33-46-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 AREA LIGHTS - MAINTENANCE PRACTICES
___________________________________
 1.  General
_______
 A.  This procedure contains a task for the replacement of the lamps in the area lights.
 TASK 33-46-00-962-001
 2.  Lamp Replacement (Fig. 201)
________________
 A.  References
 (1)  
24-22-00/201, Manual Control

 (2)  
SSM 33-37-30

 B.  Access
 (1)  Location Zone
 100 Lower Cargo Doors

 C.  Procedure
 S 212-002
 (1)  
Identify the lamp to be replaced.

 S 862-003

 (2)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P414 Power Distribution Center Panel - Left 1) 414C25 FWD CARGO LT

 (b)  
P59 Aft Lower Cargo Equipment Panel
 1) EXT CARGO AREA LIGHTS

 S 032-023
 (3)  Remove the lens coverplate.
 (a)  Remove the screws from the outer edge of the lens coverplate.
 NOTE: Do not remove the screws from the inner edge of the lens
____
 coverplate.

 (b) Lift the lens coverplate away from the fuselage.
 NOTE: Do not remove the strap from the lens coverplate.
____
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 33-46-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

Area Light Lamp Replacement
Figure 201

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 S 962-024
 (4)  Do these steps to replace the lamp:
 (a)  
Remove the screws on the retainer ring.

 (b)  
Remove the retainer ring.

 (c)  
Carefully lift the lamp from the housing to get access to the wires behind the lamp.

 (d)  
Disconnect the wires from the lamp.

 (e)  
Remove the lamp from the housing.

 (f)  
Attach the wires to the replacement lamp.

 CAUTION: WHEN YOU INSTALL THE LAMP, MAKE SURE IT IS CORRECTLY
_______ ALIGNED AGAINST THE RETAINING RING. THE LAMP CAN BREAK IF YOU DO NOT INSTALL IT CORRECTLY.
 (g)  
Put the lamp in the housing.

 (h)  
Replace the retainer ring.

 (i)  
Install the screws in the retainer ring.

 S 432-013
 (5)  Install the lens coverplate.
 (a)  
Hold the lens coverplate in its position.

 (b)  
Install the screws on the outer edge of the lens coverplate.

 S 712-026
 (6)  Do these steps to do a test of the replacement lamp:
 (a)  
Supply electrical power (Ref 24-22-00/201).

 (b)  
Remove the DO-NOT-CLOSE tags and close these circuit breakers: 1) P414 Power Distribution Center Panel - Left a) 414C25 FWD CARGO LT

 2)  P59 Aft Lower Cargo Equipment Panel
 a) EXT CARGO AREA LIGHTS

 (c)
Put the applicable switch for the replacement lamp to ON.

 NOTE: The switches for the area lights can be found adjacent
____
 to the cargo doors.

 (d)  
Make sure the lamp comes on.

 (e)  
Put the applicable switch for the replacement lamp to OFF.

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