Replacement of the Halogen Bulb of the Landing Light

TASK 33-42-11-960-001-A
Replacement of the Halogen Bulb of the Landing Light

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.

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: WEAR GLASSES AND PROTECTIVE CLOTHING WHEN YOU DO WORK ON THE LIGHT. THE LAMP IS PRESSURIZED AND AN EXPLOSION CAN OCCUR.

WARNING: MAKE SURE THAT THERE ARE NO SIGNS OF FUEL CONTAMINATION IN THE LANDING LIGHT ASSEMBLY. IF YOU FIND FUEL CONTAMINATION, NO PERSON MUST OPERATE THE LANDING LIGHT UNTIL:

YOU REPAIR THE FUEL LEAK
YOU REPLACE THE LANDING LIGHT ASSEMBLY.

IF YOU DO NOT OBEY THIS PRECAUTION, IGNITION OF THE REMAINING FUEL IN THE LANDING LIGHT CAN OCCUR.

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

CAUTION: WHEN YOU REPLACE A LANDING LIGHT BULB, EXAMINE THE APPLICABLE LANDING LIGHT ASSEMBLY FOR SIGNS OF FUEL CONTAMINATION. IF YOU FIND FUEL CONTAMINATION, EXAMINE THE ITEMS THAT FOLLOW FOR SIGNS OF FUEL LEAKAGE:

THE FUEL PUMP(S) 21QA(26QA) OR 25QA(22QA)
THE WATER DRAIN VALVE 25QM(26QM) DIRECTLY FORWARD OF THE LANDING LIGHT ASSEMBLY.

REFER TO AMM 28-11-00-06 FOR LEAKAGE LIMITS AND REPAIR AS NECESARY. IF YOU DO NOT REPAIR THE LEAK, NO PERSONS MUST OPERATE THE APPLICABLE LANDING LIGHT UNTIL:

THE LEAK IS REPAIRED.
THE LANDING LIGHT ASSEMBLY IS REPLACED.

ZONE: 571
ZONE: 671

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 1M(3 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.08BBD1)	Non Aqueous Cleaner-- Isopropyl Alcohol -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
571	MLG BAY
671	MLG BAY

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
3	BULB	AIPC 33-46-11-02-050

E. Referenced Information

REFERENCE	DESIGNATION
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 28-11-00-280-002-A	Structural Fuel Tank Leaks - General Information
TASK 28-11-41-000-003-A	Removal of the Water Drain Valve
TASK 28-21-51-000-001-A	Removal of the Fuel Pumps
TASK 33-42-00-710-001-A	Operational Test of the Landing Lights
Halogen Bulb of the Landing Light - Location and Details
Distance between the Clamp Tabs

3. Job Set-up
Subtask 33-42-11-941-057-A

A. Safety Precautions
(1) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(2) Put a WARNING NOTICE(S) in the cockpit to tell persons not to operate the landing lights.

Subtask 33-42-11-010-052-A

B. Get Access
(1) Put an ACCESS PLATFORM 1M(3 FT) below the applicable landing light, zone 571 (671).

Subtask 33-42-11-860-056-A

C. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) Extend the landing light:
(a) In zone 571 (671), make sure that the travel range of the landing light is clear.
(b) In the cockpit, on the lighting panel 25VU, set the LAND L (R) switch to OFF.
(c) Make sure the landing light extends.
(3) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

Subtask 33-42-11-865-059-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
122VU	LIGHTING/LANDING LT/R/CTL	4LB	T07
122VU	LIGHTING/LANDING LT/R/SPLY	2LB	T06
122VU	LIGHTING/LANDING LT/L/CTL	3LB	T05
122VU	LIGHTING/LANDING LT/L/SPLY	1LB	T04

4. Procedure
Subtask 33-42-11-210-060-A

A. Examine the Landing Light Assembly for Fuel Contamination
(1) Examine the landing light assembly for signs of fuel contamination.
(2) If you find fuel contamination, examine the items that follow for fuel leakage:

the fuel pumps 21QA(26QA) and 25QA(22QA) (Ref. AMM TASK 28-21-51-000-001)
the water drain valve 25QM(26QM) (Ref. AMM TASK 28-11-41-000-003)
the wing tank structure (Ref. AMM TASK 28-11-00-280-002).

Repair the leak(s) as necessary.

Subtask 33-42-11-020-053-A

B. Removal of the Halogen Bulb

Halogen Bulb of the Landing Light - Location and Details

WARNING: WEAR GLASSES AND PROTECTIVE CLOTHING WHEN YOU DO WORK ON THE LIGHT. THE LAMP IS PRESSURIZED AND AN EXPLOSION CAN OCCUR.

