(g)  
Disconnect the ground wire from the light subassembly.

 (h)  
Do these steps to replace the lamp: 1) Turn the light subassembly counterclockwise and pull it from the housing assembly.

 2)  Remove these parts from the light subassembly: a) The screw. b) The lock washer. c) The reflector. d) The retaining ring.
 3)  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.
 4)  Use a clean dry cloth to hold the replacement lamp and push it into the light subassembly.
 5)  Install these parts in the light subassembly: a) The retaining ring. b) The reflector. c) The lock washer. d) The screw.
 6)  Turn the light subassembly clockwise until it is locked
 into the light assembly. 7) Connect the ground wire to the light subassembly. 8) Connect the electrical connector to the light subassembly.
 S 712-019
 (2)  Do a test of the light:
 (a)  
Supply electrical power (Ref 24-22-00/201).

 (b)  
Remove the DO-NOT-CLOSE tag and close this circuit breaker:

 1)  P6 main power distribution panel
 a) 6L31 RED ANTI-COLLISION LTS

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

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747-400 MAINTENANCE MANUAL
 (c)  
Put the BEACON switch on the P5 panel in the BOTH position.

 (d)  
Make sure the light comes on.

 (e)  
Put the BEACON switch in the OFF position.

 (f)  
Make sure the light goes off.

 (g)  
Remove electrical power if it is not necessary
 (Ref 24-22-00/201).

 S 412-027
 (3)  Install the parts you removed to get access to the lamp:
 (a)  
Put the insulation back in its initial position.

 (b)  
On airplanes with an access panel,
 close the access panel in the ceiling panel.

 (c)  
On airplanes without an access panel,
 install the ceiling panel (Ref 25-22-03/401).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 UPPER ANTI-COLLISION LIGHT - REMOVAL/INSTALLATION
_________________________________________________
 1. General
________
 A. This procedure contains these tasks:
 (1)  
A task to remove the light assembly.

 (2)  
A task to install the light assembly.

 TASK 33-44-01-004-001
 2. Light Assembly Removal (Fig. 401)
______________________
 A. References
 (1)  
IPC 33-44-01 Fig. 2

 (2)  
SSM 33-44-01

 (3)  
25-22-03/401, Upper Deck Ceiling Panels

 B. Access
 (1)  Location Zone 200 Ceiling - Upper Deck Passenger Compartment
 C. Procedure
 S 864-002
 (1)  Open this circuit breaker and attach a DO-NOT-CLOSE tag.
 (a)  P6 Main Power Distribution Panel
 1) 6L31 RED ANTI-COLLISION LTS

 S 014-037
 (2)  Get access to the light as follows:
 (a)  Find the ceiling panel at station 568 (the fifth ceiling panel forward of the midrange lowered ceiling).
 NOTE: Some airplanes have a panel installed in the
____ ceiling panel to get access to the light.
 (b)  
On airplanes with an access panel, open the access panel in the ceiling panel.

 (c)  
On airplanes without an access panel, remove the ceiling panel (Ref 25-22-03/401).
　
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