CHAPTER
73
Engine Fuel and Control
General
The engine fuel and control system calculates the quantity of
fuel necessary to make the commanded thrust. The engine fuel
and control system then meters the fuel and injects it into the
combustor. The engine fuel and control system also sends the
necessary fuel to the engine air system so the engine operation
is efficient and stable. See the engine air system chapter for
more information. (CHAPTER 75)
The engine fuel and control system has three subsystems:
* Fuel distribution
* Fuel control
* Fuel indication.
Abbreviations And Acronyms
* ACS - air conditioning system
* ADIRU - air data inertial reference unit
* AGB - accessory gearbox
* ASM - autothrottle servo-motor
* A/T - autothrottle
* BITE - built-in test equipment
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* BSV - burner staging valve
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* CDS - common display system
* CDU - control display unit
* CCDL - cross channel data link
* DEU - display electronics unit
* FIM - fault isolation manual
* FF - fuel flow
* EEC - electronic engine control
* EHSV - electro-hydraulic servo valve
* FWD - forward
* HPSOV - high pressure shutoff valve
* HPT - high pressure turbine
* HPTACC - high pressure turbine active clearance control
* HMU - hydro-mechanical unit
* IDG - integrated drive generator
* J - junction
* LPT - low pressure turbine
* LPTACC - low pressure turbine active clearance control
* LRU - line replaceable unit
* LVDT - linear variable differential transformer
* N1 - low pressure compressor rotor speed
* N2 - high pressure compressor rotor speed
* P - pressure
* PDL - portable data loader
* PT - total pressure
* RVDT - rotary variable differential transducer
* SAC - single annular combustor
* T - temperature
* TAT - total air temperature
* TBV - transient bleed valve
* TGB - transfer gearbox
* T/L - thrust lever
* TLA - thrust lever angle
* TLR - thrust lever angle resolver
* T/R - thrust reverser
* TRA - thrust resolver angle
* VBV - variable bleed valve
* VSV - variable stator vane
ENGINE FUEL AND CONTROL - INTRODUCTION
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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ENGINE FUEL AND CONTROL - INTRODUCTION
ENGINE FUEL AND CONTROL - INTRODUCTION
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-00-00-001
ENGINE FUEL AND CONTROL - INTRODUCTION
ENGINE FUEL AND CONTROL - INTRODUCTION
EFFECTIVITY
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D633A101-GUN Jun 10/2003
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-00-00-001
General
All engine fuel and control components are on the engine. The
airplane fuel system supplies fuel to the engine fuel and control
system. The airplane also gives and receives digital and analog
control data to and from the engine fuel and control system. The
engine fuel and control system uses this data to control the
engine and give engine status to other airplane systems.
Electronic Engine Control (EEC)
The EEC controls the engine fuel and control system. Two
channels in the EEC use input data to calculate the engine fuel
and control outputs to operate the engine.
Airplane Fuel System
The airplane fuel system supplies pressurized fuel from the
center or main tank. The fuel goes from the tank through a boost
pump and a spar valve before the fuel goes to the engine. See
the fuel system chapter for more information on the airplane
fuel system. (CHAPTER 28)
Engine Strut
The engine strut has grounds that supply the airplane model
data to the EEC. The EEC uses this to find the maximum
certified thrust for the airplane. This is different from the rated
thrust. The maximum certified thrust is the thrust the engines
will produce if the thrust levers are put against the forward
stops. The rated thrust is the maximum thrust the autothrottle
will command. The strut grounds also give the EEC the engine
position.
Thrust Reverser System
The EEC gets thrust reverser translating sleeve position from a
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