B. The forward thrust control system consists of a thrust lever assembly for each engine, connected to each main engine control by control cables, an engine control drum and a push-pull cable (Fig. 1). The forward thrust control system regulates the engine fuel flow and hence forward thrust.
C. The reverse thrust control system consists of a reverse thrust lever for
each engine connected to each main engine control by the same control
cables, engine control drum and push-pull cable used to control forward
thrust. However, the reverse thrust control system causes cable travel
in the opposite direction and actuates the thrust reverser. The system
regulates fuel flow to the engine and hence reverse thrust. A lockout
mechanism prevents simultaneous motion of the forward and reverse thrust
levers.
Engine Control System Component Location
Figure 1 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
THRUST CABLES
ENGINE CONTROL DRUM START CABLES START CONTROL DRUM
INBD
FWD
THRUST
CABLE PUSH-PULL START PUSH-PULL CABLE
THRUST REVERSER
____NOTE: NO. 1 ENGINE INSTALLATION FEEDBACK PUSH-PULL
SHOWN. NO. 2 ENGINE CABLES
INSTALLATION SIMILAR
A
THRUST THRUSTPUSH-PULL PUSH-PULLCABLE CABLE
START START
PUSH-PULL PUSH-PULL
CABLE CABLE
MEC FUEL MEC FUEL
CONTROL CONTROL
BOX BOX
START CONTROL CABLES WITH START CONTROL CABLES WITH
B
FIXED LOWER END FITTING ADJUSTABLE LOWER END FITTING
Engine Control System Component Location
Figure 1 (Sheet 2)
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CFM56 ENGINES
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D. An engine control drum for each engine is mounted on the forward face of the front wing spar (Fig. 1). The drum transmits engine control cable travel to the push-pull cable by means of a rack and pinion system.
E. The start control system consists of a start lever assembly for each engine, connected to each main engine control by control cables, a start control drum and a push-pull cable. The start control system energizes the ignition system and initiates fuel flow to the engine.
F. Integrated autothrottle servomechanisms are installed in the throttle control cable runs. The servomechanisms are located between floor beams at the aft end of the electronic equipment compartment. In the autothrottle mode, the system is controlled by the autothrottle computer and the throttle levers are driven through the servomechanisms (Ref Chapter 22, Auto Flight).
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