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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
White dome light Burned out bulb or Observe other lights on the Relamp dome light.
inoperative faulty switch circuit are operative. If OK, dome light is faulty. If other lights on circuit off, switch is probably faulty Replace switch
Flight kit light or Burned out bulb, Relamp light and press switch. Relamp light.
reading light faulty switch or Observe light is maximum Replace light
inoperative potentiometer on light assembly brightness. If light fails to illuminate, assembly is faulty assembly
Lights will not dim Shorted variable transformer Rotate variable transformer control back and forth and check for variation in light intensity. If lights do not dim, variable transformer is faulty Replace variable transformer
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Nov 15/78 33-11-0
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
DME digital display lights inoperative Faulty DME indicator or potentiometer Replace DME indicator. Observe lights. If OK, indicator was faulty. If lights still inoperative, potentiometer is probably faulty Replace DME indicator. Replace potentiometer
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OXYGEN REGULATOR LIGHTS - MAINTENANCE PRACTICES
1. General
A. An oxygen regulator is provided for each flight crewmember. The regulator lights consist of lightplates and indicator lights. A common power source is used for all lights on each regulator. The lightplates are not relampable on the airplane and should be replaced if illumination is not satisfactory. The indicator lights, when installed, are readily relampable as detailed in the following steps. (See figure 201.)
2. Relamp Oxygen Regulator Indicator Light
A. Set PANEL light control knobs on captain' s and first officer's panels to OFF.
B. Open PANEL & INSTRUMENT 28-VOLT PRIMARY circuit breakers on load control center P6.
C. Unscrew light assembly cap on front of regulator panel. (See figure 201.)
D. Remove lamp from light assembly housing noting position of glass portion of lamp.
E. Insert lamp into light assembly housing glass bulb end first.
CAUTION: DO NOT ATTEMPT TO INSERT LAMP INTO HOUSING WITH ELECTRICAL POWER APPLIED TO THE REGULATOR AS THE HOUSING INSULATION MAY BE DAMAGED BY ARCING.
F. Install light assembly cap.
G. Close circuit breakers opened in 2.B.
501
Feb 15/73 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 33-11-21 Page 201
Oxygen Regulator ReLamping 501
33-11-21 Figure 201 Nov 15/72
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
LIGHTPLATES - REMOVAL/INSTALLATION
1. General
A. Lightplates give lighting to the components and words on the pilots' panels.
B. When the lighting becomes too dim, you must replace the lightplate. Before you use a lightplate again, you must send it to the shop for lamp replacement. Do not try to replace the lamps in a lightplate while you are in the airplane. Instructions for lamp replacement are in the vendor's manual.
2. Prepare to Remove the Lightplate
A. Supply electrical power (Ref 24-22-00).
B. Set each switch for the lightplates to the bright position.
(1) Identify each lightplate that does not come on or comes on dimly.
C. Set each switch to the off position.
3. Remove the Lightplate
A. If it is necessary, remove the control knobs that are in front of the lightplate.
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