(2)
Set switch to OFF.
P. Raise ceiling panel to installed position pressing upper edge in outboard direction to clear support edge.
NOTE: Excess lengths of lanyard should be stowed along edge of ceiling panel so as to not wedge between panel and center support.
Q. Move panel inboard to push inboard edge into support and push up on outboard edge to lock both outboard latches.
R. Check that flaps along edges of ceiling panel are overlapping adjacent panels properly.
S. Close overhead stowage compartment beneath ceiling panel.
T. Remove electrical power if no longer required.
517
Feb 15/79 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 33-21-23 Page 203
CEILING LIGHTS - MAINTENANCE PRACTICES
EFFECTIVITY
Carry-All Compartment Interior
1. General
A. Fluorescent ceiling lights are mounted in the ceiling panels above the stowage bins. The ceiling panels are hinged on their lower outboard corners and swing down for lamp replacement. No special tools are required (Fig. 201).
2. Relamp Fluorescent Ceiling Lights (Fig. 201)
A. Provide electrical power.
B. Set light switch on forward attendant's panel to bright. Identify fluorescent ceiling light lamp(s) that requires replacement.
C. Set switch to OFF, and attach do-not-operate identifier.
WARNING: HIGH VOLTAGE IS USED FOR CEILING LIGHT OPERATION. FAILURE TO DISABLE CIRCUIT MAY CAUSE INJURY.
D. Open stowage bin adjacent to ceiling panel with lamp to be replaced. Lower ceiling panel and open storage compartment door (Ref 25-21-341, MP).
E. Support upper inboard edge of ceiling panel with one hand, reach through stowage bin opening with other, and push up on trigger of each outboard ceiling panel latch mechanism.
NOTE: For access to some fwd lowered ceiling lights, the center panel (or door) is opened to obtain access to ceiling light panel latches.
F. Press upper inboard edge of ceiling panel in outboard direction until free of center support channel and drop inboard edge of ceiling panel until lanyard is taut.
G. Disengage lamp housing cover by releasing fasteners and rotate cover to expose the lamp for replacement.
Feb 20/84 33-21-24 Page 201
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Ceiling Lights Relamping 518
33-21-24 Figure 201 Feb 15/78
Page 202
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
H. Grasp lamp, rotate 90 degrees, and remove.
WARNING: OBSERVE NORMAL SAFETY PRECAUTIONS WHEN HANDLING
FLUORESCENT LAMPS. BROKEN LAMPS MAY CAUSE INJURY.
I. Remove protective cover.
J. Install protective cover on new lamp.
K. Install protective cover on new lamp.
L. Rotate lamp cover to closed position and secure fasteners to hold lamp cover.
M. Test lamp.
(1)
Remove do-not-operate identifier and set switch on attendant’s panel to BRIGHT. Check that lamp comes on
(2)
Set switch to OFF.
N. Raise ceiling panel to installed position pressing upper edge in outboard direction to clear support edge.
NOTE: Excess lengths of lanyard should be stowed along edge of ceiling panel so as to not wedge between panel and center support.
O. Move panel inboard to push inboard edge into support and push up on outboard edge to lock both outboard latches.
P. Check that flaps along edges of ceiling panel are overlapping adjacent panels properly.
Q. Close overhead stowage compartment beneath ceiling panel.
(1) Raise ceiling panels and close storage compartment door (Ref 25-21-341, MP).
R. Remove electrical power if no longer required.
Nov 15/78 33-21-24 Page 203 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
CEILING LIGHT BALLAST - REMOVAL/INSTALLATION
EFFECTIVITY
Wide-Body Look and Carry-All Compartment Interior
1. General
A. Ballasts for the curved ceiling fluorescent lights are located on the same panel as the lights or attached to airframe structure above the ceiling panel, above a panel hinge or along the center line of the airplane. The ballasts for the forward lowered ceiling fluorescent lights, when installed, are located adjacent to the inboard side of the light assemblies.
2. Remove Ballast (Fig. 401)
A. Open CABIN CEILING LIGHT circuit breakers on P18 load control center (6 places). Attach do-not-operate identifier.
WARNING: HIGH VOLTAGE IS USED FOR CEILING LIGHT OPERATION. FAURE TO DISABLE CIRCUIT MAY CAUSE INJURY.
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