(2)  
Remove do-not-operate identifier and set fasten seat belt switch on pilots' overhead panel to on. Check that relamped sign illuminates.

(3)  
Set switch to off.

(4)  
Remove electrical power if no longer required.

527  Lavatory Call Panel Installation 
Feb 15/73  Figure 203  33-21-51 
Page 205 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

PASSENGER INFORMATION SIGNS - ADJUSTMENT/TEST
EFFECTIVITY
ALL EXCEPT ATI Interior
1.  General
A.  This procedure provides steps necessary to system test the passenger information signs electrical circuitry with the airplane on the ground.
NOTE:  The low tone chime should sound over the PA system each time the signs come on and go off (Ref 23-31-0, Passenger Address System).
B.  Landing gear downlock pins should be installed during portions of test requiring movement of landing gear control lever. In addition, trailing edge flap extension and retraction is required.
2.  Prepare for Test
A.  Provide electrical power.
B.  Check that no-smoking sign and fasten-seat-belt sign switches on pilots' overhead panel are set to OFF.
C.  Check that passenger sign circuit breakers on P18-3 are closed.
D.  Check that trailing edge flaps are in up position.
E.  Check that all landing gear ground locks are installed.
F.  Move landing gear control handle to OFF position.
3.  Test Passenger Information Signs
A.  Check that no-smoking, fasten-seat-belt and return-to-seat signs are off.
5C8
Jun 20/85 33-21-51 Page 501
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

B.  Set no-smoking sign and fasten-seat-belt sign switches on pilots' overhead panel to AUTO. Check that signs remain off.
C.  Extend trailing edge flaps. Check that fasten-seat-belt signs and return-to-seat signs come on.
D.  Retract trailing edge flaps. Check that signs go off.
E.  Move landing gear control lever to DOWN position. Check that no-smoking, fasten-seat-belt and return-to-seat signs come on.
F.  Move landing gear control handle to OFF position. Check that signs go off.
G.  Set no-smoking and fasten-seat-belt sign switches to OFF and move landing gear control lever to DOWN position.
H.  Set no-smoking sign switch to ON. Check that no-smoking signs come on.
I.  Set switch to OFF. Check that signs go off.
J.  Set fasten-seat-belt sign switch to ON. Check that fasten-seat-belt and return-to-seat signs come on.
K.  Set switch to OFF. Check that signs go off.
4.  Restore Airplane to Normal
A.  Restore flaps to original setting if required.
B.  Check that landing gear switch is in DOWN position. Remove 1anding gear ground locks if no longer required.
C.  Remove electrical power if no longer required.
500 
33-21-51 Page 502  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Aug 15/73 

WINDOW LIGHTS - MAINTENANCE PRACTICES
EFFECTIVITY
Wide-Body Look and Carry-All Compartment Interior
1.  General
A.  Window lights are installed in sidewall panels above each window. The window light assemblies are retained by two quick-release fasteners in the light molding and can be easily removed for relamping or replacement.
2.  Relamp Window Light
A.  Provide electrical power.
B.  Set WINDOW light switch on attendant's panel to ON. Identify lamp(s) to be replaced.
C.  Set switch to OFF. Attach a do-not-operate identifier.
WARNING:  HIGH VOLTAGE (200V AC) IS USED FOR WINDOW LIGHT OPERATION. FAILURE TO DISABLE CIRCUIT MAY CAUSE INJURY.
D.  Loosen two captive fasteners and pull window light assembly from sidewall panel (Fig. 201).
E.  Press center of lamp housing (side opposite hinges) and swing lens assembly on hinges until lamp is exposed (Fig. 201).
F.  Relamp.
WARNING:  OBSERVE NORMAL SAFETY PRECAUTIONS WHEN HANDLING FLUORESCENT LAMPS. BROKEN LAMPS MAY CAUSE INJURY.
G.  Close lens assembly. Check that catch is engaged.
H.  Position light assembly in sidewall panel and secure two captive screws.
I.  Test lamp.
(1)  
Remove do-not-operate identifier and set WINDOW light switch to ON. Check that light comes on.

(2)  
Set switch to OFF.
　
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