(3)
Loosen hose clamp and slide flexible shroud off aft shroud "section C" to expose flexible fuel line coupling. Disconnect APU fuel line.
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.
(4)
Remove "section C" segment of aft shroud.
(a)
Disconnect APU fuel feed line coupling (view 3) from the APU fuel filter installation.
(b)
Remove bolt securing bonding jumper (detail A) to aft shroud.
(c)
Remove bolts attaching aft shroud support clamp to APU compartment.
(d)
Remove bolts attaching aft shroud to APU shroud fuel adapter (view 3).
(e)
Rotate fuel feed line and aft shroud and remove from APU shroud.
(f)
Slide aft shroud and sealing gaskets off fuel feed line.
(5)
Remove "section B" segment of aft shroud.
(a)
Obtain access to aft shroud (view 2 ) in tail cone through stabilizer trim access door (Ref Chapter 12, Access Doors and Panels).
(b)
Loosen hose clamp attaching flexible shroud to aft shroud "section B" and slide flexible shroud forward to expose fuel line.
(c)
Withdraw aft portion of flexible fuel line from aft shroud, lowering line through access door opening.
(d)
Remove bolt securing bonding jumper to aft shroud.
(e)
Remove bolts securing aft shroud support clamps (two places).
(f)
Obtain access to aft shroud in APU compartment (detail A) and remove bolts securing aft shroud support clamp.
(g)
Remove aft shroud by pulling shroud through APU compartment.
(6)
Remove "section A" segment of aft shroud.
(a)
Remove bolt securing bonding jumper to aft shroud.
(b)
Remove bolts (detail B) attaching aft shroud to pressure bulkhead.
(c)
Remove bolts attaching aft shroud support clamps to pressure bulkhead (two places).
(d)
Rotate aft shroud and remove through access door while sliding shroud off flexible fuel line.
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28-22-91 Page 408 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Oct 20/84
C. Install APU Fuel Feed Line Shroud (Aft)
(1)
Install "section A" segment of aft shroud.
(a)
Slide sealing gasket and shroud (view 2, detail B) over fuel line, through the stabilizer access door, and position against pressure bulkhead.
(b)
Install shroud support clamps (two places). Loosely attach clamps to pressure bulkhead.
(c)
Align slip joint (detail B), sealing gasket, and shroud. Install mounting bolts and washers.
(d)
Tighten shroud support bolts and install bolt securing bonding jumper to aft shroud.
(e)
Check electrical bond between aft shroud and airplane structure per 20-22-01 I/C. Resistance shall not exceed 0.010 ohm.
(2)
Install "section B" segment of aft shroud.
(a)
Slide aft shroud through hole in APU compartment wall into tail cone (view 2) while feeding the flexible fuel line into the aft shroud.
(b)
Loosely secure aft shroud support clamps (three places).
(c)
Slide flexible shroud over aft shroud and install hose clamp.
Oct 20/84 28-22-91
Page 409
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(d)
Install bolt securing bonding jumper to aft shroud.
(e)
Check electrical bond between aft shroud and airplane structure per 20-22-01, I/C. Resistance shall not exceed 0.010 ohm.
(f)
Position aft shroud and tighten shroud support bolts.
(3) Install "section C" segment of aft shroud.
(a)
Slide sealing gaskets and aft shroud (view 3) on APU fuel line.
(b)
Rotate fuel feed line and shroud and insert fuel feed line into APU shroud adapter and install mounting bolts.
(c)
Align sealing gaskets and fuel feed line flange with APU shroud fuel adapter and install mounting bolts.
(d)
Install bolts attaching aft shroud support clamp (detail A) to APU compartment.
(e)
Install bolt attaching bonding jumper to aft shroud.
(f)
Check electrical bond between aft shroud and airplane structure per 20-22-01, I/C. Resistance shall not exceed 0.010j ohm.
(g)
Connect fuel feed line coupling (view 3) to APU fuel filter installation.
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