Installation of the APU GLC

TASK 24-23-55-400-001-A
Installation of the APU GLC

WARNING: MAKE SURE THAT NO AC OR DC POWER IS CONNECTED TO THE AIRCRAFT ELECTRICAL CIRCUITS. THERE IS A RISK OF ELECTROCUTION IF THE AC OR DC POWER STAYS CONNECTED.

ZONE: 212
FIN: 3XS

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

REFERENCE	QTY	DESIGNATION
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 0.122 and 0.098 m.daN (10.80 and 8.67 lbf.in )
No specific	Torque wrench: range to between 0.30 and 0.27 m.daN (26.55 and 23.89 lbf.in )
No specific	Torque wrench: range to between 0.60 and 0.50 m.daN (53.10 and 44.25 lbf.in )
No specific	Torque wrench: range to between 0.70 and 0.52 m.daN (61.95 and 46.02 lbf.in )
No specific	Torque wrench: range to between 1.1 and 0.90 m.daN (97.35 and 79.65 lbf.in )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
212	COCKPIT
121AL

C. 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)
TASK 24-41-55-400-001-A	Installation of the External Power Contactor (EPC)
TASK 25-11-41-000-001-A	Removal of the Third Occupant Seat
TASK 25-11-41-400-001-A	Installation of the Third Occupant Seat
TASK 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure
Contactor Base ** ON A/C NOT FOR ALL
APU/EXT Power-Contactor Module ** ON A/C NOT FOR ALL
Contactor ** ON A/C NOT FOR ALL
Contactor ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 24-23-55-010-051-A

A. Get Access
(1) Make sure that the Third Occupant seat is removed (Ref. AMM TASK 25-11-41-000-001).
(2) On the left lower side of panel 120VU, make sure that the access panel (4) is removed.
(3) Make sure that an access platform is in position at access door 121AL.
(4) Make sure that access door 121AL is open.

Subtask 24-23-55-860-051-A

B. Aircraft Maintenance Configuration
(1) Make sure that the external power connector is not connected to the aircraft EXT PWR receptacle.
(2) Make sure that the warning notice(s) are in position on access door 121AL to tell persons not to connect the external power connector to the aircraft EXT PWR receptacle.
(3) In the cockpit, on ELEC panel 35VU, make sure that the pushbutton switches that follow are released:

BAT 1, BAT 2
APU GEN
GEN 1, GEN 2
EXT PWR.

(4) In the cockpit, make sure that the WARNING NOTICE(S) are in position to tell persons not to operate the pushbutton switches on the overhead panels that follow:

21VU (EMER ELEC PWR section)
25VU (APU section)
35VU (ELEC).

4. Procedure
Subtask 24-23-55-420-051-A ** ON A/C NOT FOR ALL

A. Installation of the Contactor Base

Contactor Base ** ON A/C NOT FOR ALL

CAUTION: REFER TO THE MATCH MARKS MADE DURING THE REMOVAL WHEN YOU CONNECT THE ELECTRICAL WIRES. INCORRECT CONNECTION OF THE WIRES WILL CAUSE DAMAGE TO EQUIPMENT.

(1) Install the contactor base in the correct position, if removed.
(2) Install the four washers (5) and screws (6) and tighten them.
(a) TORQUE the four screws (6) to between 0.30 and 0.27 m.daN (26.55 and 23.89 lbf.in )

.
(3) Make sure that the three electrical cables (3) and the three electrical wires (15) are clean and in the correct condition.
(4) Install the three electrical cables (3).
(a) Install the three washers (2) and nuts (1) and tighten them.
(b) TORQUE the three nuts (1) to between 1.1 and 0.90 m.daN (97.35 and 79.65 lbf.in )

.
(5) Install the three electrical wires (15).
(a) Install the three washers (14) and screws (13) and tighten them.
(b) TORQUE the three screws (13) to between 0.122 and 0.098 m.daN (10.80 and 8.67 lbf.in )

.
(6) Install the six jumpers (7) between the contactor base and the adjacent bases.
(a) Install the twelve washers (8) and nuts (9) and tighten them.
(b) TORQUE the twelve nuts (9) to between 0.70 and 0.52 m.daN (61.95 and 46.02 lbf.in )

