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When you move the reverse thrust lever, the force goes to the
crank through the control link.
The thrust lever lock pawl prevents the operation of the forward
thrust lever and the reverse thrust lever at the same time. The
pawl must move into a hole on the control stand web for the
reverse thrust lever to move. The pawl can move into the hole
only when the forward thrust lever is in the idle position.
When the forward thrust lever is not at idle, the pawl locks the
reverse thrust lever at the STOW position. This prevents the
movement of the reverse thrust lever when the forward thrust
lever is not in the idle position.
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EFFECTIVITY
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When the forward thrust lever is at idle, the pawl unlocks the
reverse thrust lever. You can move the reverse thrust lever. If
you move it, the pawl locks the forward thrust lever.
Training Information Point
You adjust the length of the rod to change the relationship
between the thrust lever position and the resolver position.
Refer to the airplane maintenance manuel (AMM) part II for
more information on this procedure.
You measure the friction force to move the thrust levers to make
sure the force is within limits. Refer to the Fault Isolation
Manual for more information on this procedure.
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ENGINE CONTROLS - THRUST LEVER
ENGINE CONTROLS - THRUST LEVER
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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.
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ENGINE CONTROLS - START LEVER
ENGINE CONTROLS - START LEVER
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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
　
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