YESYES
15 EXAMINE THE PULLEYS IN THE
AFT LOOP.
IS A PULLEY CHAFING ON THE
PULLEY BRACKET?
MAKE SURE THAT ALL THE PULLEYS TURN FREELY. REPLACE THE PULLEYS AS NECESSARY.
Thrust Lever Binding
Figure 101 (Sheet 2)
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
PREREQUISITES:
NONE
____NOTE: DECREASED MOTION OR BACKLASH IS USUAL IN THE
SYSTEM. DECREASED MOTION IS PERMITTED PROVIDED
THAT THE CONDITIONS ARE AS FOLLOWS:
. THE THRUST LEVER ALIGNMENT IS WITHIN THE
LIMITS
. THE MEC POWER LEVER TOUCHES THE FULL FORWARD
THRUST STOP ON THE MEC BEFORE THE FORWARD
THRUST LEVER TOUCHES THE CONTROL STAND FOR-
THRUST CONTROL WARD STOP.
SYSTEM HAS DECREASED THE ENGINE GOES TO IDLE POWER WHEN THE THRUST.
MOTION LEVER IS MOVED TO THE IDLE POSTIION.
Thrust Control System Has Decreased Motion
Figure 102
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
START LEVER BINDING
PREREQUISITES: NONE
YES
0A DO THE START LEVER
FRICTION TEST
(AMM 76-11-00/501).
DOES THE LEVER PASS THE TEST?
NO
YES
1 DISCONNECT THE START CONTROL PUSH-PULL CABLE FROM
THE MEC SHUTOFF LEVER.
DOES THE START LEVER NOW MOVE FREELY?
NO
NO
2 DISCONNECT THE UPPER END OF THE PUSH-PULL CABLE FROM
THE FUEL SHUTOFF QUADRANT.
DOES THE CABLE CORE MOVEFREELY IN THE TUBE?
YES
NO
3 IN THE CONTROL STAND,
DISCONNECT THE START LEVER
LINK FROM THE START DRUM.
DOES THE START LEVER MOVEFREELY?
YES
NO
4 DECREASE THE TENSION IN THE APPLICABLE ESS( )A AND
ESS( )B CABLES.
DOES THE START DRUM IN THE CONTROL STAND TURN FREELY?
TURN FREELY. REPLACE AS NECESSARY.
Start Lever Binding Figure 103
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
PREREQUISITES: NONE
THRUST LEVER DOES NOT MOVE DURING AUTOTHROTTLE OPERATION
1 DO THE BITE TEST OF THE
AUTOTHROTTLE COMPUTER AND
MAKE A CHECK OF THE FLIGHT
FAULTS (AMM 22-04-00/101 OR
AMM 22-04-10/101 FOR EFIS).
DO YOU FIND THE FLIGHT FAULTS?
YES
NOTE:
NOTE:
NO
DURING AUTOTHROTTLE OPERATION, ASYMMETRIC THROTTLE SETTING COULD OCCUR IF THE THRUST REVERSER DOES NOT OPERATE CORRECTLY. THE REASONS FOR THIS COULD BE: . TOO MUCH FRICTION IN THE FORWARD THROTTLE-
CONTROL CABLE-LOOP THAT HOLDS THE TORQUE SWITCH IN THE OPEN POSITION. THIS CAUSES THE SYSTEM TO OPERATE AS IF THE AUTOTHROTTLE IS OVERRIDDEN BY THE PILOT
. A FAILED TORQUE SWITCH THAT COULD CAUSE THE SWITCH TO REMAIN IN THE OPEN POSITION. AS A RESULT THE SYSTEM WILL OPERATE AS IF THE AUTOTHROTTLE IS OVERRIDDEN BY THE PILOT
. AN AUTOTHROTTLE SERVO MOTOR THAT FAILS TO MOVE THE THROTTLE CABLE
. A FAILED AUTOTHROTTLE (A/T) COMPUTER THAT SENDS WRONG SIGNALS TO THE AUTOTHROTTLE SERVO MECHANISM.
FOR COMPUTERS WITH P/N 10-62017-25: THE MESSAGE "FWD LOOP-TORQ SW OPEN" IS GIVEN WHEN A TORQUE SWITCH IS OPEN FOR MORE THAN TEN SECONDS DURING A FLIGHT WHILE THE OTHER IS CLOSED.
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