S 864-019
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 33-43-11
 ALL  ú ú 01 Page 407 ú Nov 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
 ANTICOLLISION LIGHTS - DESCRIPTION AND OPERATION
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General
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 A.  Red flashing anti-collision lights are mounted on the top and the bottom of the airplane fuselage aft of the wing leading edge. The ANTI COLLISION light switch on the P5 overhead panel provides control.
 B.  For more data about this lighting system, refer to these sources:
 (1)  SSM 33-40-02
 (2) WDM 33-44-01Upper Anticollision Light
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 A.  The light is mounted through a cutout in the top of the fuselage. The light installation consists of three basic components. These are the mounting plate that is permanently attached to the airplane structure, the lens, gasket, and retaining ring which are installed from the topside of the airplane, and the light assembly that is installed from the inside of the airplane.
 (1)  The light assembly consists of a xenon arc flashtube (lamp) encircling a parabolic reflector. The reflector directs the light beam horizonatally. The reflector and lamp are mounted to a transistorized unit containing a timing circuit and a power supply. The timing circuit controls the flash rate at approximately one flash per second. The light assembly is removed from the inside of the airplane for relamping or replacement by lowering a ceiling panel, loosening four retaining nuts, pulling the light assembly and disconnecting the electrical wiring.
 B.  The 115v ac transfer bus No. 1 supplies electrical power for light operation through the UPPER ANTICOLLISION circuit breaker on the P18-3 circuit breaker panel.
Lower Anticollision Light
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 A.  The lower light installation is similiar to the upper light. The light is mounted through a cutout in the bottom of the fuselage. A pan inside the fuselage provides a receiving area for the light assembly and fuel vapor isolation. The light assembly may be removed by loosening four retaining nuts, pulling light assembly and disconnecting electrical wiring.
 B.  The 115v ac transfer bus No. 2 supplies electrical power through the LOWER ANTICOLLISION circuit breaker on the P18-3 circuit breaker panel .
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 33-44-00
 ALL  ú ú 01 Page 1 ú Jul 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500
MAINTENANCE MANUAL

UPPER ANTICOLLISION LIGHT

LOWER ANTICOLLISION LIGHT
Anticollision Light - Component Location
Figure 1

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 33-44-00
 ALL  ú ú 01 Page 2 ú Jul 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 ANTICOLLISION LIGHTS - TROUBLE SHOOTING
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 1.  General
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 A.  Trouble shooting the anti-collision lights is best accomplished during adjustment/test (33-44-00). Trouble shooting requires that power be available and appropriate circuit breakers be closed.
 WARNING: DO NOT LOOK DIRECTLY AT STROBE ANTI-COLLISION LIGHT FROM CLOSE
_______ RANGE. LIGHT FLASHES MAY CAUSE MOMENTARY VISION IMPAIRMENT.
 B.  Trouble shooting procedures are based on the assumption that wiring is OK and electrical power is available. If the corrective action in the procedure does not correct the problem, check the wiring using the wiring diagram.
2. Anticollision Light Trouble Shooting Chart

TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
Light is inoper-ative  Light assembly defective or switch is defective  Replace light assembly. If still inoperative, replace switch  Replace Light Assembly. Replace switch 
　
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