Installation of the DC Bus 2 Contactor Module

TASK 24-61-58-400-002-A
Installation of the DC Bus 2 Contactor Module

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: 14PN ** ON A/C NOT FOR ALL

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	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 0.3 and 0.27 m.daN (26.55 and 23.89 lbf.in )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
121AL

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
14	LOCKING WASHERS	AIPC 24-61-08-03-020
14	LOCKING WASHERS	AIPC 24-61-88-03-020

D. Referenced Information

REFERENCE	DESIGNATION
TASK 24-32-55-400-001-A	Installation of the TR 1 and TR 2 Contactors and the TR 2/AC Service Bus Normal Supply Contactor
TASK 24-35-55-400-001-A	Installation of the Contactor
TASK 24-43-55-400-001-A	Installation of the DC Service Bus Ground Supply Contactor
TASK 24-61-55-400-001-A	Installation of the DC Service Bus Normal Supply Contactor
TASK 24-61-55-400-002-A	Installation of the DC Shed-Bus Normal-Supply Contactor
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
DC Bus 2 Contactor Module

3. Job Set-up
Subtask 24-61-58-010-052-A ** ON A/C NOT FOR ALL

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, make sure that the front panel on the bottom right side of the rear panel 120VU is removed.
(3) Make sure that an 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 24-61-58-860-052-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) Make sure that the external power connector is not connected to the aircraft external-power receptacle.
(2) Make sure that a WARNING NOTICE(S) is in position on the access door 121AL to tell persons not to connect the external power connector to the aircraft external-power receptacle.
(3) In the cockpit, on the ELEC panel 35VU, make sure that these pushbutton switches are released:

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

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

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

4. Procedure
Subtask 24-61-58-420-053-A ** ON A/C NOT FOR ALL

A. Installation of the DC Bus 2 Contactor Module (14PN)
(1) Put the contactor module (26) in position on its support.
(2) Install the new AIPC 24-61-08-03-020 LOCKING WASHERS (14) or AIPC 24-61-88-03-020 LOCKING WASHERS (14) and the screws (15).
(3) Tighten the screws (15).
(4) Install the protective plugs (16) on the screws (15).

Subtask 24-61-58-420-055-A ** ON A/C NOT FOR ALL

B. Installation of the Electrical Components

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) Installation of the busbar (8).
(a) Install the busbar (8) between the contactor modules 14PN and 13PN.
(b) Install the spacer (7).
(c) Install the fuse (3).
(d) Install the washers (2) and (9) and the screws (1) and (10).
(e) Tighten the screws (1) and (10).
(f) Put the electrical cable (6) in position on the contactor module (13PN).
(g) Install the new locking washer (5) and the nut (4).
(h) Tighten the nut (4).
(2) Connection of the electrical cables.
(a) Put the electrical cables (19), (18) and (17) in position on the contactor module (26).
(b) Install the washer (20) and the screw (21).
(c) TORQUE the screw (21) to between 0.3 and 0.27 m.daN (26.55 and 23.89 lbf.in )

.
(d) Put the electrical cables (11) in position on the contactor module (26).
(e) Install the washers (12) and the screws (13).
(f) TORQUE the screws (13) to between 0.3 and 0.27 m.daN (26.55 and 23.89 lbf.in )

.
(g) Put the electrical cables (22) and (23) in position on the contactor module (26).
(h) Install the washer (24) and the screw (25).
(i) Tighten the screw (25).
(j) Put the electrical cables (29) in position on the contactor module (26).
(k) Install the washers (28) and the screws (27).
(l) TORQUE the screws (27) to between 0.3 and 0.27 m.daN (26.55 and 23.89 lbf.in )

Subtask 24-61-58-420-054-A ** ON A/C NOT FOR ALL

C. Installation of the Contactors on the Contactor Module 14PN
(1) Install the contactor 5PU2 (Ref. AMM TASK 24-32-55-400-001).
(2) Install the contactor 1PC2 (Ref. AMM TASK 24-35-55-400-001).
(3) Install the contactor 8PN (Ref. AMM TASK 24-61-55-400-001).
(4) Install the contactor 10PN (Ref. AMM TASK 24-61-55-400-002).
(5) Install the contactor 3PX (Ref. AMM TASK 24-43-55-400-001).

5. Close-up
Subtask 24-61-58-410-051-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the front panel on the bottom right side of the rear 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] 2026.04.01 05:49:46 UTC