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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A
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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