(2)
Close LAV DOME LIGHT circuit breaker on P18 panel. Check that dome light comes on.
(3)
Remove electrical power if no longer required.
501
Aug 01/74 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 33-21-41 Page 203
PASSENGER INFORMATION SIGNS - MAINTENANCE PRACTICES
EFFECTIVITY
ALL EXCEPT ATI INTERIOR
1. General
A. Steps for relamping the no smoking, fasten seat belt and return to seat signs is provided in the following. The no smoking and fasten seat belts legends form a single sign module that is mounted in each PSU and on some vertical partitions. The return to seat signs are mounted in each lavatory. The no smoking and fasten seat belt sign switches on the pilots' overhead panel provide control.
2. Relamp No Smoking/Fasten Seat Belt Signs on PSU's (Fig. 201)
A. Prepare for Relamping
(1)
Verify that no smoking and fasten seat belt switches on pilot's overhead panel are set to OFF. Attach do-not-operate identifier.
(2)
Lower PSU and gain access to rear of sign module. Check sign module configuration.
B. Relamp signs WITHOUT sliding catch (Fig. 201).
(1)
Loosen two captive screws, if installed, on rear of sign module and press on rear of sign module until free of retaining spring clips.
CAUTION: THE LENS AND LAMP ASSEMBLY IS HELD IN PLACE BY TWO SCREWS ON SOME INSTALLATIONS, AND BY SPRING CLIPS ON OTHER INSTALLATIONS. ALWAYS DETERMINE IF SCREWS ARE INSTALLED AND REMOVE BEFORE ATTEMPTING TO REMOVE THE LENS AND LAMP ASSEMBLY TO PREVENT DAMAGING THE ASSEMBLY.
(2)
Pull sign outboard and upward until lens and lamp housing assembly is removed.
(3)
Replace lamps.
(4)
Insert lens and lamp housing assembly and firmly press into place.
CAUTION: DO NOT INSTALL LENS AND LAMP HOUSING ASSEMBLY WITH ANY LAMP(S) MISSING. A MISSING LAMP MAY ALLOW SPRING CONTACT TO TOUCH LAMP SOCKET PROVIDING SHORT CIRCUIT TO GROUND.
(5)
Tighten two captive fasteners, when installed, on rear of sign module.
Oct 20/84 33-21-51 Page 201
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Passenger Sign Relamping 571
33-21-51 Figure 201 May 15/78
Page 202
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
3. Relamp Signs on Vertical Partitions
A. General
(1) Signs mounted on vertical partitions are accessible from the front side only. The signs can be removed and installed from the front side without special tools. Two types of signs are used. One is flush-mounted and is similar in appearance to the signs on the PSU's. The other type is framed by a bezel assembly. The lens assemblies for both types are held in place by spring clips and are pulled outward for relamping. (See figure 201.)
B. Verify that no-smoking and fasten-seat-belt sign switches on pilots' overhead panel are set to off and attach do-not-operate identifier.
C. Pull lens assembly from partition. (See figure 202.)
CAUTION: AVOID DAMAGING PARTITION SURFACE OR SIGN FINISH.
D. Replace lamps or lamp assemblies as applicable. (See figure 202.)
E. Install lens assembly. Press lens assembly into position.
F. Test lamps.
(1)
Provide electrical power.
(2)
Remove do-not-operate identifiers and set no smoking and fasten seat belt switches on pilots' overhead panel to on. Check that both the no smoking and fasten seat belt legends on relamped sign are illuminated.
(3)
Set switches to off.
(4)
Remove electrical power if no longer required.
501
Feb 15/73 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 33-21-51 Page 203
Typical Vertical Partition Sign Installations 501
33-21-51 Figure 202 Feb 15/73
Page 204
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
4. Relamp Return-to-Seat Sign
A. Verify that the fasten seat belt switch on the pilots' overhead panel is set to off and attach a do-not-operate identifier.
B. Pull out call panel assembly. (Fig. 202)
NOTE: Call panel assembly is attached by spring catches. A thin piece of plastic may be useful in prying call panel assembly loose.
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