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E.  The engine fuel shutoff valve in the wing will begin closing as soon as the start lever is positioned to cutoff or fire switch handle is pulled. A blue "valve closed" light on the overhead panel will burn brightly while the engine fuel shutoff valve is in transit and will continue to burn dimly after the valve has reached the closed position.
F.  The engine bleed air valve is closed to prevent smoke from being distributed in the pneumatic system and to cut off flow to the wing thermal anti-ice system. The hydraulic supply valve will be closed and the pump low pressure warning light on the overhead panel will be de-energized. There is a 5- to 10-second delay in generator shutdown so that power will be provided long enough to close the above valves. At the time of generator shutdown, the "GENERATOR OFF BUS and BUS OFF" lights on the forward overhead panel will come on.
527 
Oct 20/83  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  76-21-0 Page 1 

Engine Fire Switch Circuit  527 
76-21-0  Figure 1  Nov 01/74 
Page 2 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

 

　
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