The displays will stay on for some time.
9.Wait more than 7 minutes and then close the circuit breaker 9CA2.	At the end of the safety test, the FCU shows these values: V/S: +00oo ALT: 00100 HDG: 000 SPD: 100 BARO pressure: 1013. The HDG-V/S indication is in view.
10.Open the circuit breaker 9CA2.	On the FCU, all the values go out of view. Note a residual illumination of the LED values if exists.
11.Close the circuit breaker 9CA1.	The FCU shows the same values as in step 9.
12.Close the circuit breaker 9CA2.	No change.
13.On the FCU: Push then release the HDG-V/S/TRK FPA pushbutton switch.	On the FCU: The TRK-FPA data is shown (indication and display windows).
Push the pushbutton switch again.	The HDG-V/S data is shown (indication and display windows)
14.Close the circuit breaker 10CA1. 15.On the FCU, (at the end of the safety test):
Pull the SPD-MACH selector knob.	The related display shows SPD 100.
Push and release the SPD/MACH pushbutton switch.	The related display window shows MACH .01 or MACH .10 if the ADIRUs are not set to OFF.
Push the pushbutton switch again.	The related display window shows SPD 100.
16.Close the circuit breaker 10CA2.

5. Close-up
Subtask 22-10-00-862-055-A

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

[Rev.10 from 2021] 2026.03.31 23:09:54 UTC