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1. The engine thrust control module (TCM) is the control interface between the
operator and the engine.
2. The TCM sends signals from the fuel control switches to remote data
concentrators (RDC) and the spar valve start switch relays.
3. The TCM supplies thrust commands to the electronic engine control (EEC).
4. The engine control system interfaces with these airplane systems and
components:
- Electronic engine control (EEC)
- Common core system (CCS)
- Thrust reverser (T/R) system
- Electrical power generation System
- Air data reference function (ADRF)
- Fuel system
- Engine monitoring unit (EMU).
5. The thrust management function (TMF) in the CCS supplies command
signals to the autothrottle servomotor in the TCM.
System Description Section (SDS)
Components and Interfaces
The power control system has these components:
- Engine thrust control module (TCM)
- Fuel control module (part of the TCM).
The power control system has an interface with these components:
- Electronic engine control (EEC)
- Common computing resource (CCR) cabinets through remote data
concentrators (RDC)
- Spar valve start switch relays.
System Description
The TCM has these external parts:
- Forward thrust levers (L/R)
- Reverse thrust levers (L/R)
- Fuel control switches (L/R)
- Autothrottle disconnect switches
- Takeoff/go-around (TO/GA) switches.
The TCM has these internal parts:
- Thrust reverser interlock actuator and solenoid
- Autothrottle servo motor (ASM)
- Thrust lever angle (TLA) resolvers
- Lever latch assembly.
The thrust levers supply thrust command signals to the EECs through the TLA
resolvers. Each thrust lever mechanically connects to a TLA resolver. When
the thrust lever moves, it turns the TLA resolver. The EECs supply power to
the TLA resolvers and receive the position of the resolvers. The resolvers
send thrust lever resolver angle (TRA) data to the EECs and the common core
system (CCS) for thrust control.
When the forward thrust lever is not at idle, the lever latch holds the reverse
thrust lever down.
The thrust management function software in the CCR cabinet supplies
automatic thrust command signals to the EEC with the TLA resolver. To do
this, it turns the TLA resolver (and thrust lever) with the autothrottle servo
motor (ASM).
Reverse thrust levers supply reverse thrust when commanded by the flight
crew. When the levers are pulled, the thrust reverser sleeves deploy.
The fuel control switches send signals to the RDCs and the spar valve start
switch relays. The spar valve start switch relays use these signals to control
engine fuel flow. The RDCs also send these signals to the CCS.
The TO/GA switches send signals to the autoflight system to start the
takeoff/go-around mode. The autothrottle disconnect switches send signals to
the CCS thrust management function (TMF) to disconnect the autothrottle.
The thrust reverser interlock actuator and solenoid stops the reverse thrust
levers from movement past the reverse idle position. The interlock actuator
extends and permits movement of the reverse thrust lever when the thrust
reverser is fully deployed.