Operational Test of the Landing Lights

TASK 33-42-00-710-001-A
Operational Test of the Landing Lights

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: 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.

FIN: 7LB
FIN: 8LB

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	SAFETY BARRIER(S)
No specific	1	WARNING NOTICE(S)

B. 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)

3. Job Set-up
Subtask 33-42-00-941-051-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 position on the panel 25VU to tell persons not to operate the landing lights.

Subtask 33-42-00-861-050-A

B. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).

Subtask 33-42-00-865-050-A

C. Make sure that this(these) circuit breaker(s) is(are) closed:

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 33-42-00-710-050-A

A. Operational Test of the Landing Lights

CAUTION: DO NOT OPERATE THE RETRACTABLE LANDING LIGHT 7LB (8LB) FOR MORE THAN ONE MINUTE WHEN THE AIRCRAFT IS ON THE GROUND. THE LANDING LIGHT CAN BECOME DAMAGED IF IT OPERATES WITH NO AIRFLOW TO KEEP THE LIGHT UNIT COOL. MAKE SURE THAT THERE IS A MINIMUM PERIOD OF FIVE MINUTES BETWEEN EACH OPERATION, TO LET THE TEMPERATURE OF THE LIGHT UNIT DECREASE.

(1) Make sure that the travel range(s) of the applicable landing light(s) is(are) clear.
(2) Do this test:

NOTE: This test is for the left landing light. For the right landing light, use the indications in parenthesis.

ACTION	RESULT
On panel 25VU: 1.Set the LAND L(LAND R) switch to OFF.	At zone 571(671): the landing light extends fully in not more than 10 seconds.
2.Set the LAND L(LAND R) switch to ON.	the landing light comes on.
3.Set the LAND L(LAND R) switch to OFF.	the landing light goes off.
4.Set the LAND L(LAND R) switch to RETRACT.	the landing light retracts in not more than 10 seconds.
5.Set the LAND L(LAND R) switch to ON.	the landing light extends before the landing light is fully extended, the light comes on.
6.Set the LAND L(LAND R) switch to RETRACT.	the landing light retracts after the landing light starts to retract, the light goes off.

5. Close-up
Subtask 33-42-00-862-050-A

A. Aircraft Maintenance Configuration
(1) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

Subtask 33-42-00-942-051-A

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

[Rev.10 from 2021] 2026.04.01 00:55:18 UTC