S 214-074
 (2)  
Make sure that there is at least one inch clearance around the retainer assembly.

 (a)  
Adjust the ducting/joint supports to gain additional clearance, if necessary.

 S 864-075
 (3)  
Pressurize the pneumatic manifold (AMM 36-00-00/201).

 S 214-076

 (4)
Examine all joints affected by the repair for excessive leakage.

 (a)  
Diffused leakage is permitted.

 (b)  
Concentration leakage must be repaired.

 NOTE: Concentration leakage is leakage which you can feel
____ with your hand at a distance of 12 inches.
 S 424-108
 (5)  Install and secure duct insulation, if necessary.
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747-400 MAINTENANCE MANUAL
 TASK 36-11-01-364-104
 10. Wing Leading Edge T-Duct Removal (Fig. 403)________________________________
 A. References
 (1)  
AMM 06-09-08/201, Wing Access Doors and Panels

 (2)  
AMM 27-81-00/201, Leading Edge Flap System

 (3)  
AMM 36-00-00/201, Pneumatic System

 B.
Access

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

 (2)  
Access Panel 511CT Access Panel - Upper, Left Wing Inboard Nacelle 611CT Access Panel - Upper, Right Wing Inboard Nacelle

 C.
Prepare to Remove the Duct Section

 S 864-081
 (1)  
Release the pneumatic pressure from the pneumatic system (AMM 36-00-00/201).

 S 014-082

 (2)  
Remove the applicable wing upper surface access panel (511CT, 611CT) (AMM 06-09-08/201).

 D.
Remove the Duct Section

 (1)  S 034-085Remove the rigid joint clamp on the inboard side of the T-duct.
 (2)  S 034-087Support the duct section to be removed.
 (3)  S 034-083Remove the anti-rotation device springs from the flexible clamp on the outboard side of the T-duct.
 (4)  S 034-084Remove the flexible clamp from the outboard side of the T-duct.
 (5)  S 034-086Remove the flexible joint clamp between the T-duct and the strut duct.
 (6)  S 024-088Remove the T-duct section.
 (7)  S 394-089Put a cover on each open duct section to keep out unwanted material.

 TASK 36-11-01-404-110
 11. Wing Leading Edge T-Duct Installation (Fig. 403)
_____________________________________
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747-400
MAINTENANCE MANUAL

WING LEADING EDGE FRONT SPAR

Wing Leading Edge T-Duct Installation
Figure 403 (Sheet 1)

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B52939
A
747-400
MAINTENANCE MANUAL

WING LEADING  INCHES (EXAMPLE)
3.25
EDGE T-DUCT

____LEFT SYSTEM SHOWN;
NOTE: RIGHT SYSTEM SIMILAR.
Wing Leading Edge T-Duct Installation Figure 403 (Sheet 2)
B52884
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