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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-21-00-001
ENGINE FUEL AND CONTROL - ENGINE CONTROL - INTRODUCTION
ENGINE FUEL AND CONTROL - ENGINE CONTROL - INTRODUCTION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-21-00-001
ENGINE FUEL AND CONTROL - ENGINE CONTROL - INTRODUCTION
ENGINE FUEL AND CONTROL - ENGINE CONTROL - INTRODUCTION
EFFECTIVITY
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D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-21-00-001
Electronic Engine Control
The electronic engine control (EEC) is the main component of
the engine fuel and control system.
Control Display System / Display Electronic Unit 1 or 2
The EEC receives data from many airplane systems through the
common display system display electronic units (DEUs). The
EEC sends engine system data to the airplane. All of this data
goes through DEU 1 or DEU 2.
Autothrottle Computer
The autothrottle computer receives thrust resolver angle (TRA)
and engine maximum thrust rating data from the EEC. The
autothrottle computer uses this data to calculate thrust lever
angles (TLA). The autothrottle computer can operate the thrust
levers. See the autothrottle section for more information on auto
throttle computer control of the thrust levers. (SECTION 22-31)
Flight Compartment
Some controls in the flight compartment supply control data
directly to some components on the engine.
ENGINE FUEL AND CONTROL - ENGINE CONTROL - GENERAL DESCRIPTION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-21-00-002
ENGINE FUEL AND CONTROL - ENGINE CONTROL - GENERAL DESCRIPTION
ENGINE FUEL AND CONTROL - ENGINE CONTROL - GENERAL DESCRIPTION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-21-00-002
General
The engine fuel and control system has interfaces with many
systems and components. There are digital and analog
interfaces between the engine fuel and control system, the
engine systems, and the airplane systems.
The electronic engine control (EEC) controls the engine. The
EEC uses analog and digital input data to calculate the engine
fuel and control outputs to operate the engine. The EEC also
gives digital data to other airplane systems. This data gives
engine status.
Engine Fuel And Control System To Engine Connection
The EEC has an interface with these engine systems and
components:
* Engine identification plug
* Hydromechanical unit (HMU)
* Engine air control system
* Engine sensors
* Fuel flow transmitter
* EEC alternator
* Ignition system.
Engine Identification Plug
The EEC uses the engine identification plug for thrust rating and
other engine information.
Hydromechanical Unit (HMU)
The HMU supplies metered fuel for combustion and servo fuel
pressure for engine systems operation. The HMU gets electrical
commands from the EEC for engine fuel control. The HMU also
gets commands from the airplane start lever and fire handle
switch to control the HPSOV.
Engine Air Control
The EEC controls engine air flow for thrust and turbine
clearance control systems. This is done through the HMU
servo fuel system. These are the servo fuel systems the EEC
controls through the HMU:
* Variable stator vanes (VSVs)
* Variable bleed valves (VBVs)
* Transient bleed valve (TBV)
* Low pressure turbine active clearance control (LPTACC)
* High pressure turbine active clearance control (HPTACC).
See the engine air system section for more information.
(CHAPTER 75)
Engine Sensors
The EEC uses input data from various engine sensors to
calculate the engine fuel and control outputs for engine
operation. These are the engine sensors:
* T12 (inlet total temperature)
* PT25 (high pressure compressor inlet temperature)
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