Removal of the Emergency Generator Line Contactor (EMER GLC)

TASK 24-24-55-000-001-A
Removal of the Emergency Generator Line Contactor (EMER 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: 125
FIN: 2XE

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	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
125	LATERAL AVIONIC COMPARTMENT
812, 822

C. Referenced Information

REFERENCE	DESIGNATION
Contactor

3. Job Set-up
Subtask 24-24-55-941-051-A

A. Safety Precautions
(1) In the cockpit, on the overhead panel 35VU, make sure that these pushbutton switches are released:

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

(2) In the cockpit, put a WARNING NOTICE(S) to tell persons not to operate the pushbutton switches on the overhead panels:

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

(3) Make sure that the external power connector is not connected to the aircraft receptable EXT PWR.
(4) Put a WARNING NOTICE(S) on the access door 121AL to tell persons not to connect the external power connector.

Subtask 24-24-55-010-050-A

B. Get access to the avionics compartment.
(1) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE at the avionics compartment doors 812 and 822.
(2) Open the access doors 812 and 822.

Subtask 24-24-55-865-050-A

C. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
105VU	ELEC/CSM/G /EV AUTO/SPLY	7XE	C01
106VU	ESS TR/SPLY	4PE	C01
122VU	ELEC/CNTOR/ESS/DC BUS/TIE	3PC	W26
123VU	AC ESS/BUS ON/BUS 1	1XC	AC12
123VU	AC ESS/BUS ON/BUS 2	2XC	AC01

Subtask 24-24-55-010-052-A

D. Get Access
(1) In the avionics compartment, remove the access panel (1) from the AC/DC emergency power center 106VU.

4. Procedure

CAUTION: MAKE MATCH MARKS ON ALL THE ELECTRICAL WIRES BEFORE YOU DISCONNECT THEM. INCORRECT CONNECTION OF WIRES WILL CAUSE DAMAGE TO EQUIPMENT.

Subtask 24-24-55-020-050-A

A. Removal of the Contactor
(1) Disconnect the wires (6) from the contactor (7).
(2) Remove the 6 screws (5) and washers (4).
(3) Remove the power supply wires (3).
(4) Loosen the 4 nuts (2).
(5) Hold the contactor (7).
(6) Remove the 4 nuts (2).
(7) Remove the contactor (7).

[Rev.10 from 2021] 2026.03.31 23:22:43 UTC