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 G.  Each engine start lever is connected by cables to the start control drum. A push-pull cable assembly connects to a crank on the start control drum and extends into the engine nacelle strut and around the engine to the main engine control where it connects to the fuel shutoff lever.
 H.  Actuation of the thrust lever assemby regulates fuel flow in the main engine control. For reverse thrust, the lever assembly movement actuates the thrust reverser before increasing fuel flow. The main engine control is designed so that movement on either side of an idle band position (one side for forward thrust and one side for reverser thrust) will increase fuel flow. Thus, the direction of travel of the thrust control cables and drums is the same for decreasing forward thrust as it is for increasing reverse thrust. When reverse thrust is increased, a detent contained in the thrust lever is felt. This detent indicates that maximum normal reverse thrust has been commanded. As the reverse thrust lever is returned toward the stow position, another detent is felt. This detent indicates that further motion of the reverse thrust lever toward stow will cause the thrust reverser to stow.
 2.  Thrust Lever Assembly
_____________________
 A.  Two thrust lever assemblies on the control stand control the forward thrust and reverse thrust of the engines. Each thrust lever assembly consists of a forward thrust lever, a reverse thrust lever, a reverse thrust detent mechanism, a thrust control link, a pawl and a thrust control drum (Fig. 2). The forward thrust lever, with the reverse thrust lever attached to it, is concentrically mounted with the thrust control drum. One end of the control link is riveted to the reverse thrust lever and the opposite end is attached to the thrust control drum. An autothrottle disconnect switch and an auto-take off and go-around switch is incorporated in the thrust lever assembly (Ref Chapter 22, Auto Flight).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
REVERSE THRUST
AUTOTHROTTLE LEVER DISCONNECT SWITCH
SEE

CONTROL
PAWLSTAND WEB

FWD

IDLE

Thrust and Start Levers
Figure 2 (Sheet 1)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FORWARD THRUST
LEVER 
ROLLER ASSEMBLY 
REVERSE THRUST 
DETENT CAM  REVERSE THRUST 
LEVER 

REVERSER
CONTROL
SWITCH

COVER
FWD
B
START LEVERS
START DRUMS
SWITCH
ACTUATING
CAMS

FUEL VALVE SHUTOFF SWITCHES
115V AC
IGNITION

FWD
SWITCHES
C

Thrust and Start Levers Figure 2 (Sheet 2)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
B.  As the thrust lever is advanced from the idle position, the control link rotates the thrust control drum to actuate the main engine control to increase thrust. The forward thrust idle position is against an idle stop on the control stand cover and full forward thrust is obtained before the lever contacts the forward stop on the control stand cover.
 C.  A lockout mechanism prevents simultaneous actuation of the forward and reverse thrust levers to assure positive forward or reverse thrust control. The ability of each lever to move depends on the position of the other lever. If the forward thrust lever is more than slightly forward of the idle position, the reverse thrust lever cannot be moved more than a small travel aft from OFF. If the reverse thrust lever is moved more than a small travel from OFF with the forward thrust lever on the idle stop, the forward thrust lever cannot be moved. The lockout between the levers is a pawl, riveted to the forward thrust lever (Fig. 2). The pawl is between the thrust lever and the control link. When the forward thrust lever is in the idle position, the pawl is aligned with the lockout hole in the web of the control stand thrust lever cover. As the reverse thrust lever is moved from the OFF position, the control link forces the pawl into the hole to lock the forward thrust lever in the idle position. As the reverse thrust lever is returned to the OFF positon the control link pushes the pawl from the hole to unlock the forward thrust lever. When the forward thrust lever is more than slightly forward of the idle position, the pawl is not aligned with the lockout hole. The web then opposes the force of the control link on the pawl so the reverse thrust lever cannot be moved more than slightly aft of OFF.
　
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