(6)
Monitor the fuel quantities in the center tank an the No. 1 tank for fuel transfer from the center tank to the No. 1 tank for a minimum of two hours.
(a)
If the pressure relief valve (if installed) has leakage, it can cause a fuel transfer of approximately 20 pounds (10 kilograms) per hour.
(b)
If the bypass check valve has leakage, it can cause a transfer of approximately 2500 pounds (1140 kilograms) per hour.
(c)
If there is no fuel transfer, and leakage was found in the APU fuel system between the fuel tank and the APU shutoff valve, then there is problem with the main APU fuel check valve.
(7)
Set the L CTR FUEL PUMPS switch to OFF.
(8)
Remove the DO-NOT-CLOSE tag and close this circuit breaker:
(a) E3-3 Electrical Shelf, APU Control Unit
(9)
Set the APU master switch, on the P5 forward overhead panel, back to the OFF position.
501
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ENGINE FUEL FEED SYSTEM - ADJUSTMENT/TEST
1. General
A. The engine fuel feed system test provides a leak test for the fuel feed system, and a functional test of the fuel boost pumps and all fuel control valves. A test of the fuel system portion of the master caution light system is included in the fuel boost pump functional test.
2. Equipment and Materials
A. Leading Edge Flap Actuator Locks - F80048-89 (Preferred), F80048-90 (Preferred), F80048-84 (Alternate), and F80048-36 (Alternate)
B. Fuel Boost Pump Bypass Valve Lock Assembly - P/N ME65-16713
3. Engine Fuel Feed System Test
A. Engine Fuel Shutoff Valve Test
(1)
Prepare for engine fuel shutoff valve test.
(a)
Connect external electrical power to airplane (Ref Chapter 24).
(b)
Extend flaps and install leading edge flap locks (Ref 27-81-0 MP).
WARNING: REFER TO 27-81-0 MP FOR LOCK INSTALLATION PROCEDURE. FLAPS ARE FAST ACTING AND CAN CAUSE SERIOUS INJURY TO PERSONNEL.
(c)
Close SHUTOFF VALVE ENG 1 and SHUTOFF VALVE ENG 2 circuit breakers on aft overhead panel (P6).
(d)
Close INDICATOR LTS MASTER DIMMING control cabin lighting circuit breakers on P6 panel.
(e)
Ensure engine ignition circuit breakers on P6 panel are open and engine start levers on aisle stand are in CUTOFF.
(f)
Position BAT switch, on forward overhead panel (P5), to ON.
(2)
Test engine fuel shutoff valve.
(a) Press to test engine shutoff valve position indicator lights located on pilots' forward overhead panel (P5) and ensure lights illuminate bright (blue) (Fig. 501).
527
May 01/00 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 28-22-0 Page 501
F94900 F95115 F95120 F95124
Engine Fuel Feed System Component Location 5C8
28-22-0 Figure 1 (Sheet 1) Aug 01/96
Page 502
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
5C8 Engine Fuel Feed System Installation
Oct 20/85 Figure 501 (Sheet 2) 28-22-0
Page 502A
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Engine Fuel Feed System Installation 5C8
28-22-0 Figure 501 (Sheet 3) Oct 20/85
Page 502B
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
5E2 Engine Fuel Feed System Installation
Oct 20/85 Figure 501 (Sheet 4) 28-22-0
Page 503
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(b)
Visually check position indicator on both engine fuel shutoff valves and verify that valves are fully closed.
(c)
Advance engine No. 1 start lever 1.80 inch from CUTOFF position. Check that respective valve position indicating light illuminates bright while valve is in transit and extinguishes after reaching full open. Verify full opening of valve by observing position indicator on valve. Also, visually check engine No. 2 fuel shutoff valve and fuel crossfeed valve to ensure no actuation.
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