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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 LOGO LIGHTS - DESCRIPTION AND OPERATION
_______________________________________
 1.  General_______
 A.  Two logo lights installed on the upper surface of each horizontal stabilizer illuminate the airline insignia on the vertical fin. The installation is weather sealed and aerodynamically flush.
 B.  Each pair of logo light assemblies have a transformer mounted inside the horizontal stabilizer slightly inboard from the logo lights. Access to the transformer is through an access panel on the lower side of the horizontal stabilizer near the trailing edge.
 C.  For more data about this lighting system, refer to these sources:
 (1)
SSM 33-45-01 thru 33-45-99

 (2)
WDM 33-45-11 thru 33-45-99

 2.  Operation_________
 A.  All four logo lights are controlled by a single switch on P5 pilots overhead panel. With the LOGO LIGHTS switch in the ON position, power is applied through a logo light control relay to left and right logo light transformers.
 B.  Each transformer applies power to an inboard logo light and an outboard logo light.
 C.  Electrical power for the logo lights is provided by two circuit breakers on the ground service bus: LOGO LIGHT - LEFT, and LOGO LIGHT - RIGHT. Circuit breakers are located on the P84 panel at the E8 aft equipment center.
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 33-45-00
 ALL  ú ú 01 Page 1 ú Feb 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 LOGO LIGHTS - MAINTENANCE PRACTICES
____________________________________
 1.  General_______
 A. This procedure contains these tasks:
 (1)  
Logo Light - Lamp Replacement

 (2)  
Logo Light - Assembly Replacement

 (3)  
Logo Light - Transformer Replacement

 (4)  
Logo Lights - Operational Test

 (5)  
Logo Light - Light Beam Adjustment

 TASK 33-45-00-962-001
 2.  Logo Light - Lamp Replacement (Fig. 201)_____________________________
 A. Equipment
 (1)  
24MIT65B00002 - Attach Lanyard - Saftety Harness Wing/Horizontal Stabilizer

 (2)  
Full Body Harness

 D.B. Industries
 3965 Pepin Avenue
 Redwing, MN 55066-1837
 Phone: (612) 388-8282

 (3)  
Sealing Gun

 (4)  
Spatula

 B. References
 (1)  
AMM 20-11-29/201, Seals on Open Electrical Terminals in Fuel Vapor Areas

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 51-31-01/201, Seals and Sealing

 C. Access
 (1)  Location Zone 222 Control Cabin, Right 334 Horizontal Stabilizer Rear Spar To Trailing Edge, Left 344 Horizontal Stabilizer Rear Spar To Trailing Edge, Right
 D. Procedure
 S 862-084
 (1)  Supply electrical power (AMM 24-22-00/201).
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 33-45-00
 ALL  ú ú 01 Page 201 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

LENS
RETAINER MOUNTING SCREWLOGO LIGHTS
(6 LOCATIONS)
SEE A
FASTENERS (4 LOCATIONS) GASKET
LENS ASSEMBLY
LOGO LIGHTS SEE A LENS
LANYARD SCREWLANYARD
LAMP
MOUNTING SCREWS
ELECTRICAL
(2 LOCATIONS)
WIRES
HINGE
LAMP RETAINER (OPEN ADJUSTMENT
POSITION)
SCREWS (2 LOCATIONS)
HOUSING LOGO LIGHT (REF) TERMINAL (2 LOCATIONS)
HOUSING
ELECTRICAL WIRE QUENCH TUBE (2 LOCATIONS)
GROUNDING STUD SEE B(2 LOCATIONS)
LOGO LIGHT BA
Logo Light Lamp Replacement
Figure 201

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