(i)
Put the boost pump switch in OFF position.
(j)
Put the APU master switch to OFF.
(k)
Put the BATTERY SWITCH to OFF.
(8)
Slide flexible shroud over aft shroud "section B" (Detail B) and install hose clamp.
(9)
Install the bolts that attach the flexible shroud (view 3) to center
(10)
Pressurize the APU fuel line shroud with air and check for leaks.
(a)
Disconnect the shroud drain line at interconnect fitting (view 3).
(b)
Apply 10 psi to shroud drain connection at interconnect fitting for 5 minutes. There shall be no loss of pressure.
(c)
Connect the shroud drain interconnect fitting.
E. Return Airplane to Normal Configuration
(1)
Push the engine fire switches on P8 panel to NORMAL position.
(2)
Put the crossfeed valve switch on P5 panel in closed position.
(3)
Install the floor panel and aisle carpets at STA 660 (AMM Chapter 25,
Equipment/Furnishings).
(4)
Open all fuel system and indicator light circuit breakers on P6 panel.
(5)
Remove external electrical power, if no longer required.
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5. Removal/Installation APU Fuel Feed Line (APU Compartment)
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 (APU Compartment)
(1)
Remove external electrical power from airplane.
(2)
Open APU CONT circuit breaker on P6 panel.
(3)
Obtain access to APU fuel feed line aft shroud in APU compartment through APU compartment access door (Ref Chapter 49).
(4)
Loosen hose clamp and slide flexible shroud off aft shroud "section C" to expose fuel line (Detail B, Fig. 401).
(5)
Tape flexible APU fuel line to shroud "section B" and disconnect fuel line coupling.
WARNING: DO NOT CONNECT ELECTRICAL POWER TO AIRPLANE WHEN FUEL LINES ARE OPEN (REF 28-10-0 MP).
(6)
Disconnect APU fuel feed line coupling from the APU fuel filter installation (view 5).
(7)
Remove bolt securing bonding jumper (Detail B) to aft shroud "section C."
(8)
Remove bolts attaching aft shroud "section C" support clamp to APU compartment.
(9)
Remove bolts attaching aft shroud to APU shroud fuel adapter (view 5).
(10)
Rotate fuel feed line, with aft shroud "section C" attached, and remove fuel feed line and shroud.
(a) Slide aft shroud and sealing gaskets off fuel feed line.
C. Install APU Fuel Feed Line (APU Compartment)
(1)
Slide sealing gaskets and aft shroud "section C" on APU fuel line.
(2)
Rotate fuel feed line and shroud and insert fuel feed line in APU shroud fuel adapter.
(3)
Align sealing gaskets and fuel feed line flange with APU shroud fuel adapter and install mounting bolts.
(4)
Install bolts attaching aft shroud support clamp (Detail B) to APU compartment.
(5)
Install bolt attaching bonding jumper to aft shroud.
(6)
Check electrical bond between aft shroud and airplane structure per 20-22-01 I/C. Resistance shall not exceed 0.010 ohm.
(7)
Connect fuel feed line coupling (View 5) to APU fuel filter installation.
(8)
Connect fuel feed line coupling (Detail B) to flexible fuel feed line. Remove tape used to secure flexible fuel feed line.
NOTE: Do not attach flexible shroud until fuel line leak check has been performed.
(9)
Pressurize APU fuel feed line and check for leaks (fuel method) per step 4.D.(7).
(10)
Slide flexible shroud over aft shroud "section C" and install hose clamp.
(11)
Pressurize APU fuel line shroud with air and check for leaks.
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(a) Perform step 4.D.(10) to leak check shroud.
D. Return Airplane to Normal Configuration
(1)
Push engine fire switches on P8 panel to NORMAL position.
(2)
Place crossfeed valve switch on P5 panel in closed position.
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