(d)  
Slowly advance start lever from final position reached in step (c) until IDLE position is attained. Check that valve remains open, with no tendency to close, throughout travel.

NOTE:  Valve should be closed whenever engine start lever is in CUTOFF position. Valve should open when start lever is 0.25 to 1.80 inch from lever CUTOFF detent position and should remain open up to and including IDLE detent position (Ref 28-22-112 A/T).

(e)  
Pull engine No. 1 fire switch, on aisle stand P8 panel, to FIRE position. Check that the respective valve position indicating light is illuminated bright (valve-in-transit) and then dims to indicate valve fully closed. Verify valve closed position by observing indicator on valve.

(f)  
Push in engine No. 1 fire switch to NORMAL position. Check that valve indicating light is illuminated bright (valve-in-transit) and then extinguishes to indicate valve fully open. Verify valve open position by observing indicator on valve.

(g)  
Return engine start lever to CUTOFF position. Check that valve position indicating light is illuminated bright (valve-in-transit) and then dims to indicate valve fully closed. Verify valve closed position by observing indicator on valve.

(h)  
Repeat steps (c) thru (g) for engine No. 2 fuel shutoff valve.

(i)  
Position BAT switch on P5 panel to OFF. Check that valve position indicating lights extinguish.

(3)  Restore airplane to normal.
(a)  
Open lighting and shutoff valve circuit breakers on P6 panel, if no longer needed.

(b)  
Remove leading edge flap locks (Ref 27-81-0 MP).

WARNING:  LEADING EDGE FLAPS ARE FAST ACTING AND CAN CAUSE SERIOUS INJURY TO PERSONNEL.

(c)  
Remove electrical power if no longer needed.

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B.  Fuel Crossfeed Valve Test
(1)  
Prepare for fuel crossfeed 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 MANIF VALVE (crossfeed valve) circuit breaker on P6 panel.

(d)  
Close INDICATOR LTS MASTER DIMMING control cabin lighting circuit breakers on P6 panel.

(2)  
Test fuel crossfeed valve.

(a)  
Press to test crossfeed valve position indicating light on pilots' forward overhead panel (P5) (Fig. 501). Check that light illuminates bright (blue).

(b)  
Verify that crossfeed valve switch on P5 panel is in the closed position. Visually check position indicator on valve and verify that valve is fully closed.

(c)  
Place crossfeed valve switch on P5 panel in open position. Check that valve position indicating light illuminates bright while valve is in transit and then dims to indicate valve open. Verify valve fully open position by observing indicator on valve. Also, visually check engine fuel shutoff valves to ensure no actuation.

(d)  
Place crossfeed valve switch in closed position. Check that valve position indicating light illuminates bright (valve-in-transit) and then extinguishes to indicate valve closed. Verify valve fully closed by observing indicator on valve. Also, visually check engine fuel shutoff valves to ensure no actuation.

(3)  
Restore airplane to normal.

(a)  
Open INDICATOR LTS MASTER DIMMING and MANIF VALVE circuit breakers on P6 panel, if no longer needed.

(b)  
Remove leading edge flap locks (Ref 27-81-0 MP).

WARNING:  LEADING EDGE FLAPS ARE FAST ACTING AND CAN CAUSE SERIOUS INJURY TO PERSONNEL.

(c)  
Remove electrical power if no longer required.

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Jan 20/82  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  28-22-0 Page 505 

C.  Fuel Boost Pump Test
(1)  
Prepare Fuel Boost Pump for Test

(a)  
Connect external electrical power to airplane (Ref Chapter 24).

(b)  
Check that each fuel tank contains at-least 700 pounds or 350 kilograms of fuel.

(c)  
Check that manual defueling valve is closed.

(d)  
Check that APU master switch, on forward overhead panel (P5), is in OFF position.

(e)  
Check that all fuel boost pump switches, on P5 panel, are in OFF position (Fig. 501).

(f)  
Check that crossfeed valve switch, on P5 panel, is in CLOSED position.
　
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