BEACON LIGHTS – ADJUSTMENT/TEST
1. Test Beacon Lights
A. Provide electrical power.
B. Close ANTICOLLISION – UPPER and LOWER circuit breakers on P18 panel.
C. Advise all personnel working in area close to strobe beacon light to avoid looking at strobe light when it is flashing.
WARNING: DO NOT LOOK DIRECTLY AT FLASHING STROBE LIGHT FROM CLOSE RANGE. LIGHT FLASHES MAY CAUSE MOMENTARY VISION IMPAIRMENT.
D. Set ANTICOLLISION light switch on P5 overhead panel to ON, and check that both beacon lights come on and flash.
E. Set switch to OFF.
F. Remove electrical power if no longer required.
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UPPER BEACON LIGHT - MAINTENANCE PRACTICES
1. General (Fig. 201)
A. The upper beacon (anticollision) light assembly is mounted on a flange assembly which is riveted to the fuselage surface at station 570. The entire light assembly (except the lens) must be removed. Repair of the assembly is then accomplished in the shop as an overhaul function.
2. Remove Light (Fig. 201)
A. Open ANTICOLLISION LIGHT-UPPER circuit breaker on P18 circuit breaker panel.
B. Lower or remove right ceiling panel approximately 60 inches forward of overwing escape hatch center (Ref 25-21-341, MP).
C. Push inboard on convoluted section of airduct to provide access to beacon light.
D. Disconnect two beacon light wires from terminal strip.
E. Loosen four nuts retaining assembly; rotate assembly counterclockwise and remove light assembly.
3. Install Light
A. Clean inside of lens with clean, dry cloth.
B. Place light assembly in position and rote assembly clockwise to engage mounting screws.
C. Tighten retaining nuts.
D. Connect wiring to terminal strip.
E. Close circuit breaker opened in step 2.A.
F. Raise and latch or install (if removed) ceiling panel (Ref 25-21-341, MP).
G. Test Light
(1)
Provide electrical power.
(2)
Set anticollision light switch on pilots' forward overhead panel (P5) to ON. Check that beacon light flashes.
WARNING: DO NOT LOOK DIRECTLY AT LIGHT FROM CLOSE RANGE. LIGHT FLASHES MAY CAUSE TEMPORARY VISION IMPAIRMENT.
(3)
Return switch to OFF.
(4)
Remove electrical power if no longer required.
Aug 15/80 33-44-13 Page 201 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Upper Beacon Light Installation 503
33-44-13 Figure 201 Aug 15/80
Page 202
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
UPPER BEACON LIGHT LENS - REMOVAL/INSTALLATION
1. General
A. The upper beacon light is located on top of the fuselage at station 568.5. The lens is removed from the outside of the airplane.
2. Equipment and Materials
A. Acetone - grease free solvent, or equivalent
B. Cloth - nonabrasive, lint free
3. Remove Lens (Airplanes with P/N 40-0173 Light Assy) (Fig. 401, Sheet 1)
A. Open applicable circuit breaker for Upper Beacon Light on P18 panel and attach DO-NOT-CLOSE tag.
B. Remove two retaining screws, washers, fillers and non-metallic washers.
C. Remove lens and gasket.
D. Clean lens with acetone and lint free cloth.
E. Visually inspect lens for cracks and discoloration, replace as required.
4. Install Lens (Airplanes with P/N 40-0173 Light Assy) (Fig. 401, Sheet 1)
A. Install lens and gasket.
B. Install two retaining screws, washers, fillers and non-metallic washers.
C. Close previously opened circuit breaker and remove DO-NOT-CLOSE tag.
5. Remove Lens (Airplanes with P/N 40-0196 Light Assy) (Fig. 401, Sheet 2)
A. Open applicable circuit breaker for Upper Beacon Light on P18 panel and attach DO-NOT-CLOSE tag.
B. Remove four retaining screws.
C. Remove lens retaining ring, lens and gasket.
D. Clean lens with acetone and lint free cloth.
E. Visually inspect lens for cracks and discoloration, replace as required.
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