(b)  
Make sure that the flexible joints are not preloaded. 1) Do a hand spin check to make sure.

 (c)  
Tighten the V-band clamps and retainers.

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 ALL  ú ú 01 Page 424 ú Oct 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 TASK 36-11-01-364-130
 13. Wing Leading Edge Flap Drive Duct Clamp - Installation (Fig. 405)______________________________________________________
 A. General
 (1)  
This procedure contains a task to install a low profile ductclamp on the pneumatic flap drive duct for engine 1 and 4 at the wing leading edge to prevent interference/chafing condition with the fuel line. The low profile duct clamp does not use a T-bolt to lock the clamp.

 B.
Consumable Material

 (1)  
D00049, Lubricant - Silicone Fluid, Viscasil 10,000

 (2)  
D00050, Lubricant - Silicone Fluid, DC 200 - 10,000

 C.
References

 (1)  
AMM 06-09-08/201, Wing Access Doors and Panels

 (2)  
AMM 20-11-28/401, Standard Practices - Lockwire

 (3)  
AMM 27-81-00/201, Leading Edge Flap System

 (4)  
AMM 36-00-00/201, Pneumatic System

 (5)  
AMM 54-53-00/201, Strut Drains and Sealant

 D.
Access

 (1)  
Location Zone
 520 Left Wing Leading Edge to Front Spar
 620 Right Wing Leading Edge to Front Spar

 (2)  
Access Panel 521FT Access Panel - Upper, Left Outboard Nacelle Gap Cover 621FT Access Panel - Upper, Right Outboard Nacelle Gap Cover

 E.
Prepare to Install the Low Profile Clamp

 S 864-131
 WARNING: MAKE SURE THAT THE LEADING EDGE FLAP SAFETY LOCKS ARE INSTALLED
_______ BEFORE YOU DO WORK ADJACENT TO THE LEADING EDGE FLAPS. OPERATION OF THE LEADING EDGE FLAPS CAN CAUSE INJURY AND DAMAGE.
 MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP CONTROL LEVER. WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP CONTROL LEVER.
 (1) Extend and lock the wing leading edge flaps (AMM 27-81-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 S 864-132
 (2)
Release the pressure in the pneumatic system (AMM 36-00-00/201).

 S 014-133

 (3)  
Remove applicable upper outboard nacelle gap cover (521FT, 621FT) to get access to the work area in the engine strut number 1 or 4 (AMM 06-09-08/201).

 S 014-134

 (4)  
Get access to the duct retainer clamp which connects the wing leading edge flap drive duct to the pneumatic duct.

 S 214-135

 (5)  
Check to see if the low profile clamp is installed at the pneumatic flap drive duct.

 (a)  
If the low profile clamp assembly is not installed, then it is necessary to get a low profile clamp assembly, which consist of a sleeve and a retainer assembly complete this procedure.

 F. Install the Low Profile Clamp
 S 014-136
 (1)  
Remove and discard the high profile clamp with a T-bolt, if it is installed.

 S 214-140

 (2)  
Make sure that the centerline of the flap drive duct is axial alignment to the duct boss on the pneumatic duct.

 S 964-149

 (3)  
Replace the seals.

 (a)  
Remove the two used seals.

 (b)  
Lubricate the seal retainer grooves only with a clean, soft, lint-free cloth.

 NOTE: Do not lubricate the seal or the seal surfaces.
____
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