(4)
Loosen hose clamp and slide flexible shroud off aft shroud "section B" to expose flexible fuel line coupling. Disconnect APU fuel lines.
(5)
Obtain access to APU fuel line aft shroud (View 4) in tail cone through stabilizer trim access door (Ref Chapter 12, Access Doors and Panels).
(6)
Loosen hose clamp attaching flexible shroud to aft shroud "section B" and slide flexible shroud forward to expose fuel line.
(7)
Withdraw aft portion of flexible fuel line from aft shroud "section B," lowering line through access door opening.
(8)
Remove "section A" segment of aft shroud.
(a)
Remove bolt securing bonding jumper to aft shroud.
(b)
Remove bolts (Detail C) attaching aft shroud to pressure bulkhead.
(c)
Remove bolts attaching aft shroud support clamps to pressure bulkhead (2 places).
(d)
Rotate aft shroud and remove through access door by sliding shroud off flexible fuel line.
(9)
Withdraw forward portion of flexible fuel line from the main shroud by pulling the line aft, at the pressure bulkhead, passing line through access door.
D. Install APU Fuel Feed Line (Flexible)
(1)
Insert flexible fuel line through stabilizer trim access door and insert into aft end of main shroud (Detail C, Fig. 401).
(2)
Continue to insert fue1 line into main shroud until line contacts center tank interconnect fitting (View 3).
(3)
Pull flexible shroud away from center tank interconnect fitting and connect fuel line.
NOTE: Do not attach flexible shroud until fuel line leak check has been performed.
(4)
Install "section A" segment of APU fuel line aft shroud (View 4, Detail C).
(a)
Slide sealing gasket and shroud over fuel line, through the stabilizer access door, and position against pressure bulkhead.
(b)
Install shroud support clamps (2 places). Loosely attach clamps to pressure bulkhead.
(c)
Align slip joint, sealing gasket, and shroud. Install mounting bolts and washers.
(d)
Tighten shroud support bolts and install bolt securing bonding jumper to aft shroud. Check electrical bond between aft shroud and airplane structure per 20-22-01, I/C. Resistance shall not exceed 0.010 ohm.
(5)
Insert aft end of flexible fuel line in aft shroud "section B" and slide fuel feed line aft until line contacts the APU fuel line (APU compartment) Connect fuel line (View 4, Detail B).
NOTE: Do not attach flexible shroud to aft shroud "section B" until fuel line leak check has been performed.
(6)
Slide flexible shroud over aft shroud "section B' and install hose clamp (view 4).
(7)
Pressurize APU fuel feed line and check for leaks (fuel method).
(a)
Connect external electrical power to airplane (Ref 24-22-0 MP).
(b)
Close fuel system circuit breakers on P6 panel: FWD BOOST PUMP TANK 2, SHUTOFF VALVE ENG 1, SHUTOFF VALVE ENG 2, APU CONT, and MANIF VALVE.
(c)
Close INDICATOR LTS circuit breaker on P6 panel.
(d)
Pull engine fire switches on P8 panel to FIRE position to close both engine fuel shutoff valves.
(e)
Place crossfeed valve switch on P5 panel in OPEN position.
(f)
Open the APU fuel valve.
1) Put the BATTERY switch to ON.
2) Put the APU master switch to ON.
(g)
Put the tank No. 2 FWD boost pump switch in ON position.
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Jun 20/84 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 28-22-81 Page 409
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28-22-81 Page 410 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Oct 20/84
1) To operate any of the fuel boost pumps, you must be in the flight compartment to continuously monitor the fuel quantity and the low pressure indication in the fuel tank.
WARNING: DO NOT OPERATE ANY FUEL BOOST PUMP IF THE LOW PRESSURE LIGHT COMES ON AND STAYS ON. FUEL VAPORS IN THE TANK MAY IGNITE AND CAUSE A FIRE OR EXPLOSION.
a) Immediately put the applicable fuel boost pump switch(es) to OFF if the LOW PRESSURE light comes on and stays on.
NOTE: When defueling or transferring fuel with minimum backpressure to the pumps, it is possible for the low pressure light(s) to be on. In this case, monitor the tank quantity and put the pump switch(es) to OFF if the tank quantity is not changing.
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