J. Remove ballast mounting screws and remove ballast.
Feb 15/79 33-21-31 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Ceiling Light Ballast Installation 577
33-21-31 Figure 401 Nov 15/78
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
3. Install Ballast
A. Install ballast and secure mounting screws.
NOTE: Bonding jumper and washers, if installed, should be installed on replacement ballast.
B. Attach wires to ballast terminals. Remove identifiers if used.
C. Replace protective shields on wire terminals.
D. Close circuit breakers on P18 panel opened in step 2A. Remove do-not-operate identifiers.
E. Test Ballasts
(1)
Provide electrical power.
(2)
Set CEILING light switch on forward attendant's to DIM. Check that ceiling light(s) for replaced ballast come on in the dim mode.
(3)
Set switch to BRIGHT. Check that light(s) for replaced ballast come on in the bright mode.
(4)
Set switch to OFF.
(5)
Remove electrical power if no longer required.
F. Close ceiling panel and check that latches are secure (Ref 25-21-341, MP).
G. Close stowage bin and check that latch is secure.
506
Feb 15/79 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 33-21-31 Page 403
LAVATORY LIGHTS - MAINTENANCE PRACTICES
EFFECTIVITY
ALL EXCEPT ATI INTERIOR
1. General (Fig. 201)
A. The lavatory mirror lights are mounted vertically along side of the mirror. The power to turn the lamp on is controlled by the lavatory door bolt operated switch. When external power is connected to the airplane and all buses are energized, the lavatory mirror lights receive 450-volt ac power with the door bolt switch in either the door open or door closed condition.
B. Two types of fluorescent mirror lights are used.
(1)
One type has a spring metal band fastened to upper and lower edges of acrylic lens. This type of lens is rotated to expose lamps by pressing in on both spring bands and pulling applicable edge of lens out of engagement with light assembly housing. The lower end cap need not be removed. Lens is attached to light assembly by a cable.
(2)
The other type is rotated to expose lamps by removing lower end cap and then pressing applicable edge out of engagement with light assembly housing.
2. Relamp Fluorescent Light (Fig. 201)
A. Open LAVATORY MIRROR LIGHTS circuit breaker on P18 panel and LAVATORY MIRROR LIGHTS circuit breaker on P6 panel.
B. Gain access to lamps.
(1)
On light assemblies with spring bands on lens, press side of spring band until band and edge of lens are free of light assembly housing. Rotate lens.
(2)
On all other light assemblies, remove lower end cap. Press on sides of lens and rotate until free.
C. Replace fluorescent lamps.
D. Replace lens and check that it is firmly seated in light assembly housing.
E. Install end cap if removed.
F. Close circuit breakers opened in step A.
G. Test lamps.
(1) Provide electrical power.
Oct 20/84 33-21-41 Page 201
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Lavatory Fluorescent Lights 501
33-21-41 Figure 201 Aug 01/74
Page 202
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(2)
Check that lamp comes on.
(3)
Remove electrical power if no longer required.
3. Relamp Lavatory Dome Light
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