33-28-00
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A
747-400 MAINTENANCE MANUAL
 UPPER DECK INDIRECT CEILING LIGHTS - MAINTENANCE PRACTICES
__________________________________________________________
 1.  General_______
 A.  This procedure contains the task that replaces the lamps in the indirect ceiling lights on the upper deck.
 B.  Ceiling panels on the upper deck have a light assembly installed at each end of the panel.
 C.  The fluorescent lamps can be replaced through the openings between the ceiling panel and reveal panel.
 TASK 33-28-01-962-001
 2.  Indirect Ceiling Light - Lamp Replacement_________________________________________
 A.  References
 (1)
24-22-00/201, Manual Control

 (2)
IPC 33-28-01

 (3)
SSM 33-28-09

 B.  Access
 (1)  Location Zone
 200 Upper Deck Ceiling Panels

 C.  Replacement Procedure
 S 862-011
 (1) Prepare for the lamp replacement:
 (a)
Supply electrical power (Ref 24-22-00/201):

 (b)
Identify the indirect ceiling lights that do not come on.

 (c)
Open this circuit breaker and attach a DO-NOT-CLOSE tag.

 1)  P414 Power Distribution Center Left a) 414H22 UPPER DECK CEILING LIGHT
 S 962-012
 (2) Replace the lamp:
 (a) Remove the defective lamp from the light assembly as follows:
 1)  Push the lamp longitudinally to compress the telescopic end.
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747-400 MAINTENANCE MANUAL
 2)  When the opposite lamp end is clear of the lamp holder, remove the lamp.
 (b)  Install the lamp into the light assembly as follows: 1) Put one end of the new lamp into the telescopic lamp holder end. 2) Push longitudinally on the lamp to compress the telescopic
 end. 3) Install the opposite lamp end into the lamp holder.
 S 712-013
 (3)  Do a test of the lamp:
 (a)
Close this circuit breaker and remove the DO-NOT-CLOSE tag.

 1)  P414 Power Distribution Center
 a) 414H22 UPPER DECK CEILING LIGHT

 (b)  
Make sure the lamp comes on.

 S 862-010
 (4)  Remove the electrical power if it is not necessary (Ref 24-22-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
747-400
MAINTENANCE MANUAL

INDIRECT LIGHT (EXAMPLE)
SEE A
UPPER DECK PASSENGER COMPARTMENT
CEILING PANEL (REF)
FLUORESCENT LIGHT
INDIRECT CEILING LIGHT (EXAMPLE)
A
Upper Deck Indirect Ceiling Lights - Component Location
Figure 201

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 33-28-01
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A
747-400 MAINTENANCE MANUAL
 INDIRECT CEILING LIGHTS BALLAST - REMOVAL/INSTALLATION
______________________________________________________
 1.  General_______
 A.  This procedure contains these tasks:
　
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