Installation of the GCU-1(2)

TASK 24-22-34-400-001-A
Installation of the GCU-1(2)

CAUTION: USE ONLY THE GROUND SERVICE NETWORK TO SUPPLY THE AIRCRAFT WITH AC AND DC POWER. YOU CAN CAUSE DAMAGE TO THE EQUIPMENT DURING ITS REMOVAL/ INSTALLATION IF THE RELATED NETWORK IS NOT ISOLATED.

ZONE: 121
FIN: 1XU1
FIN: 1XU2

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
121	AVIONICS COMPARTMENT
811

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-740-002-B	Operational Check of the GAPCU via the CFDS
TASK 24-41-00-740-004-A	Operational Check of the GPCU via the CFDS
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
TASK 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure
TASK 71-00-00-710-003-A	Engine Automatic Start
TASK 71-00-00-710-003-B	Engine Automatic Start
TASK 71-00-00-710-018-A	Discontinued Start, Restart and Shutdown Procedures
TASK 71-00-00-710-028-A	Engine Shutdown
TASK 71-00-00-710-028-B	Engine Shutdown
TASK 71-00-00-710-043-A	Normal Engine Automatic-Start Procedure
TASK 71-00-00-860-814-A	Shutdown of the Engine
TASK 71-00-00-860-823-A	Start the Engine (Normal Automatic Start)
Generator Control Unit 1(2) GCU-1(2) ** ON A/C NOT FOR ALL
Generator Control Unit 1(2) GCU-1(2) ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 24-22-34-860-051-A

A. Aircraft Maintenance Configuration
(1) Make sure that the ground service network is energized
(Ref. AMM TASK 24-42-00-861-001).
(2) Make sure that the WARNING NOTICE(S) is in the cockpit to tell persons not to operate the pushbutton switches (ENG MASTER 1(2)) on the pylon panel 115VU (ENG panel).

Subtask 24-22-34-865-054-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
FOR FIN: 1XU1 (GCU1)
122VU	ELEC/GCU/1	2XU1	T26
FOR FIN: 1XU2 (GCU2)
122VU	ELEC/GCU/2	2XU2	T27

Subtask 24-22-34-010-053-A

C. Get Access
(1) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position at the access door 811.
(2) Make sure that the access door 811 is open.

4. Procedure
Subtask 24-22-34-420-050-A

A. Installation of the GCU
(1) Remove the CAP-BLANKING from each electrical connector and receptacle.
(2) Make sure that all the electrical connections are clean and in the correct condition.
(3) Clean the component interfaces and the adjacent area.
(4) Do an inspection of the component interfaces and the adjacent area.
(5) Put the GCU in position in the rack (6).
(6) Carefully push the GCU until it is connected to the rack receptacle (5).
(7) Lift the 2 knurled nuts (1) on the 2 studs (2).
(8) Tighten the 2 knurled nuts (1).

Subtask 24-22-34-865-057-A

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
FOR FIN: 1XU1 (GCU1)
122VU	ELEC/GCU/1	2XU1	T26
FOR FIN: 1XU2 (GCU2)
122VU	ELEC/GCU/2	2XU2	T27

Subtask 24-22-34-710-050-A ** ON A/C NOT FOR ALL

C. Do the operational check of the GPCU with the CFDS (Ref. AMM TASK 24-41-00-740-004).

NOTE: As an alternative procedure, do this operational test without the CFDS.

Subtask 24-22-34-710-050-B ** ON A/C NOT FOR ALL

C. Do an operational test of the GAPCU with the CFDS (Ref. AMM TASK 24-41-00-740-002).

NOTE: As an alternative procedure, do this operational test without the CFDS.

Subtask 24-22-34-710-051-A ** ON A/C NOT FOR ALL

D. Operational test of the GPCU without the CFDS.
(1) Start the engine 1(2) automatically (Ref. AMM TASK 71-00-00-710-003).
(2) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).
(3) On the ECAM control panel:

push the ELEC key to get the ELEC system page.

(4) On the lower ECAM display unit, make sure that there is the green line between GEN1(2) and AC1(2).
(5) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002)
(6) Stop the engine 1 (2) (Ref. AMM TASK 71-00-00-710-028).

Subtask 24-22-34-710-051-C ** ON A/C NOT FOR ALL

D. Operational test of the GAPCU without the CFDS.
(1) Start the engine 1(2) automatically (Ref. AMM TASK 71-00-00-710-043).
(2) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).
(3) On the ECAM control panel:

push the ELEC key to get the ELEC system page.

Subtask 24-22-34-710-051-F ** ON A/C NOT FOR ALL

D. Operational test of the GAPCU without the CFDS
(1) Start the engine 1(2) automatically (Ref. AMM TASK 71-00-00-710-003).
(2) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).
(3) On the ECAM control panel:

push the ELEC key to get the ELEC system page.

Subtask 24-22-34-710-051-I ** ON A/C NOT FOR ALL

D. Operational test of the GAPCU without the CFDS
(1) Start engine 1(2) (normal automatic start) (Ref. AMM TASK 71-00-00-860-823).
(2) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).
(3) On the ECAM control panel, push the ELEC key to get the ELEC system page.
(4) On the lower ECAM DU, make sure that there is the green line between the GEN1(2) and AC1(2) indications is shown.
(5) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(6) Stop engine 1(2) (Ref. AMM TASK 71-00-00-860-814).

5. Close-up
Subtask 24-22-34-410-050-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access door 811.
(3) Remove the WARNING NOTICE(S).
(4) Remove the access platform(s).

Subtask 24-22-34-860-054-A

B. Put the aircraft back to its initial configuration.
(1) De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

[Rev.10 from 2021] 2026.03.31 23:22:11 UTC