Installation of the Battery Line Contactor

TASK 24-38-55-400-001-A
Installation of the Battery Line Contactor

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: 126
ZONE: 212
FIN: 6PB1
FIN: 6PB2

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 1M (3 FT)-ADJUSTABLE
No specific	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 41.6 and 33.63 lbf.in (0.47 and 0.38 m.daN )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
126	LATERAL AVIONIC COMPARTMENT
212	COCKPIT
121AL, 812, 822

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-38-00-710-001-A	Operational Test of the Battery Charge Limiter (BCL), (with the CFDS)
TASK 24-38-00-710-001-A-01	Operational Test of the Battery Charge Limiter (BCL), (without the CFDS)
TASK 24-38-51-400-001-A	Installation of the Battery
Contactors
FOR [2PB1] (BAT-1)
TASK 31-21-00-750-002-A	Procedure to Set the Clock

3. Job Set-up
Subtask 24-38-55-860-050-B

A. Aircraft Maintenance Configuration
(1) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE are in position at the avionics compartment doors 812 and 822.
(2) Make sure that the avionics compartment doors 812 and 822 are open.
(3) Make sure that ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE is in position at the access door 121AL.
(4) Make sure that access door 121AL is open.
(5) Make sure that the external power connector is not connected to the aircraft receptacle.
(6) Make sure that a WARNING NOTICE(S) is in position on access door 121AL to tell persons not to use the external power receptacle.
(7) In the cockpit, on the overhead ELEC panel 35VU, make sure that these pushbutton switches are released:

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

(8) Make sure that the electrical connectors of the two batteries are disconnected.
(9) In the cockpit, make sure that a WARNING NOTICE(S) is in position to tell persons not to operate the pushbutton switches on these overhead panels:

21VU (EMER ELEC PWR)
35VU (ELEC).

(10) In the cockpit, on the APU section of the overhead panel 25VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the APU.

4. Procedure
Subtask 24-38-55-420-050-A

A. Installation of the Contactor

CAUTION: MAKE SURE THAT THE CONTACTOR LOCATING PIN IS CORRECTLY ENGAGED IN ITS RECESS LOCATED IN ONE POWER TERMINAL. THIS PREVENTS DAMAGE TO THE LOCATING PIN WHEN YOU APPLY THE TORQUE.

(1) Put the contactor (3) on the tapped barrels (6) of the contactor base (5).
(2) TORQUE the captive screws (2) to between 41.6 and 33.63 lbf.in (0.47 and 0.38 m.daN )

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

Subtask 24-38-55-420-051-A

B. Connect the Two Batteries
(1) Connect the electrical connectors to the batteries, refer to (Ref. AMM TASK 24-38-51-400-001).

Subtask 24-38-55-710-050-A

C. Operational Test of the Battery Charge Limiter (BCL)
(1) Do an operational test of the BCL from the CFDS (Ref. AMM TASK 24-38-00-710-001).

Subtask 24-38-55-750-050-B

D. Adjustment of the Clock
(1) FOR [2PB1] (BAT-1)
Adjust the clock (Ref. AMM TASK 31-21-00-750-002).

5. Close-up
Subtask 24-38-55-410-050-B

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the WARNING NOTICE(S).
(3) Close the avionics compartment doors 812 and 822.
(4) Close the access door 121AL.
(5) Remove the access platform(s).

[Rev.10 from 2021] 2026.03.31 23:24:01 UTC