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 33-43-01
 ALL  ú ú 01 Page 202 ú Feb 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (b)  P6 Power Distribution Panel
 1) 6L30 NAV LTS-TAIL

 S 012-044
 (3)  Get access to the lamp:
 (a)  
Loosen the fasteners (4) that hold the lens (3).

 (b)  
Remove the lens (3) from the light assembly (1).

 (c)  
Let the lens assembly hang from its lanyard.

 (d)  
Loosen the lamp retainer screws (7) on the lampholder assembly, and turn the lamp retainers (6).

 S 962-045
 (4)  Replace the lamp:
 (a)  
Remove the lamp (5) from the light assembly (1).

 (b)  
Make sure the terminals that engage the lamp are not dirty.

 NOTE: If the terminals are dirty, clean them to make a good
____
 electrical connection.

 (c)  Use a lint free cloth to hold the lamp (5) and make sure the lamp is clean.
 NOTE: If the lamp is dirty, use an acetone solvent on a lint
____
 free cloth to clean the lamp.

 CAUTION:_______DO NOT LET YOUR FINGERS TOUCH THE LAMP. OILS FROM THE SKIN CAN CAUSE AN EXPLOSION OF THE LAMP WHEN IT IS HOT.
 (d)  
Hold the lamp with a lint free cloth and push the lamp in its position.

 (e)  
Turn the lamp retainers (6) into their position above the lamp ends and tighten the lamp retainer screws (7).

 (f)  
Hold the lamp with a lint free cloth and apply approximately 2 pounds of force away from the reflector.

 (g)  
Make sure the lamp does not change its position with the force applied.

 NOTE: If the lamp does change its position , tighten the
____ lampholder or replace the light assembly.
 (h)  
Clean the lens (3) with a lint free cloth, and put it in its position.

 (i)  
Tighten the lens assembly fasteners (4).

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

 1)  P6 Power Distribution Panel
 a) 6L30 NAV LTS-TAIL

 S 712-046
 (5)  Do a test of the tail navigation light:
 (a)  Supply electrical power (Ref 24-22-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 33-43-01
 ALL  ú ú 01 Page 203 ú Feb 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (b)  
Put the NAV switch on the P5 panel to the ON position.

 (c)  
Make sure the tail navigation light is on.

 (d)  
Put the NAV switch on the P5 panel to the OFF position.

 F. Put the airplane back to its usual condition
 S 862-047
 (1)  
Remove the DO-NOT-OPERATE tag from the APU CONTROL switch on the P5 panel.

 S 862-048

 (2)
Remove the DO-NOT-CLOSE tag and close this circuit breaker:

 (a)  P83 Panel
 1) APU PRIMARY CONTROL

 S 862-024
 (3)  Remove electrical power if it is not necessary (Ref 24-22-00/201).
 TASK 33-43-01-002-025
 3.  Taillight Removal (Fig. 201)_________________
 A. References
 (1)  
24-22-00/201, Manual Control

 (2)  
IPC 33-43-00

 (3)  
SSM 33-43-10

 B. Access
 (1)  Location Zone
 300 Empennage - Tail Cone

 C. Procedure
 S 862-050
 (1)  Prepare to Remove the Light:
 WARNING:_______MAKE SURE THE APU IS OFF. THE APU EXHAUST CAN CAUSE INJURY TO PERSONS WHEN YOU DO MAINTENANCE AT THE TAIL CONE AREA.
 (a)  Put the APU CONTROL switch on the P5 panel to the OFF position and attach a DO-NOT-OPERATE tag.
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