(2)  
Insert small rod (or similar device in each inboard corner and push to release latches (use care not to mar PSU surface), and lower PSU until lanyard is taut.

(3)  
Note position of adjustment plate on index marks.

(4)  
Rotate thumb nut in reading light till adjustment plate is free to rotate.

(5)  
Reposition adjustment plate to correct for misalignment of light. Each index mark represents approximately 2 inches of movement at the seat level.

(6)  
Secure thumb nut tight. Ensure that light is secured in position.

(7)  
Raise PSU and secure latches.

(8)  
Apply power and test light beam as in step (1).

(9)  
Repeat steps (2) thru (9) if required.

Feb 15/78 33-21-13 Page 201
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

Passenger Reading Lights Installation  518 
33-21-13  Figure 201  Feb 15/78 
Page 202 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

2.  Relamp Passenger Reading Lights
A.  Insert small rod ( or similar device) in each inboard corner and push to release latches, (use care not to mar PSU surface), release hook in lanyard and extend PSU to fully lowered position.
B.  Grasp light housing and pull. The housing will come off the lamp exposing the bulb.
C.  Relamp
D.  Index small tab on lamp holder into slot in housing and press housing back onto light assembly.
E.  Raise PSU and secure latches.
3.  Test Reading Light Lamps
A.  Provide electrical power.
B.  check that applicable reading light circuit breakers on P18 panel are closed.
C.  Press each of the reading light switches on PSU and check that reading lights come on.
D.  Press switches and check that reading lights go off.
E.  Remove electrical power if no longer required.
518 
Feb 15/78  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  33-21-13 Page 203 

CEILING LIGHTS - MAINTENANCE PRACTICES
EFFECTIVITY
Wide-Body Look Interior
1. General
A.  Fluorescent ceiling lights are mounted in the ceiling panels above the stowage bins. A typical ceiling light installation contains two fluorescent light assemblies, a ballast for the fluorescent lights and an incandescent lamp used for night illumination and/or standby light purposes. The ceiling panels are hinged on their lower outboard corners and swing down for easy maintenance. No special tools are required.
2.  Relamp Fluorescent Ceiling Lights
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 (260 VOLTS AC) 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.
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 (Fig. 201).
NOTE:  On some locations ceiling-mounted exit signs may interfere with the lowering of the ceiling panel. If this problem exists, remove exit sign assembly (Ref 33-50-91, R/I).
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.  Release four captive screws on light assembly cover and rotate cover down and outboard.
Nov 15/78 33-21-23 Page 201
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

Ceiling Lights ReLamping  527 
33-21-23  Figure 201  Feb 15/72 
Page 202 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

J.  Grasp lamp, rotate 90 degrees, and remove.
WARNING:  OBSERVE NORMAL SAFETY PRECAUTIONS WHEN HANDLING
FLUORESCENT LAMPS. BROKEN LAMPS MAY CAUSE INJURY.

K.  Remove protective cover.
L.  Install protective cover on new lamp.
M.  Insert replacement lamp rotate 90 degrees (until seated).
N.  Rotate lamp cover to closed position and secure fasteners.
O.  Test lamp.
(1)  
Remove do-not-operate identifier and set switch on attendant's panel to BRIGHT. Check that lamp comes on.
　
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