6.  Install Lens (Airplanes with P/N 40-0196 Light Assy) (Fig. 401, Sheet 2)
A.  Install gasket, lens and retaining ring.
B.  Secure with four retaining screws.
C.  Close previously opened circuit breaker and remove DO-NOT-CLOSE tag.
7.  Remove Lens (Airplanes with P/N 30-0837 Light Assy) (Fig. 401, Sheet 3)
A.  Open applicable circuit breaker for Upper Beacon Light on P18 panel and attach DO-NOT-CLOSE tag.
B.  Remove four retaining nuts.
C.  Remove lens retaining ring, lens and two gaskets.
D.  Clean lens with acetone and lint free cloth.
E.  Visually inspect lens for cracks and discoloration, replace as required.
8.  Install Lens (Airplanes with P/N 30-0837 Light Assy) (Fig. 401, Sheet 3)
A.  Install gasket, lens and retaining ring.
B.  Secure with four retaining screws.
C.  Close previously opened circuit breaker and remove DO-NOT-CLOSE tag.
500 
33-44-14 Page 402  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Feb 01/96 

F53799
500 Upper Beacon Light Lens Assembly (Airplanes with P/N 40-0173-XX Light Assembly) Feb 01/96 Figure 401 (Sheet 1) 33-44-14 Page 403 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

F53803
Upper Beacon Light Lens Assembly (Airplanes with P/N 40-0196-XX Light Assembly) 500 33-44-14 Figure 401 (Sheet 2) Feb 01/96 Page 404
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

F53827
500 Upper Beacon Light Lens Assembly (Airplanes with P/N 30-0837-XX Light Assembly) Feb 01/96 Figure 401 (Sheet 3) 33-44-14 Page 405 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

LOWER BEACON LIGHT - MAINTENANCE PRACTICES
1. General
A.  The lower beacon (anticollision) light is installed on a mounting plate on the underside of the fuselage. The entire light assembly must be removed. Only the lens can be replaced as a separate part. Repair of the assembly is accomplished in the shop as an overhaul function.
B.  The lower beacon light base (surface lens assembly mounting ring is attached to) should be faired to the airplane by aerodynamic smoother (Refer to 51-31-0, Maintenance Practices for smoother application). The surface of the aerodynamic smoother should be convex between light assembly and fuselage.
2.  Equipment and Materials
A.  Equipment
(1)  
Sealing gun - 6-inch length cartridge, Senco Research, or equivalent

(2)  
Sealant cutting tool - hardwood or plexiglass

(3)  
Varnish brush - 1- or 2-inch

(4) 
 Spatula

B.  Materials
(1)  
Aerodynamic smoother and weather sealant - BMS 5-79, or equivalent

(2)  
Accelerator - as indicated on sealant container

(3)  
Aliphatic Naphtha - TT-N-95, or equivalent

(4)  
Compound, (SWPM) 20-30-00

3.  References
A.  Standard Wiring Practices Manual (SWPM), 20-30-00
B.  MM 51-31-0 MP Seals and Sealing
4.  Remove Light (Fig. 201)
A.  Open ANTICOLLISION LIGHT-LOWER circuit breaker on P18 circuit breaker panel.
B.  Use cutting tool and remove aerodynamic smoother from beacon light base.
C.  Remove four mounting screws and lower light assembly to gain access to wiring.
D.  Disconnect two beacon light wires from terminal strip and remove light assembly.
5.  Install Light
A.  Using cutting tool, remove sealant from light assembly mounting on fuselage.
B.  Remove grease, oil, dirt and chips from mounting surface. Use small varnish brush to apply fresh aliphatic naphtha for cleaning. Wipe cleaner off with clean cloth.
C.  Support light assembly and connect wires to terminal strip.
504 
Feb 01/95  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  33-44-24 Page 201 

Lower Beacon Light Installation  503 
33-44-24  Figure 201  May 15/79 
Page 202 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

D. Seal the electrical terminals for a fuel vapor area (SWPM 20-30-00).
WARNING:  MAKE SURE YOU SEAL EACH BARE ELECTRICAL CONNECTION TO PREVENT AN EXPLOSION OF THE FUEL FUMES. AN EXPLOSION CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
E. Position light assembly and install mounting screws.
F. Using sealing gun, apply sealant around light assembly base until a convex ring is formed.
NOTE:  Make certain no air is trapped in recess during filling. Overfil1 recess to allow for smoothing and forming.
　
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