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 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EFIS-REINFORCED CONTROL ú
 76-11-11 STANDS WITH A STABLIZER TRIM SHAFT WITH ú CONFIG 3 A SELF-LOCKING INSERT-AND-BOLT ú C01 Page 406
 ú  Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
ENGINE FIRE EMERGENCY SHUTDOWN - DESCRIPTION AND OPERATION
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 1.  General
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 A.  Emergency fire shutdown is initiated by receipt of a fire signal in the control cabin. The fire signal consists of a continuously sounding fire alarm bell, the lighting of the master fire warning lights on the captain's and first officer's light shield and the lighting of the applicable fire switch handle in the fire protection system module on the control stand aft electronic control panel. The alarm bell is silenced by depressing either of the master fire warning lights or the bell cutout switch on the control stand aft electronic control panel. A fire signal unlocks the corresponding fire switch handle, leaving it free to be pulled and rotated. Emergency fire shutdown consists of shutting off the engine and isolating it from the other systems.
 B.  Emergency shutoff is accomplished by moving the thrust lever to idle and positioning the start lever to cutoff, which closes the fuel shutoff valve in the main engine control and closes the engine fuel shutoff valve in the wing.
 C.  Pulling the fire switch handle will close the applicable engine bleed air valve, engine hydraulic shutoff valve, thrust reverser hydraulic isolation valve (if open), and open the generator field circuit. Closure of the engine fuel valve in the wing will also occur by pulling the fire switch if positioning the start lever to cutoff has not been accomplished (Fig. 1).
 D.  Counterclockwise rotation of the handle will discharge the left fire extinguisher bottle and clockwise rotation will discharge the right fire extinguisher bottle into the selected nacelle (Ref Chapter 26, Fire Protection).
 E.  The engine fuel shutoff valve in the wing will begin closing as soon as the start lever is positioned to cutoff or the fire switch handle is pulled. A blue FUEL 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 GEN OFF BUS and BUS OFF lights on the forward overhead panel will come on.
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 76-21-00
 ALL  ú ú C01 Page 1 ú Jun 25/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
L BOTTLE

28V DC BATT BUS
FIRE HANDLE

O.H. RELAY

CIRCUIT BREAKER GENERATOR  OFF BUS LIGHT GENERATOR 
Engine Fire Switch Schematic 
Figure 1

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 76-21-00
 ALL  ú ú C01 Page 2 ú Jun 25/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.

 

　
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