Installation of the Power Supply Unit

TASK 33-48-38-400-001-A
Installation of the Power Supply Unit

WARNING: MAKE SURE THAT THE FLIGHT CONTROL SAFETY-LOCKS AND THE WARNING NOTICES ARE IN POSITION.

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

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

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

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

D. Referenced Information

REFERENCE	DESIGNATION
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
TASK 33-48-00-710-002-A	Operational Test of the Anti-Collision/Strobe Lighting
Power Supply Unit

3. Job Set-up
Subtask 33-48-38-941-053-A

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

Subtask 33-48-38-865-051-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/WING/STROBE	10LV	V05

Subtask 33-48-38-860-050-A

C. Aircraft Maintenance Configuration
(1) Make sure that the ACCESS PLATFORM 4M (13 FT) is position below the applicable power suppply unit.
(2) Make sure that the access panels 534AB (634AB) are removed.

4. Procedure
Subtask 33-48-38-420-051-A

A. Preparation for Installation
(1) Clean the component interface and/or the adjacent area with a clean Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
(2) Make sure that the parts retained from the removed component are clean and in the correct condition.
(3) Do an inspection of the component interfaces and the adjacent area.

Subtask 33-48-38-420-050-A

B. Installation of the Power Supply Unit
(1) Carefully install the power supply unit (4), and make sure that the location pins are correctly engaged in their sockets.
(2) Attach the power supply unit (4) with the bolts (3) and the washers (2).
(3) Electrically bond the applicable bolt (3) (Ref. AMM TASK 20-28-00-912-802):

for the left wing bond the inboard bolt (3)
for the right wing bond the outboard bolt (3).

(4) Remove the blanking caps from the disconnected electrical connectors.
(5) Connect the electrical connectors (1) to the power supply unit.

Subtask 33-48-38-865-052-A

C. 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/WING/STROBE	10LV	V05

Subtask 33-48-38-710-050-A

D. Test

WARNING: DO NOT LOOK DIRECTLY AT THE LIGHT FLASH DURING THE TEST. SUPPLY A COVER, OR SHIELD, TO GIVE PROTECTION FROM THE LIGHT FLASH TO PERSONS IN THE TEST AREA.

(1) Do an operational test of the strobe light (Ref. AMM TASK 33-48-00-710-002)

Subtask 33-48-38-865-053-A

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

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

5. Close-up
Subtask 33-48-38-410-050-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the applicable access panel:
(a) FOR [15LV] (PSU)
534AB
(b) FOR [14LV] (PSU)
634AB.

NOTE: The access panels are installed with the drain holes in the inboard direction.

Subtask 33-48-38-865-054-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/WING/STROBE	10LV	V05

Subtask 33-48-38-942-052-A

C. Removal of Equipment
(1) Remove the safety barriers.
(2) Remove the WARNING NOTICE(S).
(3) Remove the access platform(s).
(4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.01 00:56:46 UTC