D.  Install APU Fuel Feed Line Shroud (Main)
(1)  
Insert main shroud through the aft door and place in position by feeding shroud aft through the floor beams, rotating the forward portion of shroud to clear control cables.

(2)  
Install new O-ring on main shroud aft end fitting and insert main shroud into pressure bulkhead slip joint (Fig. 401, Detail B).

(3)  
Attach flexible shroud (view 1) to main shroud. Torque attaching bolts to 180 pound-inches.

(4)  
Rotate main shroud until flexible shroud is aligned with the upper center tanks interconnect fitting. Center main shroud locating rings at clamp location (first shroud clamp aft of flexible shroud) and install clamp.

(5)  
Install remaining shroud support clamps (20 places) (detail C).

(6)  
Insert flexible fuel line through pressure bulkhead and feed line forward until upper center tank interconnect fitting is contacted. Connect flexible fuel line coupling nut.

NOTE: Do not attach flexible shroud until fuel leak check has been performed.

(7)  
Install "section A" segment of APU fuel line aft shroud (view 2, detail B).

(a)  
Slide sealing gasket and shroud into position against pressure bulkhead.

(b)  
Install shroud support clamps (two 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.

(e)  
Check electrical bond between aft shroud and airplane structure per 20-22-01 I/C. Resistance shall not exceed 0.010 ohm.

(8)  
Pressurize the APU fuel feed line and check for leaks.

(a)  
Connect electrical power to airplane.

(b)  
Open the APU fuel valve. 1) Check that APU CONT circuit breaker on panel P6 is closed. 2) Put the BATTERY SWITCH to ON. 3) Put the APU master switch to ON.

(c)  
Put the tank No. 1 FWD boost pump switch in ON position.

500 
28-22-91 Page 406  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 - Unpublished Work - See title page for details.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.
(d)  
After fuel low pressure indicating light goes off, put the boost pump switch in OFF position.

(e)  
Put the APU master switch to OFF.

(f)  
Put the BATTERY SWITCH to OFF.

(g)  
Check APU fuel line connection for leaks.

(9)  
Install the bolts that attach the flexible shroud (view 1) to center tank interconnect fitting.

(10)
Pressurize the APU fuel line shroud and do a check for leaks.

(a)  
Disconnect the shroud drain line located behind the "A" hydraulic reservoir on the wheel well forward wall.

(b)  
Apply 10 psi to shroud drain for five minutes. There shall be no loss of pressure.

(c) Connect the shroud drain. E Return Airplane to Normal Configuration
(1)  
Install the floor panels and aisle carpets (AMM Chapter 25, Equipment Furnishings).

(2)  
Determine if there is any further need for electrical power on airplane; if not, remove electrical power.

500 
May 01/03  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  28-22-91 Page 407 

Removal/Installation APU Fuel Feed Line Shroud (Aft)
A.  Equipment and Materials
(1)  
Air Pressure Source - 10 psi maximum

(2)  
Bonding meter (Ref 20-22-01 I/C)

B.  Remove APU Fuel Feed Line Shroud (Aft)
(1)  
Remove electrical power from airplane.

(2)  
Obtain access to APU fuel line aft shroud in APU compartment (Fig. 401 Detail A), through APU compartment access door (Ref Chapter 49, APU).
　
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