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 3.  Engine Start Lever (Fig. 2)
__________________
 A.  Two engine start levers on the control stand are used to start the engines. Each lever controls energizing the ignition system and initiating or shutting off fuel flow to the respective engine by switch actuating cams on the start control drum. The start lever is provided with a spring-loaded detent catch which may be released by lifting the knob. The detent secures the lever in the CUTOFF and IDLE position.
 4.  Engine Control Cables
_____________________
 A.  Engine control cables consist of engine start and thrust cables which connect the engine control drum and start control drum at each engine to the respective engine start lever and thrust lever. The cables are routed from the control stand under the floor, thru the body floor beams and out along the forward face of the wing front spar to the engine control drum and start control drum. The cables consist of 3/32 diameter cable and associated end fittings. Cables located in the wing leading edge contain a short length of 1/16 inch diameter cable which acts as a fuse in the event of strut breakaway. The thrust control cables also are connected to the integrated autothrottle servomechanism.
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 76-11-00
 ALL  ú ú C01 Page 6 ú Nov 15/87
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
A 
AUTOTHROTTLE INSTALLATION TYPICAL INTEGRATED 
A  FWD 
B  MECHANISM TORQUE SWITCH CAM OUTPUT QUADRANT INPUT QUADRANT DOWEL PIN (TYP) CABLE GUARD (TYP) MECHANISM TORQUE SWITCH 
ACTUATOR ASSEMBLY  ACTUATOR ASSEMBLY 
RECEPTACLE ELECTRICAL 
B  A-A  B-B 
Integrated Autothrottle Servomechanism Figure 3 

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 ALL  ú ú C01 Page 7 ú Jun 25/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
5.  Integrated Autothrottle Servomechanism
______________________________________
 A.  The integrated autothrottle servomechanism is composed of a torque switch mechanism and an actuator assembly (Fig. 3).
 (1)  
The torque switch mechanism consists of input and output quadrants with an integral cam to operate switches, a mechanism to permit pilot override of the servo drive, a means of generating braking friction to prevent throttle creep in the manual mode, and a support framing with two removable control cable guards amd locating dowel pins.

 (2)  
The actuator assembly consists of a servo motor with reduction gearing to form the prime mover, an electromagnetic clutch, a tachometer to provide servo motor speed signal, and electronic circuitry. The output pinion from the servomotor drives the input shaft of the torque switch mechanism via the reduction gearing and the electromagnetic clutch. The electromagnetic clutch engages the servo drive to the motor output shaft.

 6.  Engine Control Drum (Fig. 1)
___________________
 A.  The engine control drum is mounted on the forward face of the front wing spar. It receives input for forward or reverse thrust from the thrust control cables connected to the thrust control drum and thrust lever in the control stand. A rack and pinion in the engine control drum translates the thrust cable drum rotation to linear motion in the push-pull cable. The flexible push-pull cable transmits linear motion to the fuel control box on the main engine control at the lower left side of the engine.
 B.  The engine control drum also receives inputs from the thrust reverser feedback push-pull cables. The thrust reverser feedback moves an interlock cam to permit thrust increase when the reverser sleeves approach the commanded position.
 7.  Start Control Drum
__________________
 A.  The start control drum is mounted on the forward face of the front wing spar adjacent to the engine control drum. It receives input for engine start or cutoff from the engine start cables connected to the start control drum and engine start lever in the control stand. The start control drum consists of a cable quadrant and output crank to which the engine start push-pull cable is attached. Rotational motion of the cable quadrant is transformed into linear motion of the push-pull cable.
　
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