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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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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