(2)  
SSM 33-28-04

 B. Access
 (1)  Location Zone
 200 Upper Half of Fuselage

 C. Lamp Replacement
 S 862-012
 (1)  Do one of these steps to remove electrical power from the sidewall light:
 (a)  
At the attendant's panel, set the switch to the off position and attach the DO-NOT-OPERATE tag.

 (b)  
Open each applicable circuit breaker and attach the DO-NOT-CLOSE tag: 1) On the power distribution center panel, P414.

 S 032-015
 (2)  
SIDEWALL LIGHT WITH A LENS;
 Remove each fastener and remove the lens.

 S 962-013

 (3)  
Carefully replace the lamp.

 (a)  If the lamp has a cover or end cap, remove these parts and install them on the new lamp.
 S 432-016
 (4)  SIDEWALL LIGHT WITH A LENS;
 Install the lens with the fasteners.

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747-400 MAINTENANCE MANUAL
 D. Lamp Test
 S 862-017
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 862-018

 (2)  
Remove each DO-NOT-OPERATE or DO-NOT-CLOSE tag.

 (a)  Close each circuit breaker that was opened.
 S 712-023
 (3)  At the attendant's panel, set the switch for the sidewall light to the on position.
 (a)  Make sure the new lamp comes on correctly.
 S 862-026
 (4)  
Set the sidewall light to the usual mode.

 (5)
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 S 862-011
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747-400
MAINTENANCE MANUAL

SIDEWALL LIGHT
(EXAMPLE)

SIDEWALL LIGHT WITH A LENS
Upper Deck Sidewall Lights - Lamp ReplacementFigure 201
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747-400 MAINTENANCE MANUAL
 UPPER DECK SIDEWALL LIGHTS BALLAST - REMOVAL/INSTALLATION
_________________________________________________________
 1.  General_______
 A. This procedure has these tasks:
 (1)
Sidewall Light - Ballast Removal

 (2)
Sidewall Light - Ballast Installation

 TASK 33-28-04-004-001
 2.  Sidewall Light - Ballast Removal (Fig. 401)________________________________
 A. References
 (1)
AMM 25-21-02/401, Upper Deck Window Reveal and Shade

 (2)
SSM 33-28-04

 B. Access
 (1)  Location Zone
 200 Upper Half of Fuselage

 C. Ballast Removal
 (1)  S 864-002Open this circuit breaker and attach a DO-NOT-CLOSE tag: (a) P414 Power Distribution Center - Left 1) 414L17 UPR DK WNDW REVEAL LIGHT
 (2)  S 014-028BALLAST BEHIND THE SIDEWALL; Remove the window reveal (sidewall) panel (AMM 25-21-02/401).
 NOTE:____ The ballast is on the back side of the window reveal panel.
 (3)  S 014-022BALLAST ABOVE THE SIDEWALL LIGHT; Get access to the ballast: (a) Carefully remove the lamp from the applicable sidewall light. (b) Remove a screw from the base plate of the light assembly opposite the hinge.

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