CAUTION: DO NOT TOUCH THE LAMP GLASS WITH YOUR FINGERS. THE OILS FROM YOUR SKIN WILL QUICKLY CAUSE DETERIORATION OF THE LAMP. IF YOU ACCIDENTALLY TOUCH THE LAMP GLASS, CLEAN IT WITH A LINT- FREE CLOTH. IF NECESSARY, MAKE THE CLOTH MOIST WITH WATER. DRY WITH LOW-PRESSURE COMPRESSED AIR JET. DO NOT USE ALCOHOL.

CAUTION: USE ONLY CLEAN, LINT-FREE GLOVES WHEN YOU TOUCH THE BULB AND THE MIRROR.

(1) Loosen the screw (5).
(2) Remove the clamp (6).
(3) Pull the lens (7) away from the mirror (2).

NOTE: Put adhesive tape to hold the mirror (2) in position on the lamp housing (1).

(4) Remove the two screws (8) and the two washers (9).
(5) Carefully remove and discard the halogen bulb (3).

Subtask 33-42-11-420-054-A

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

Subtask 33-42-11-420-056-A

D. Installation of the Halogen Bulb

WARNING: WEAR GLASSES AND PROTECTIVE CLOTHING WHEN YOU DO WORK ON THE LIGHT. THE LAMP IS PRESSURIZED AND AN EXPLOSION CAN OCCUR.

CAUTION: USE ONLY CLEAN, LINT-FREE GLOVES WHEN YOU TOUCH THE BULB AND THE MIRROR.

CAUTION: USE ONLY THE SUPPLIED HANDLING TOOL TO INSTALL THE BULB. RETAIN THE HANDLING TOOL AFTER BULB INSTALLATION.

(1) Carefully put a new halogen AIPC 33-46-11-02-050 BULB (3) in position.

NOTE: Make sure that the pinched seal (4) end points forward.

(2) Install the two washers (9) and the two screws (8).
(a) Tighten the two screws (8) carefully until they touch the halogen bulb (3) attachment brackets.
(b) Apply one more quarter turn to the two screws (8).
(3) Remove the adhesive tape from the mirror (2).
(4) Use a clean Textile-Lint free Cotton - (Material No.14SBA1) , made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) to clean the component interface and/or the adjacent area.
(5) Clean the surface of the lens (7) with Non Aqueous Cleaner-- Isopropyl Alcohol - (Material No.08BBD1) made moist with warm soap solution.
(6) Dry the surface of the lens (7) with a clean Textile-Lint free Cotton - (Material No.14SBA1) .
(7) Put the lens (7) in position on the mirror (2).
(8) Put the clamp (6) in position.

NOTE: Examine the clamp (6). If it is twisted, replace it.

(9) Install the screw (5).

CAUTION: DO NOT USE THE BULB HANDLING TOOL TO TIGHTEN THE CLAMP SCREW. DAMAGE CAN OCCUR TO THE COMPONENTS IF THE BULB HANDLING TOOL BREAKS. USE THE CORRECT TOOL TO TIGHTEN THE CLAMP SCREW.

(10) Tighten the screw (5) until the screw head touches the clamp tab.

Distance between the Clamp Tabs

(11) The distance between the two clamp (6) tabs is 10 mm (0.3937 in.) +/- 0.2 mm (0.0079 in.).

NOTE: You can use the bulb handling tool gage to measure the distance between the clamp tabs.

Subtask 33-42-11-865-060-A

E. 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/LANDING LT/R/CTL	4LB	T07
122VU	LIGHTING/LANDING LT/R/SPLY	2LB	T06
122VU	LIGHTING/LANDING LT/L/CTL	3LB	T05
122VU	LIGHTING/LANDING LT/L/SPLY	1LB	T04

Subtask 33-42-11-710-053-A

F. Operational Test
(1) Do the operational test of the landing light (Ref. AMM TASK 33-42-00-710-001).

5. Close-up
Subtask 33-42-11-860-054-A

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) Retract the landing light:
(a) In zone 571 (671), make sure that the travel range of the landing light is clear.
(b) In the cockpit, on the lighting panel 25VU, set the LAND L (R) switch to RETRACT.
(c) Make sure the landing light retracts.
(3) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

Subtask 33-42-11-942-053-A

B. Removal of Equipment
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the SAFETY BARRIER(S).
(3) Remove the WARNING NOTICE(S).
(4) Remove the access platform(s).
(5) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.9 from 2019] 2026.04.01 00:55:25 UTC