(2)  
Full Body Harness

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

 (3)  
Resistance measuring bridge or ohmmeter capable of measuring .001 ohm

 (4)  
Sealing Gun

 (5)  
Spatula

 (6)  
Stainless Steel Brush

 C. Consumable Materials
 (1)  
A00247 Sealant - BMS 5-95, Class B-1/2

 (2)  
B00184 Solvent - BMS 11-7

 (3)  
G00009 Corrosion Inhibiting Compound - BMS 3-23

 D. 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
 E. Procedure
 S 862-064
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 862-061

 (2)  
On the pilot's control stand panel, P8, set the STAB TRIM 2 switch and the STAB TRIM 3 switch to the CUTOUT position.

 S 862-063

 (3)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
Overhead Circuit Breaker Panel, P7
 1) 7E07, STAB TRIM S/O LEFT
 2) 7E20, STAB TRIM S/O RIGHT

 (b)  
Aft Center Miscellaneous Circuit Breaker Panel, P84 1) LOGO LIGHTS - LEFT

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747-400 MAINTENANCE MANUAL
 2)  LOGO LIGHTS - RIGHT
 (4)  S 942-065Put on the body harness and attach it to the attach point on the horizontal stabilizer with the attach lanyard.
 (5)  S 022-066Do these steps to remove a logo light assembly: (a) Remove the screws that hold the logo light assembly to the airplane skin. (b) Lift out the logo light assembly. (c) Disconnect the electrical wires from the bottom of the housing. (d) Remove the logo light assembly.
 (6)  S 212-067Do a visual check of the faying surfaces on the logo light assembly and the airplane for corrosion and dirt.
 S 142-068

 CAUTION:_______MAKE SURE THAT THE FAYING SURFACES ARE CLEAN. IF THEY ARE NOT CLEAN, AN UNSATISFACTORY GROUND CAN OCCUR AND CAUSE THE SYSTEM TO OPERATE INCORRECTLY.
 (7)  Clean the faying surfaces with a stainless steel brush until the faying surfaces are free from corrosion and dirt.
 NOTE: The use of materials other than stainless steel can
____ increase the risk of subsequent corrosion.
 S 112-069
 (8)  
With a cloth, apply large quantities of the solvent, BMS 11-7, to the faying surfaces; then rub clean.

 S 622-070

 (9)  
Apply the compound, BMS 3-23, to the faying surfaces to prevent corrosion.

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747-400 MAINTENANCE MANUAL
 S 212-076
 (10)
 Make sure that the holes in each end of the quench tube are clear. Clean, if necessary.

 S 422-071

 (11)
 Do these steps to install a logo light assembly:

 (a)  
Connect the electrical wires to the bottom of the housing.

 INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.

 (b)  
Apply a layer of a sealing compound to the electrical wires on the terminals (AMM 20-11-29/201).

 (c)  
Put the new assembly in the airplane skin.

 (d)  
With BMS 5-95, wet install the screws that hold the housing in position.

 (e)  
Make sure that the resistance from the screws in the housing to the airplane skin is not more than .001 ohm.

 WARNING:_______ MAKE SURE THAT YOU USE THE COMPOUND TO SEAL EACH BARE
 ELECTRICAL CONNECTION NEAR THE LIGHT.  THIS WILL PREVENT
 AN EXPLOSION OF THE FUEL FUMES.  AN EXPLOSION CAN CAUSE
　
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