Removal of the AC Shed Essential Bus Contactor

TASK 24-52-55-000-001-A
Removal of the AC Shed Essential Bus Contactor

ZONE: 125
FIN: 8XH

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

B. Work Zones and Access Panels

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

C. Referenced Information

REFERENCE	DESIGNATION
AC SHED ESS BUS Contactor

3. Job Set-up
Subtask 24-52-55-010-050-A

A. Get access to the avionics compartment.
(1) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the avionics compartment doors 812 and 822.
(2) Open the access doors 812 and 822.
(3) Open the access panels of the AC/DC emergency power center 106VU and the access panels of the BATTERY power center 105VU.

Subtask 24-52-55-865-050-A

B. 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	CSM/G /EV/MAN/SPLY	6XE	B04
106VU	AC/SHED/ESS BUS/CNTOR/CTL	1XH	C04
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

4. Procedure
Subtask 24-52-55-020-050-A

A. Removal of the Contactor
(1) Loosen the 3 captive screws (1).

NOTE: Do not remove the captive screws (1) and the spring washers from the contactor (2).

(2) Remove the contactor (2).

[Rev.10 from 2021] 2026.03.31 23:24:59 UTC