(2)
Bonding meter (Ref 20-22-01 I/C)
B. Prepare for APU Fuel Feed Line (No. 1 Fuel Tank) Removal
(1)
Connect external electrical power to airplane (Ref Chapter 24, Electrical Power).
(2)
Check that all fuel system circuit breakers, on aft overhead panel (P6), are closed.
(3)
Defuel fuel tank No. 1 (Ref 28-23-0 MP).
(4)
Place crossfeed valve switch, on forward overhead panel (P5), in the CLOSED position.
(5)
Ensure that ignition circuit breakers on P6 panel are open and that engine No. 1 start lever on aisle stand is in IDLE position.
(6)
Check that engine No. 1 fuel shutoff valve is open. Fire switch, on aft electronic panel (P8), in and locked.
(7)
Remove external electrical power from airplane.
(8)
Remove LH center tank fuel boost pump access panel (7201L) and close fuel boost pump removal valve.
(9)
Open engine No. 1 cowl panel to gain access to engine fuel filter (Ref Chapter 71, Power Plant).
(10)
Drain engine fuel supply line by opening the fuel filter drain port. Provide 5-gallon container for drained fuel. Close drain port after draining.
(11)
Remove fuel tank No. 1 access panel No. 1, to provide access to APU fuel feed line (Ref 28-11-0, 28-11-11 R/I).
(12)
Purge fuel tank No. 1 (Ref 28-10-0 MP).
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Oct 20/84 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 28-22-81 Page 401
C. Remove APU Fuel Feed Line (No. 1 Fuel Tank)
(1)
Disconnect one end of APU fuel line bonding jumper (View 1, Fig. 401).
(2)
Remove bolt attaching APU fuel line support clamp.
(3)
Remove bolts attaching APU fuel line bypass to bracket.
(4)
Disconnect APU fuel line coupling nut at engine fuel feed line and tee connection. Remove line.
WARNING: DO NOT CONNECT ELECTRICAL POWER TO AIRPLANE WHEN FUEL FEED LINES ARE DISCONNECTED. REFER TO 28-10-0, MAINTENANCE PRACTIVES, FOR SAFETY PRECAUTIONS.
(5)
Disconnect APU fuel line coupling nut at APU fuel valve
(6)
Place suitable container under connections and disconnect APU fuel line coupling nut at APU fuel valve and APU fuel feed fitting at the 70.85 rib web. Remove line.
D. Install APU Fuel Feed Line (No. 1 Fuel Tank)
(1)
Insert the three APU fuel line segments through access panel opening No. 1 and applicable rib access openings.
(2)
Connect APU fuel line coupling nut to the APU fuel valve and APU fuel feed fitting at the
70.85 rib web.
(3)
Connect APU fuel line, tee, and bypass pickup assembly coupling nut to the APU fuel valve.
(4)
Connect APU fuel line coupling nut to the engine fuel feed line and tee connection.
(5)
Position APU bypass on bracket and install mounting bolts.
(6)
Position support clamps and install attaching bolts.
(7)
Connect APU fuel line bonding jumpers.
(7)
Check electrical bond between APU fuel line and airplane structure per 20-22-01 I/C. Resistance shall not exceed 0.010 ohm.
(8)
Pressurize APU fuel feed line and check for leaks (air method).
(a)
Temporarily detach suction port fuel line from connecting fitting and attach air pressure source and gage to fitting.
(b)
If open, manually close APU fuel shutoff valve.
(c)
Apply 40-psi maximum air pressure and hold for a minimum of 5 minutes.
(d)
Check all fuel line connections and fittings for evidence of external leakage (no leakage allowed).
(e)
Release pressure, remove air source and pressure gage, and reconnect suction port fuel line. Check tube nuts for tightness.
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28-22-81 Page 402 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Oct 20/84
5A6 APU Fuel Feed Line Installation
Sep 20/82 Figure 401 (Sheet 1) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 28-22-81 Page 403
APU Fuel Feed Line Installation 539
28-22-81 Page 404 Figure 401 (Sheet 2) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Aug 15/73
500 APU Fuel Feed Line Installation
Feb 15/68 Figure 401 (Sheet 3) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 28-22-81 Page 405
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