S 034-127
(10)
Remove the seal sleeve from the duct.
TASK 36-11-01-364-061
9. Duct Section with a Flexible Joint Installation (Fig. 402)
_______________________________________________
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
(4)
AMM 71-11-06/201, Core Cowl Panels
(5)
AMM 78-31-00/201, Thrust Reverser System
B. Install the Duct Section
S 214-070
(1)
Make sure there are no defects with the flexible clamp seal sleeve and seal retaining grooves which could damage the replacement seals.
S 214-071
(2)
Do the steps that follow before you install a new duct section:
(a)
Make sure that the new duct section is not damaged and do not have unwanted objects on it.
(b)
Make sure that the adjacent duct sections are not damaged and do not have unwanted objects on it.
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S 164-072
(3) Carefully clean the surfaces of the seal sleeve and seal retaining grooves with a clean, dry, lint-free cloth, or compressed air.
NOTE:____Do not use solvents. Do not scrape the internal surfaces of the sleeve against the external surface of the duct or ferrule when you clean the sleeve. The internal sleeve surface is permanently lubricated.
S 644-106
(4)
Lubricate the seal retainer grooves only with a clean, soft, lint-free cloth.
S 424-107
(5)
Install the seal.
S 424-160
(6)
Install sleeve over one of the ferrule-duct assemblies.
S 434-078
(7)
Position the duct section in place and support it loosely with support hardwares (rods, clamps, etc.) which have not been tightened.
(a)
Push both ferrule assemblies together so that the distance between the ferrule ends does not exceed dimension "A" shown in Fig. 402.
(b)
Slide and center the sleeve over the ferrule assemblies.
NOTE: Excessive preload should not be required to align
____ duct ferrules into place since the ducts are loosely fitted at this point.
1) Use your finger tips to set the seal under the sleeve. 2) If the seal comes out of the sleeve, push it down into the groove and under the sleeve.
S 434-079
CAUTION: MAKE SURE THAT THE DUCT JOINT CLAMP DOES NOT PRELOAD DUCT
_______ FLANGES WHICH COULD CAUSE FATIGUE CRACKS OF FLANGE WELDS.
(8)
Install the retainer assembly over the assembled ferrule-sleeve sub-assembly.
(a)
Properly position the retainer assembly to support hardware, if applicable.
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747-400 MAINTENANCE MANUAL
(b) Install the T-bolt with washers and self-locking nut, tighten to 14-18 pound-inches.
NOTE: Make sure that control cables, wiring, etc. in the area
____ around the retainer is not caught under the retainer.
S 434-161
(9) Tighten the ducting/joint support rods and clamps.
C. Make sure that the coupling and ducts are not preloaded.
S 214-112
(1)
Do a "Hand Spin Check": rotate the retainer assembly about the axis of the duct by hand pressure.
(a)
If the retainer assembly cannot be rotated a full turn by hand pressure only, disassemble the joint and assemble per the above "Install the Duct Section" instructions.
(b)
If the retainer assembly can rotated a full turn by hand pressure only, the retainer installation is acceptable.
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