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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
76-00-00-040
ENGINE CONTROLS - THRUST LEVER
ENGINE CONTROLS - THRUST LEVER
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
76-00-00-040
General
You lift the start lever during an engine start sequence. You
lower the start lever to shutdown the engine. The start lever
sends signals to interfacing systems.
Start Lever
There are two start levers, one for each engine. The start lever
has two positions, IDLE and CUTOFF. A detent locks the lever in
each position. You must pull the lever out to move it from one
detent to the other. The lever connects mechanically to a brake
which gives a friction force.
Each start lever operates 6 switches. Two of the switches send
signals to the EEC. Two of the switches interface with the
engine ignition system. The other two switches send signals to
valves in the engine fuel feed system.
ENGINE CONTROLS - START LEVER
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
76-00-00-050
ENGINE CONTROLS - START LEVER
ENGINE CONTROLS - START LEVER
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
76-00-00-050
Functional Description
Each engine start lever operates six switches. These switches
are in the engine start lever brake assembly. The switches send
signals to other systems.
These actions happen when you move the start lever to the
IDLE detent position, and the switches move to the idle position:
* Fuel control panel receives an input of start lever position for
indication logic
* Electrical power opens the engine fuel spar valve
* Ignition power (115v ac) goes to the EEC
* Two engine start lever relays move to the idle position
* Integrated drive generator (IDG) manual disconnect circuit
arms
* Flight data acquisition unit (FDAU) sees the start lever in the
idle (engine run) position
* Two CDS/DEUs see the start lever in the idle (engine run)
position.
These actions happen when you move the start lever to the
cutoff position and the switches move to the cutoff position:
* Fuel control panel receives an input of start lever position
* Electrical power closes the engine fuel spar valve
* Ignition power is removed from the EEC
* Two engine start lever relays move to the cutoff position
* Electrical power closes the high pressure shutoff valve
(HPSOV) in the hydromechanical unit (HMU)
* EEC channels A and B reset.
See the engine fuel and control, engine control section for more
information on the HPSOV. (SECTION 73-21)
See the engine ignition chapter for more information on the
ignition system. (CHAPTER 74)
The EEC reset feature lets the EEC operate correctly after a
software error occurs in the EEC. See the engine fuel and
control chapter for more functional description information on
the EEC. (CHAPTER 73)
See the fuel chapter for more information on the fuel system.
(CHAPTER 28)
See the common display system section for more information
on the CDS/DEU. (SECTION 31-62)
See the flight controls chapter for more information on the flight
data acquisition unit. (CHAPTER 27)
ENGINE CONTROLS - START LEVER - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
76-00-00-055
ENGINE CONTROLS - START LEVER - FUNCTIONAL DESCRIPTION
ENGINE CONTROLS - START LEVER - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
76-00-00-055
General
The reverse thrust interlock solenoids energize to permit
further movement of the reverse thrust levers during a T/R
deploy operation. If the reverse thrust interlock solenoid does
not energize, you cannot move the reverse thrust lever and
increase reverse thrust. The solenoids energize when the T/R
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