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 B.  A strobe light assembly is also mounted behind the acrylic lens. For more information on the wingtip strobe light refer to MM 33-44-00/001 (white anti-collision light reference of Anti-Collision Lights).
Tail Navigation Lights
______________________
 A.  Each light assembly contains a quartz halogen lamp mounted beneath a clear lens. The lights are relamped by loosening two screws and pulling its lens assembly.
Navigation Light Transformers
_____________________________
 A.  Three transformers are provided for navigation light operation. A transformer is located in each wingtip and in the aft E8 equipment rack P84 panel. The wingtip transformers have electrical connectors and are accessible through the lower side of the wing leading edge near the wing tip when leading edge flaps are extended.
Operation
_________
 A.  The 115-volt ac ground service bus supplies power to the transformers through the navigation lights relay. The relay and the circuit breakers are located on P6 panel. The NAV lights switch on the P5 panel turns the lights on by completing the ground path for the relay coil.
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 33-43-00
 ALL  ú ú 01 Page 1 ú Oct 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 TAIL NAVIGATION LIGHT - MAINTENANCE PRACTICES
_____________________________________________
 1.  General_______
 A.  This procedure contains three tasks. The first task is the replacement of the lamp in the tail navigation light.
 B.  The second task is the removal of the tail navigation light.
 C.  The third task is the installation of the tail navigation light.
 TASK 33-43-01-962-001
 2.  Lamp Replacement (Tail Navigation Light) (Fig. 201)________________________________________
 A.  Consumable Materials
 (1)  
B00062 Solvent - Acetone or equivalent grease free solvent

 (2)  
G01043 Cloth, lint free

 B. Parts ~.............................................................................. | AMM | | AIPC | ................. ...........................| | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ...............................................................................| | 201 | 1 | Light Assembly | 33-43-00 | 01 | 5 | | | 2 | Light Assy. Fasteners *[1] | | | | | | 3 | Lens Assembly | | | | | | 4 | Lens Assy. Fasteners | | | | | | 5 | Lamp | | | | | | 6 | Lamp Retainer | | | | | | 7 | Lamp Retainer Screws | | | | | | 8 | Lamp Holder Assy. | | | | | | 9 | Electrical Wires | | | | 2......…........…...................................…..........….......….......1 *[1] Items 2-9 To be furnished
 C.  References
 (1)  
24-22-00/201, Manual Control

 (2)  
SSM 33-43-10

 D.  Access
 (1)  Location Zone
 300 Empennage - Tail Cone

 E.  Procedure
 S 212-002
 WARNING:_______MAKE SURE THE APU IS OFF. THE APU EXHAUST CAN CAUSE INJURY TO PERSONS WHEN YOU DO MAINTENANCE AT THE TAIL CONE AREA.
 (1)  
Put the APU CONTROL switch on the P5 panel to the OFF position and attach a DO-NOT-OPERATE tag.

 S 862-003

 (2)
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  P83 Panel
 1) APU PRIMARY CONTROL

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 33-43-01
 ALL  ú ú 01 Page 201 ú Feb 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

1. LIGHT ASSEMBLY
2. LIGHT ASSEMBLY FASTENERS
TAIL
NAVIGATION
LIGHT

3. LENS SEE A ASSEMBLY
4. LENS ASSEMBLY SEE B
FASTENERS
9. ELECTRICAL WIRES
TAIL NAVIGATION LIGHT
A
TO REPLACE THE LAMP, LOOSEN THE SCREWS AND MOVE EACH LAMPHOLDER IN THE DIRECTION SHOWN
6. LAMP RETAINER
5. LAMP
7.
 LAMP RETAINER SCREWS

8. LAMP HOLDER ASSY

9.
 ELECTRICAL WIRES (2 LOCATIONS)

B
Tail Navigation Light Relamping/Installation
　
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