33-26-07
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A 747-400 MAINTENANCE MANUAL
(3) S 714-048At the P8 panel, set the SEAT BELTS switch to the on position. (a) Make sure the RETURN TO SEAT sign comes on correctly.
(4) S 864-049Set the switch to the off position.
(5) S 864-050Remove electrical power if it is not necessary (AMM 24-22-00/201).
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33-26-07
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A
747-400 MAINTENANCE MANUAL
GALLEY LIGHTS - DESCRIPTION AND OPERATION
_________________________________________
1. General_______(Fig. 1)
A. The upper deck galley area lighting is provided by fluorescent lights installed in the ceiling above the galley and a fluorescent light installed above the galley worktable. Relamping is easily accomplished by removing the lens from the fluorescent light panels.
B. The upper deck galley ceiling lights use ground service transfer bus 115-volt ac. The upper deck galley ceiling lights are controlled by a 3-position (OFF, DIM, BRIGHT) switch in the upper deck galley control panel. The galley light control panel switch controls the solid state ballasts outputs. With the switch in the DIM position the ballasts provide a reduced current output less than the lamp-rated current which allows a fixed lower level of illumination. With the switch in the BRIGHT postion, the ballasts provide a current output at the lamp-rated current which allows a full illumination.
C. For more data about this lighting system, refer to these sources:
(1)
SSM 33-27-01 thru 33-27-99
(2)
WDM 33-27-11 thru 33-27-99
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33-27-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
LAVATORY
SEE
LIGHT SWITCHES
GALLEY
(FRONT)
A
Galley Lights
Figure 1
E47369
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33-27-00
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A
747-400 MAINTENANCE MANUAL
UPPER DECK GALLEY LIGHTS - MAINTENANCE PRACTICES
________________________________________________
1. General_______
A. This procedure has these tasks:
(1)
Galley Light - Lamp Replacement
(2)
Galley Light - Ballast Removal
(3)
Galley Light - Ballast Installation
TASK 33-27-07-962-050
2. Galley Light - Lamp Replacement_______________________________
A. References
(1)
AMM 24-22-00/201, Manual Control
(2)
SSM 33-27-01
B. Access
(1) Location Zone
200 Upper Half of Fuselage
C. Replacement Procedure
S 862-044
(1)
Supply electrical power (AMM 24-22-00/201).
S 862-046
(2)
Do one of these steps to remove electrical power from the galley light:
(a)
Set the switch for the galley light 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 962-028
(3) Do the Lamp Replacement:
(a)
For ceiling panel lights, get access to the lamp through the opening at the panel end.
(b)
For galley (work) lights, get access to the lamp by the removal of the lens from the panel.
