Removal of the Power Supply Unit

TASK 33-48-38-000-001-A
Removal of the Power Supply Unit

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

FIN: 14LV
FIN: 15LV

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 4M (13 FT)
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [14LV] (PSU)
634AB
FOR [15LV] (PSU)
534AB

C. Referenced Information

REFERENCE	DESIGNATION
Power Supply Unit

3. Job Set-up
Subtask 33-48-38-941-052-A

A. Safety Precautions
(1) Put the SAFETY BARRIER(S) in position.
(2) Put a WARNING NOTICE(S) in position on panel 25VU to tell persons not to operate the strobe lights or the navigation lights.

Subtask 33-48-38-865-050-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
122VU	LIGHTING/WING/STROBE	10LV	V05

Subtask 33-48-38-010-050-A

C. Get Access
(1) Put the ACCESS PLATFORM 4M (13 FT) in position below the applicable access panel 534AB(634AB).
(2) Remove the applicable access panel:
(a) FOR [15LV] (PSU)
remove 534AB.
(b) FOR [14LV] (PSU)
remove 634AB.

4. Procedure
Subtask 33-48-38-020-050-A

A. Removal of the Power Supply Unit

WARNING: DO NOT DISCONNECT THE ELECTRICAL CONNECTIONS FOR AT LEAST 2 MINUTES AFTER YOU DE-ENERGIZE THE ELECTRICAL CIRCUITS.

(1) Disconnect the electrical connectors (1) from the power supply unit (4).
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Remove the bolts (3) and the washers (2).

NOTE: The power supply unit has two location pins. They engage in the location pin sockets of the wing tip.

(4) Carefully remove the power supply unit (4).

[Rev.10 from 2021] 2026.04.01 00:56:45 UTC