(2)
Set ANTICOLLISION light switch on pilots' forward overhead panel to ON.

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.

502 
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STROBE LIGHTS - DESCRIPTION AND OPERATION
1. General (Fig. 1)
A.  One strobe light is installed within the window housing on each wingtip and one strobe light is installed on the fuselage tail cone. The wingtip strobe lights illuminate an area forward and outboard of the airplane. The tail strobe light illuminates an area aft of the airplane.
B.  The lights are white and flash at approximately 60 flashes per minute. A three-position toggle switch labeled STROBE & STEADY-OFF-STEADY on overhead panel P5 completes 115 volts ac from bus No. 1 to the lights. A circuit breaker labeled STROBE is on load control center P18 (Fig. 2). Positioning the switch to STROBE & STEADY turns on the strobe lights and the navigation lights (Ref 33-43-0). The strobe lights are off when the switch is in any other position.
2.  Tail Strobe Light
A.  The tail strobe light fits into a tube on the fuselage tail cone. Eight screws retain the strobe light assembly in the tube. A single electrical connector is on the back of the assembly. The high intensity xenon lamp is a straight tube mounted in lockwired electrical receptacles. Six screws retain the lens thereby enabling easy access for relamping. A power supply consisting of a transistorized timing circuit and power conversion circuit is an integral part of the assembly.
3.  Wingtip Strobe Lights
A.  The wingtip strobe light is installed on a casting within the window housing on the wingtip assembly. Four bolts retain the strobe light assembly. An electrical connector is on the back of the assembly. The high intensity xenon lamps are straight tubes mounted in lockwired electrical receptacles. Four screws retain a cover which is removed when relamping the assembly. A power supply consisting of a transistorized timing circuit and power conversion circuit is an integral part of the assembly.
540 
Feb 1/74  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  33-45-0 Page 1 

 Strobe Lights Location  540 
33-45-0  Figure 1 (Sheet 1)  Feb 15/74 
Page 2 
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540  Strobe Lights Location 
May 01/01  Figure 1 (Sheet 2)  33-45-0 
Page 3 
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Strobe Light Schematic  540 
33-45-0  Figure 2  Feb 01/74 
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

STROBE LIGHTS - TROUBLE SHOOTING
1. Strobe Light Trouble Shooting Chart
TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
One wingtip strobe light inoperative; others OK Tail strobe light inoperative; others OK All strobe lights inoperative  Burned-out lamp Faulty strobe light assembly Burned-out lamp Faulty strobe light assembly Light switch or defective wiring  Place POSITION light switch to STROBE & STEADY and observe which light is inoperative Place POSITION light switch to STROBE & STEADY and observe which light is inoperative Place POSITION light switch to STROBE & STEADY and observe light is inoperative Place POSITION light switch to STROBE & STEADY and observe light is inoperative Check for 115 volts ac at switch terminals and continuity through switch (Ref Wiring Diagram Manual)  Replace lamp (Ref 33-45-11, Maintenance Practices) Replace strobe light assembly (Ref 33-45-11, Maintenance Practices) Replace lamp (Ref 33-45-21, Maintenance Practices) Replace strobe light assembly (Ref 33-45-21, Removal/Installation) Replace switch of defective wiring) 

540 
Feb 01/75  33-45-0 
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WINGTIP STROBE LIGHTS - MAINTENANCE PRACTICES
1.  General
A.  The following procedures provide instructions for replacing the strobe light assembly and relamping either the right or left wingtip strobe lights.
WARNING:  HIGH VOLTAGE IS PRESENT AT LAMP TERMINALS. WAIT 5 MINUTES AFTER SYSTEM IS OFF BEFORE REMOVING STROBE LIGHT.
　
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