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 C.  Each power supply assembly contains a transistorized power circuit and timing circuit. The unit develops the high voltage (approximately 500 volts) and timing sequence (approximately 48 cycles per minute) for flashtube operation. Each power supply has two electrical connectors. One connector goes to airplane wiring and the other to the strobe light cable.
 5.  Tail Cone Anti-Collision Light
______________________________
 A.  A strobe (xenon flashtube) anti-collision light is installed on the tail cone below the APU exhaust port. A cable assembly connects the light to its power supply. The power supply is mounted in the lower portion of the tail cone just aft of the APU access doors. The strobe light, cable, and power supply are the same as the units mounted in the wingtips. The strobe light is relamped by removing four mounting screws, disconnecting electrical connector, and removing light. The power supply is replaced by opening the APU access doors, disconnecting the electrical connectors, and removing four mounting screws.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 UPPER ANTI-COLLISION LIGHT - MAINTENANCE PRACTICES
__________________________________________________
 1.  General
_______
 A.  This procedure contains a task for the replacement of the lamp in the upper anti-collision light.
 TASK 33-44-01-962-001
 2.  Lamp Replacement (Fig. 201)
________________
 A.  Consumable Materials
 (1)  G01043 Cloth - Clean Dry
 B.  References
 (1)  
24-22-00/201, Manual Control

 (2)  
33-44-01/401, Upper Anti-Collision Light

 (3)  
25-22-03/401, Upper Deck Ceiling Panels

 (4)  
IPC 33-44-01

 (5)  
SSM 33-44-01

 C.  Access
 (1)  Location Zone 200 Forward Upper Deck Ceiling, Passenger Cabin
 D.  Procedure
 S 962-020
 (1)  Replace the lamp in the anti-collision light:
 (a)  Find the ceiling panel at station 568 (the fifth ceiling panel forward of the midrange lowered ceiling).
 NOTE: Some airplanes have a panel installed in the
____ ceiling panel to get access to the light.
 (b)  
On airplanes with an access panel, open the access panel in the ceiling panel.

 (c)  
On airplanes without an access panel, remove the ceiling panel (Ref 25-22-03/401).

 (d)  
Loosen three sides of the insulation to get access to the light assembly.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

AIRPLANE
LENS
SKIN
ASSEMBLY
(REF)
LIGHT HOUSING SUBASSEMBLY
SEE A
LIGHT HOUSING ASSEMBLY
ELECTRICAL CONNECTOR
GROUND WIRE LUG
GROUND LIGHTWIRE HOUSING
ASSEMBLY
UPPER ANTI-COLLISION LIGHT
LENS
ASSEMBLY

PREFORMED
PACKING
SCREW
LOCK REFLECTOR
WASHER
RETAINER
LAMP LIGHT HOUSING SUBASSEMBLY
A
Upper Anti-Collision Light Lamp Replacement Figure 201
H47021
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (e) Open this circuit breaker and attach a DO-NOT-CLOSE tag:
 1)  P6 main power distribution panel
 a) 6L31 RED ANTI-COLLISION LTS

 WARNING: DO NOT TOUCH THE LIGHT ASSEMBLY FOR 10 MINUTES AFTER YOU
_______ REMOVE POWER. AN ELECTRICAL SHOCK FROM THE HIGH VOLTAGE IN THE LIGHT CAN CAUSE INJURY TO PERSONS.
　
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