Installation of the Power Supply Unit

TASK 33-48-36-400-001-A
Installation of the Power Supply Unit

FIN: 3LV

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	STEPLADDER 1.5 M (5 FT)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.04QAB2)	Coating_- Flexible Structure
No specific	lockwire - corrosion resistant steel 0.6mm (0.24 in.) dia.

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
241CC

D. Referenced Information

REFERENCE	DESIGNATION
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
TASK 25-23-41-400-001-A	Installation of the Ceiling Panels
TASK 33-48-00-710-001-A	Operational Test of the Anti-Collision Lighting
Power Supply Unit 3LV

3. Job Set-up
Subtask 33-48-36-860-051-A

A. Aircraft Maintenance Configuration
(1) Make sure that switch 2LV BEACON ON-OFF on overhead panel 25VU is in the OFF position.
(2) Make sure that switch 4WL EMER EXIT LT OFF-ARM-ON on overhead panel 25VUis in the OFF position.
(3) Make sure that the pushbutton EMERG LIGHT on the Forward Attendant Panel (FAP) is in the released position.
(4) Make sure that the STEPLADDER 1.5 M (5 FT) is in position at the applicable location.
(5) Make sure that center ceiling panel 241CC is removed.

Subtask 33-48-36-865-051-A

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
122VU	LIGHTING/EXT LT/BEACON/UPPER	1LV	U06

4. Procedure
Subtask 33-48-36-420-050-A

A. Installation of the Power Supply Unit
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Put the power supply unit (1) in position on the fuselage.
(4) Install the washers (3) and the screws (4) and (6).
(5) Apply a thin layer of Coating_- Flexible Structure (Material No.04QAB2) on the screw (6) (Ref. AMM TASK 20-28-00-912-802).
(6) Remove the CAP-BLANKING from each electrical connector and receptacle.

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.

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTORS ARE CLEAN BEFORE YOU DISCONNECT OR CONNECT THEM. CONTAMINATION ON THE ELECTRICAL CONNECTORS CAN CAUSE DAMAGE TO EQUIPMENT.

(7) Connect the electrical connectors (2) and (5) to the power supply unit (1).

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

(8) Safety the electrical connector (5) with lockwire - corrosion resistant steel 0.6mm (0.24 in.) dia..

NOTE: It is not necessary to safety the connector with the lockwire, if it is a self-locking connector.

Subtask 33-48-36-865-052-A

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
122VU	LIGHTING/EXT LT/BEACON/UPPER	1LV	U06

Subtask 33-48-36-710-050-A

C. Do an operational test of the upper beacon/strobe light 7LV (Ref. AMM TASK 33-48-00-710-001).

5. Close-up
Subtask 33-48-36-410-050-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install center ceiling panel 241CC (Ref. AMM TASK 25-23-41-400-001).
(3) Remove the stepladder.

[Rev.10 from 2021] 2026.04.01 00:56:42 UTC