Installation of the Start Contactors

TASK 49-42-55-400-001-A
Installation of the Start Contactors

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.

FIN: 10KA
FIN: 5KA

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	ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE
No specific	1	SOCKET DIA 13 MM (0,51 IN)
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 0.912 and 0.686 m.daN (80.71 and 60.71 lbf.in )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
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 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
Start Contactors

3. Job Set-up
Subtask 49-42-55-010-051-A

A. Get Access
(1) Make sure that the third occupant seat is removed (Ref. AMM TASK 25-11-41-000-001).
(2) In the cockpit, on the left lower side of the panel 120VU:

make sure that the access door (1) is open.

(3) Make sure that the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE is in position at the access door 121AL.
(4) Make sure that the access door 121AL is open.

Subtask 49-42-55-860-051-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) is in position at the access door 121AL to tell persons not to connect the external power connector.
(3) In the cockpit, on the overhead panel 35VU, make sure that these pushbutton switches are released:

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

(4) Make sure that there is a WARNING NOTICE(S) in the cockpit to tell persons not to operate the pushbutton switches on these overhead panels:

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

4. Procedure
Subtask 49-42-55-420-050-A

A. Installation of the Start Contactor(s)
(1) Put the contactor(s) (4) in position, aligned with the locating hole.
(2) Install the contactor(s) (4) on the DC Bus 1 Contactor Module (13PN).
(3) Use a SOCKET DIA 13 MM (0,51 IN) to TORQUE the captive screws (3) to between 0.912 and 0.686 m.daN (80.71 and 60.71 lbf.in )

.
(4) Remove the blanking caps from the electrical connector(s) (2).
(5) Make sure that the electrical connector(s) (2) are clean and in the correct condition.
(6) Connect the electrical connector(s) (2) to the contactor(s) (4).

Subtask 49-42-55-861-050-A

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

Subtask 49-42-55-860-052-A

C. Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).

Subtask 49-42-55-710-050-A

D. Test of the Contactor
(1) On the ECAM control panel:

push the ELEC key to get the ELEC system page.

(2) On the lower ECAM DU, make sure that the aircraft electrical configuration is correct.

Subtask 49-42-55-860-053-A

E. Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).

Subtask 49-42-55-862-050-A

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

5. Close-up
Subtask 49-42-55-410-050-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) In the cockpit, in the left Lower side of the panel 120VU:

install the access door (1).

(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] 2026.04.01 01:30:43 UTC