.
(7) Install the three jumpers (10) between the contactor base and the adjacent base.
(a) Install the six washers (11) and nuts (12) and tighten them.
(b) TORQUE the six nuts (12) to between 0.70 and 0.52 m.daN (61.95 and 46.02 lbf.in )

Subtask 24-23-55-420-050-A ** ON A/C NOT FOR ALL

B. Installation of the Contactor

Contactor ** ON A/C NOT FOR ALL

(1) Install the contactor (2) on the six tapped barrels of the contactor base (5).
(2) TORQUE the six captive screws (3) to between 0.60 and 0.50 m.daN (53.10 and 44.25 lbf.in )

.
(3) Remove the blanking caps from the electrical connector (1) and the electrical receptacle (6).
(4) Make sure that all the electrical connections are clean and in the correct condition.
(5) Connect the electrical connector (1).

Subtask 24-23-55-420-051-B ** ON A/C NOT FOR ALL

C. Installation of the APU/EXT Power-Contactor Module

APU/EXT Power-Contactor Module ** ON A/C NOT FOR ALL

CAUTION: REFER TO THE MATCH MARKS MADE DURING THE REMOVAL WHEN YOU CONNECT THE ELECTRICAL WIRES. INCORRECT CONNECTION OF THE WIRES WILL CAUSE DAMAGE TO EQUIPMENT.

(1) Install the APU/EXT power-contactor module (5) in the correct position, if removed.
(2) Install the eight washers (9) and screws (10) and tighten them.
(a) TORQUE the nuts (10) to between 0.30 and 0.27 m.daN (26.55 and 23.89 lbf.in )

.
(3) Make sure that the electrical cables (3) and (13) and the electrical wires (16) are clean and in the correct condition.
(4) Install the six electrical cables (3).
(a) Install the six washers (2) and nuts (1) and tighten them.
(b) TORQUE the six nuts (1) to between 1.1 and 0.90 m.daN (97.35 and 79.65 lbf.in )

.
(5) Install the three electrical wires (16).
(a) Install the three washers (15) and screws (14) and tighten them.
(b) TORQUE the three screws (14) to between 0.122 and 0.098 m.daN (10.80 and 8.67 lbf.in )

.
(6) Install the six jumpers (6) between the APU/EXT power-contactor module (5) and the adjacent modules.
(a) Install the twelve washers (7) and screws (8) and tighten them.
(b) TORQUE the twelve screws (8) to between 0.70 and 0.52 m.daN (61.95 and 46.02 lbf.in )

.
(7) Install the three electrical cables (13).
(a) Install the three washers (12) and screws (11) and tighten them.
(b) TORQUE the three screws (11) to between 1.1 and 0.90 m.daN (97.35 and 79.65 lbf.in )

.
(8) Install the EPC (Ref. AMM TASK 24-41-55-400-001).

Subtask 24-23-55-420-050-B ** ON A/C NOT FOR ALL

D. Installation of the Contactor

Contactor ** ON A/C NOT FOR ALL

(1) Install the contactor (2) on the APU/EXT power-contactor module (5).
(2) TORQUE the six captive screws (3) to between 0.60 and 0.50 m.daN (53.10 and 44.25 lbf.in )

Subtask 24-23-55-710-050-A

E. Test of the Contactor
(1) Energize the aircraft electrical circuits from the APU (Ref. AMM TASK 24-41-00-861-002).
(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 the A/C electrical configuration is correct.
(5) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(6) De-energize the aircraft electrical circuits supplied from the APU (Ref. AMM TASK 24-41-00-862-002).

5. Close-up
Subtask 24-23-55-410-050-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the access panel (4) on the left lower side of the panel 120VU.
(3) Install the third occupant seat (Ref. AMM TASK 25-11-41-400-001).
(4) Remove the WARNING NOTICE(S).
(5) Close the access door 121AL.
(6) Remove the access platform(s).

[Rev.10 from 2021] 2026.03.31 23:22:34 UTC