(j)
Close MANIF VALVE circuit breaker on P6 panel.
(2) Test Fuel Tank No. 1 Fuel Boost Pump Bypass Valve
(a)
Close all six fuel boost pump removal valves.
(b)
Place crossfeed valve switch, on forward overhead panel (P5), in OPEN position.
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(c)
Using lock assemblies, lock tank No. 1 and 2 boost pump bypass valves in close position.
(d)
Apply suction from fueling truck. Check that no fuel is being drawn from tanks.
NOTE: If fuel is drawn from tanks, source could be either or both boost pump bypass valves or one or more fuel boost pump removal or vent valves. Source should be located and corrected before continuing.
(e)
Unlock tank No. 1 boost pump bypass valve. Check that fuel is being drawn from tanks at a slow defueling rate.
(f)
Stop suction from fueling truck.
(g)
Open all fuel boost pump removal valves.
NOTE: If tank No. 2 boost pump bypass valve is to be tested do not open the three boost pump removal valves in tank No. 2.
(h)
Remove lock assemblies from boost pump bypass valve operating rods.
NOTE: If tank No. 2 boost pump bypass valve is to be tested do not remove lock assembly from tank No. 2 bypass valve.
(i)
Place crossfeed valve switch, on P5 panel in CLOSED position.
(j)
If test of fuel tank No. 2 fuel boost pump bypass valve is to be omitted, proceed to par. 3.E.(4).
(3)
Test Fuel Tank No. 2 Fuel Boost Pump Bypass Valve
(a)
Close all three fuel boost pump removal valves in Tank No. 2.
(b)
Verify that fuel crossfeed valve and engine No. 2 fuel shutoff valve are in CLOSED position.
(c)
Install lock assembly on tank No. 2 boost pump bypass valve operating rod and lock tank No. 2 bypass valve in close position.
(d)
Apply suction from fueling truck. Check that there is no fuel flow from tanks.
NOTE: If fuel flow occurs, source could be one or more fuel boost pump removal or vent valves (Ref 3.D.).
(e)
Unlock boost pump bypass valve. Check that fuel is being drawn from tanks at a slow defueling rate.
(f)
Stop suction from fueling truck.
(g)
Open all fuel boost pump removal valves.
(h)
Remove threaded rod of lock assembly from boost pump bypass valve, if still installed.
(4)
Restore Airplane to Normal Configuration
(a)
Install fuel boost pump bypass valve access plugs.
(b)
Disconnect suction hose from fueling receptacle and install cap.
(c)
Close manual defueling valve.
(d)
Install aft main and all center tank fuel boost pump access panels.
NOTE: Insure that boost pump removal valve is open before installing boost pump access panel.
(e)
Install small clearance panels below main tank FWD boost pump removal valve handles. Ensure that retaining chain is not pinched between panel and stringers before tightening screws.
(f)
Remove leading edge flap locks (Ref 27-81-0 MP).
WARNING: LEADING EDGE FLAPS ARE FAST ACTING AND CAN CAUSE SERIOUS INJURY TO PERSONNEL.
(g)
Open MANIF VALVE circuit breaker on P6 panel.
(h)
Push engine fire switches, on aisle stand P8 panel, to NORMAL position.
(i)
Remove external electrical power if no longer needed.
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F. Fuel Boost Pump Bypass Valve Test (using airplane engines)
(1) Test of the Fuel Boost Pump Bypass Valve
(a)
Verify that fuel crossfeed valve switch on forward overhead panel (P5) is in CLOSED position (Fig. 501).
NOTE: When you do this test, a direct tank to engine fuel feed must be used.
(b)
Start engine No. 1 (AMM Chapter 71, Power Plant).
(c)
With engine running at idle, place LH center tank and tank No. 1 boost pump switches on P5 panel in OFF position.
(d)
Check that fuel flow to engine is uninterrupted.
NOTE: If fuel flow decreases and a possible engine flameout is indicated, shut down the engine by placing start lever in cutoff position.
(e)
Advance thrust lever to 93% N2 position (90% takeoff thrust) and monitor fuel flow and engine operation.
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