APU FUEL FEED LINE SHROUD -REMOVAL/INSTALLATION
1. General
A. The APU fuel feed line shroud runs from the fuel feed line exit point on the center wing box upper skin to the APU shroud fuel adapter. To simplify removal/installation, the APU fuel feed line shroud is divided into two segments. The segment from the center wing box upper skin to the forward side of the pressure bulkhead will be identified as the main shroud. The segment from the aft side of the pressure bulkhead to the APU shroud fuel adapter will be identified as the aft shroud.
2. Removal/Installation APU Fuel Feed Line Shroud (Main)
A. Equipment and Material
(1)
Air Pressure Source - 10 psi maximum
(2)
Bonding meter (Ref 20-22-01 I/C)
B. Prepare for APU Fuel Feed Line Shroud (Main) Removal
(1)
Remove aisle carpets and floor panels, between station 616 and station 1016, for access to main shroud interconnect fittings and shroud clamps (Ref Chapter 25, Equipment/Furnishings).
NOTE: Access to the five shroud clamps, between station 947 and station 1016, may be obtained through the aft wall access panels of the aft cargo compartment.
(2)
Remove electrical power from airplane.
C. Remove APU Fuel Feed Line Shroud (Main)
(1) Remove main shroud portion of flexible fuel feed line.
NOTE: If the flexible fuel feed line is to be completely removed, refer to 28-22-81, Remove APU Fuel Feed Line (Flexible).
(a)
Remove bolts attaching flexible shroud to center tank interconnect fitting (Fig. 401).
(b)
Pull flexible shroud away from the center tank interconnect fitting and disconnect flexible feed line coupling nut.
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28-22-91 Page 401
WARNING: DO NOT CONNECT ELECTRICAL POWER TO AIRPLANE WHEN FUEL LINES ARE DISCONNECTED. REFER TO 28-10-0, FUEL STORAGE SYSTEM - MAINTENANCE PRACTICES, FOR SAFETY PRECAUTIONS.
NOTE: When the flexible fuel line is opened, a small amount of fuel will drain from the center cavity/APU shroud drain mast. A suitable container should be placed under the drain mast.
(c)
Obtain access to APU fuel line aft shroud (view 2) in tail cone through stabilizer trim access door. Refer to Access Doors and Panels, Chapter 12.
(d)
Remove bolt securing bonding jumper to aft shroud "section A".
(e)
Remove bolts (detail B) attaching "section A" shroud to pressure bulkhead.
(f)
Remove bolts attaching aft shroud support clamps to pressure bulkhead (two places) and pull "section A" shroud away from pressure bulkhead.
(g)
Withdraw forward portion of flexible fuel line from the main shroud by pulling the line aft, coiling flexible line in tail cone area.
(2)
Remove bolts attaching flexible shroud (view 1) to main shroud.
(3)
Remove shroud support clamps (21 places). (See detail C.)
(4)
Remove main shroud from floor beams by pulling shroud forward, rotating shroud to clear control cables and lifting shroud sufficiently to clear floor panels.
(5)
Remove shroud from airplane through aft door.
500
28-22-91 Page 402 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 15/68
500 APU Fuel Feed Line Shroud Installation
Feb 15/68 Figure 401 (Sheet 1) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 28-22-91 Page 403
APU Fuel Feed Line Shroud Installation 500
28-22-91 Page 404 Figure 401 (Sheet 2) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 15/68
500 APU Fuel Feed Line Shroud Installation
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