INDICATOR LIGHT – MAINTENANCE PRACTICES
1. General (Fig. 201)
A. The standard rectangular indicator light electrical components consist of two lamps, two diodes, a fuse, a press-to-test switch, and four screw type terminals. The indicator light assembly is readily relamped from the front of the panel but access to the rear of the panel is required for indicator light assembly replacement. The cap assembly and the base assembly are removed through the front of the panel. The mounting sleeve and the terminal plate assembly are removed from the backside of the panel.
B. Two types of standard indicator light assemblies are in service. One type is retained by two cross-recess (Phillips head) screws. The other type is retained by a single 5/64 hex-socket (Allen) screw.
2. Prepare for Maintenance (Fig. 201)
A. Remove dc power.
B. Gain access to rear of indicator.
(1) Fold down panel or pull out module as required.
3. Remove Indicator Light Assembly (Fig. 201)
A. Disconnect and tag electrical wires from indicator light terminals.
B. Grasp cap assembly and pull from light assembly.
C. Insert 5/64 hex key (Allen wrench or equivalent) and loosen indicator mounting screw.
NOTE: See Fig. 201, some indicator lights have two cross-recess (Phillips) head type mounting screws. For these assemblies loosen both screws.
D. Check sleeve to verify which end is adjacent to panel.
NOTE: Sleeve is reversible to adjust for panel thickness.
E. Remove terminal assembly and sleeve from rear of installation.
F. Pull body and contact assembly from front of panel.
4. Install Indicator Light Assembly (Fig. 201)
A. Insert body and contact assembly through front of panel.
B. Slide sleeve over body from rear of panel. Check that sleeve is correctly oriented.
C. Position terminal assembly and secure screw(s) in body and contact assembly.
D. Press cap assembly into place.
E. Connect wires to terminals on indicator base and remove tags.
5. Restore Airplane to Normal
A. Replace panel or module removed for access.
B. Close circuit breakers opened on step 2.A.
C. Test indicator light.
(1)
Provide electrical power.
(2)
Press the indicator light and check that it comes on.
(3)
Remove electrical power if no longer required.
501
Jun 20/83 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 33-11-81 Page 201
Indicator Light Installation 501
33-11-81 Figure 201 Jun 20/83
Page 202
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
INDICATOR LIGHT - MAINTENANCE PRACTICES
EFFECTIVITY
Airplanes with Korry 432 series
STAB OUT OF TRIM indicator light
1. General
A. The 432 series indicator light consists of two main components: a removable cap assembly that contains four lamps; and a base assembly that contains a logic module and switches for indicator press to test light function. The indicator light is relamped by withdrawing the cap assembly from the mounting base, replacing faulty lamps, and reinserting the cap assembly into the base.
2. Prepare for Relamping Indicator Light
A. Provide electrical power (Ref 24-22-00).
B. Momentarily operate master dim and test LIGHTS switch to TEST position and identify lamp(s) to be replaced.
C. Open DIM & TEST circuit breaker on P6-3 panel.
3. Relamp Indicator Light
A. Grasp cap assembly and pull directly out to retract cap assembly locking pins. Continue pulling cap assembly until it is free of base assembly.
NOTE: The cap assembly will remain captive to the base assembly by two retaining elements.
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