S 864-043

 (3)  
Supply electrical power to the light.

 (a)  Remove each DO-NOT-OPERATE or DO-NOT-CLOSE tag. 1) Close each circuit breaker that was opened.
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747-400 MAINTENANCE MANUAL
 LOWER ANTI-COLLISION LIGHT - MAINTENANCE PRACTICES
__________________________________________________
 1.  General
_______
 A.  This procedure contains a task for the replacement of the lamp in the lower anti-collision light.
 TASK 33-44-03-962-001
 2.  Lamp Replacement (Fig. 201)
________________
 A.  Consumable Materials
 (1)  
A00247 Sealant - Chromate, BMS 5-95, Class B or C

 (2)  
G01043 Cloth - Lint Free

 B.  References
 (1)  
24-22-00/201, Manual Control

 (2)  
IPC 33-44-03

 (3)  
SSM 33-44-01

 C.  Access
 (1)  Location Zone
 100 Exterior Fuselage - Lower Half

 D.  Procedure
 S 862-018
 (1)  Open this circuit breaker and attach a DO-NOT-CLOSE tag:
 (a)  P6 Main Power Distribution Panel
 1) 6L31 ANTI COLL LTS - RED

 S 022-038
 WARNING: DO NOT TOUCH THE LIGHT ASSEMBLY FOR 10 MINUTES AFTER YOU REMOVE
_______ POWER. AN ELECTRICAL SHOCK FROM THE HIGH VOLTAGE IN THE LIGHT CAN CAUSE INJURY TO PERSONS.
 (2)  Do these steps to replace the lamp:
 (a)  
Remove the lens retaining screws.

 (b)  
Remove the lens.

 (c)  
Remove these parts from the light subassembly: 1) The screw.

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747-400
MAINTENANCE MANUAL

LOWER ANTI-COLLISION LIGHT

Lower Anti-Collision Light Lamp Replacement
Figure 201

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G47682
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747-400 MAINTENANCE MANUAL
 2) The lock washer.
 3) The reflector.
 4) The retaining ring.

 (d)  
Remove the lamp from the light subassembly.

 CAUTION:_______DO NOT LET YOUR FINGERS TOUCH THE LAMP. FINGER OILS ON THE LAMP WILL CAUSE LAMP FAILURE.

 (e)  
Hold the replacement lamp with a clean dry cloth.

 (f)  
Push the replacement lamp into the light subassembly.

 (g)  
Install these parts in the light subassembly:
 1) The retaining ring.
 2) The reflector.
 3) The lock washer.
 4) The screw.

 (h)  
Before you install the lens assembly, use the sealant (BMS 5-95, Class B or C) to apply a seal between the lens assembly and the skin panel (AMM 51-31-01/201).

 (i)  
Put the lens in its position on the airplane skin.

 (j)  
Install the lens retaining screws.

 S 712-022
 (3)  Do a test of the light:
 (a)
Remove the DO-NOT-CLOSE tag and close this circuit breaker:

 1)  P6 Main Power Distribution Panel
 a) 6L31 ANTI COLL LTS - RED

 (b)  
Supply electrical power (Ref 24-22-00/201).

 WARNING: DO NOT LET THE STROBE LIGHT FLASH DIRECTLY IN YOUR EYES.
_______ THE INTENSITY OF THE STROBE LIGHT WILL CAUSE DAMAGE TO YOUR EYES.
　
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