Removal of the Essential 115/26VAC Autotransformer

TASK 24-52-51-000-001-A
Removal of the Essential 115/26VAC Autotransformer

ZONE: 125
FIN: 5XH

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	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
125	LATERAL AVIONIC COMPARTMENT
812

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
AutoTransformer

3. Job Set-up
Subtask 24-52-51-861-051-A

A. Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).

Subtask 24-52-51-010-050-A

B. Get access to the avionics compartment.
(1) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE at the access door 812 to get access to the avionics compartment.
(2) Open the access door 812.
(3) Open the access panel of the AC/DC emergency power center 106VU.

Subtask 24-52-51-865-050-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
106VU	26VAC/ESS BUS/SPLY	4XH	B06

4. Procedure
Subtask 24-52-51-020-050-A

A. Removal of the Autotransformer
(1) Disconnect the electrical connector (3).
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Loosen the 4 screws (4).
(4) Hold the transformer (1).
(5) Remove the screws (4) and the washers (5).
(6) Remove the transformer (1).

[Rev.10 from 2021] 2026.03.31 23:24:57 UTC