Installation of the Flash Tube Assembly of the Lower Beacon Light

TASK 33-48-12-400-002-A
Installation of the Flash Tube Assembly of the Lower Beacon Light

WARNING: ISOLATE THE ELECTRICAL CIRCUITS FROM THE RELATED EQUIPMENT AND THE ENVIRONMENT.

WARNING: DO NOT TOUCH THE STROBE LIGHTS FOR AT LEAST 5 MINUTES AFTER OPERATION. THE STROBE LIGHT WILL STILL BE HOT.

WARNING: DO NOT REMOVE THE STROBE LIGHT FOR AT LEAST TEN MINUTES AFTER YOU DE-ENERGIZE THE ELECTRICAL CIRCUITS. THE HIGH VOLTAGE ELECTRICAL CURRENT IN THE CAPACITOR OF THE STROBE LIGHT IS DANGEROUS.

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

ZONE: 190
FIN: 6LV ** ON A/C NOT FOR ALL

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 1.0 M (3.3 FT)
No specific	1	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.05BAA1)	Threadlocking Adhesive-- Low strength -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
190	BELLY FAIR, AIR CONDITIONING & HYD COMPT

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
6	SEAL	AIPC 33-48-12-01-030
5	SEAL	AIPC 33-48-12-02-030

E. Referenced Information

REFERENCE	DESIGNATION
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
TASK 20-28-00-912-803-A	Bonding Surface Preparation
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 33-48-00-710-001-A	Operational Test of the Anti-Collision Lighting
Flash Tube Assembly of the Lower Beacon Light ** ON A/C NOT FOR ALL
Flash Tube Assembly of the Lower Beacon Light ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 33-48-12-861-055-A ** ON A/C NOT FOR ALL

A. Make sure that the aircraft electrical circuits are energized.
(Ref. AMM TASK 24-41-00-861-002)

Subtask 33-48-12-941-051-A ** ON A/C NOT FOR ALL

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

Subtask 33-48-12-860-053-A ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration
(1) Make sure that the parts retained from the removed component are clean and in the correct condition.
(2) Make sure that switch 2LV BEACON ON-OFF on overhead panel 25VU is in the OFF position.
(3) Make sure that the STEPLADDER 1.0 M (3.3 FT) is in position below the related panel.

Subtask 33-48-12-865-057-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
122VU	LIGHTING/EXT LT/BEACON/LOWER	5LV	U03

4. Procedure
Subtask 33-48-12-420-051-A ** ON A/C NOT FOR ALL

A. Installation of the Flash Tube Assembly of the Lower Beacon/Strobe Light 6LV
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Remove the blanking caps from the electrical connectors.

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.

(4) Connect the electrical connectors (7) to the light assembly (8).
(5) Put the flash tube assembly (6) on the light assembly (8).
(6) Apply Threadlocking Adhesive-- Low strength - (Material No.05BAA1) to the threads of the countersunk screws (1).
(7) Loosely install the countersunk screws (1).
(8) Tighten the countersunk screws (1) in the correct sequence.
(9) Make sure that the bung (3) is removed from the lens (4) to drain the condensation.
(10) Install the lens (4) with the seal (5):
(a) Make sure that the seal (5) is in good condition.
(b) If necessary install the new AIPC 33-48-12-02-030 SEAL (5).
(11) Loosely install the countersunk screws (2).
(12) Tighten the countersunk screws (2) in the correct sequence.

Subtask 33-48-12-420-051-GK ** ON A/C NOT FOR ALL

A. Installation of the Flash Tube Assembly of the Lower Beacon/Strobe Light
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Prepare the surface of the bonding point(s)
(Ref. AMM TASK 20-28-00-912-803).
(4) Remove the blanking caps from the electrical connectors.

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.

(5) Connect the electrical connectors (9).
(6) Put the flash tube assembly (8) and the faraday cage (7) in their correct installation positions, on the light assembly (10).
(7) Make sure that the countersunk screws (2) are loosely installed.
(8) Tighten the countersunk screws (2) in the correct sequence.
(9) Do the electrical resistance measurement and the final protection of the bonding point(s)
(Ref. AMM TASK 20-28-00-912-802).
(10) Make sure that you remove the plug (4) from the lens (5) to drain the condensation.
(11) Install the lens (5) with the seal (6):
(a) Make sure that the seal (6) is in good condition.
(b) If necessary, install a new AIPC 33-48-12-01-030 SEAL (6).
(12) Make sure that the countersunk screws (3) are loosely installed.
(13) Tighten the countersunk screws (3) in the correct sequence.
(14) Do the electrical resistance measurement and the final protection of the bonding point(s)
(Ref. AMM TASK 20-28-00-912-802).

Subtask 33-48-12-865-058-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
122VU	LIGHTING/EXT LT/BEACON/LOWER	5LV	U03

Subtask 33-48-12-710-053-A ** ON A/C NOT FOR ALL

C. Operational Test
(1) Do the operational test of the lower beacon/strobe light (6LV) (Ref. AMM TASK 33-48-00-710-001).

5. Close-up
Subtask 33-48-12-410-052-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.

Subtask 33-48-12-862-051-A ** ON A/C NOT FOR ALL

B. De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

Subtask 33-48-12-942-050-A ** ON A/C NOT FOR ALL

C. Removal of Equipment
(1) Remove the WARNING NOTICE(S).
(2) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.02 06:22:50 UTC