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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
73-21-00-003
* T3 (high pressure compressor discharge temperature)
* HPTACC sensor
* T49.5 (second stage low pressure turbine nozzle
temperature)
* P0 (inlet static pressure)
* PS3 (high pressure compressor discharge pressure).
Fuel Flow Transmitter
The fuel flow transmitter sends fuel flow information to the EEC.
The EEC sends this information to the DEUs. The DEUs then
show fuel flow along with other engine parameters.
Electronic Engine Control Alternator
The EEC alternator is the normal electrical power supply for the
EEC.
Ignition System
The EEC controls ac power from the airplane electrical power
system to operate the left and right ignition systems on the
engine. See the ignition section for more information.
(CHAPTER 74)
Fuel And Control System To Airplane Connection
The engine fuel and control system has an interface with these
airplane systems and components:
* Display electronic units (DEUs)
* Start lever stop command
* Engine fire switches
* AC transfer bus 1 or 2
* Autothrottle computer
* Thrust lever angle
* Engine strut
* Thrust reverser sleeve position.
ARINC 429 Components
The engine fuel and control system connects through the ARINC
429 bus to these components:
* Common display system display electronics units (DEUs)
* Autothrottle computer.
DEUs
The ADIRU sends total air pressure and temperature data to the
EEC. The EEC uses this data to control engine thrust.
The FMC controls the CDU. The FMC gets and sends CDU
commands to the EEC through the DEUs. The FMC also
supplies some airplane data to the EEC through the DEUs. The
CDU shows EEC maintenance data and sends commands to the
EEC to do system BITE tests.
The FDAU collects engine parameter data. It sends this data to
the flight data recorder (FDR).
ENGINE FUEL AND CONTROL - ENGINE CONTROL - INTERFACES
EFFECTIVITY
GUN ALL 73-21-00
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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
73-21-00-003
Engine Fire Switches
When pulled up, engine fire switches send a close command to
the HPSOV in the HMU. This stops metered fuel flow for
combustion.
AC Transfer Bus 1 or 2
The EEC uses the airplane transfer buses for power when it
does not receive power from the EEC alternator.
Autothrottle Computer
The autothrottle computer receives thrust lever resolver angle
(TRA) and other engine data from the EEC. The autothrottle
computer uses this data to control the thrust lever. See the
autothrottle section for more information. (SECTION 22-31)
Thrust Lever Angle Resolvers
The flight and ground crews move the thrust levers to send
engine thrust commands to the EEC. The EEC gets these
commands from the thrust lever angle resolvers (TLR). See the
engine controls section for more information. (CHAPTER 76)
Engine Strut
The engine strut gives airplane model and engine position data
to the EEC. The EEC uses airplane model information to find the
maximum certified thrust and N1 reference speeds for the
airplane. The EEC uses engine position to format the engine
maintenance message numbers that show on the CDU.
Thrust Reverser
The EEC monitors thrust reverser sleeve position. It also
controls the thrust reverser interlocks for engine reverse thrust
operation. See the thrust reverser system section for more
information. (SECTION 78-30)
Digital Control Data
The display electronics units (DEUs) send and receive airplane
digital control data from the engine fuel and control system
through ARINC 429 data buses.
The ADIRU sends total air pressure and temperature data to the
EEC. The EEC uses this data to control engine thrust.
The FMC controls the CDU. The FMC sends and receives CDU
commands to and from the EEC through the DEUs. The FMC
also supplies some airplane data to the EEC through the DEUs.
The CDU shows EEC maintenance data and sends commands
to the EEC to do system BITE tests.
The FDAU collects engine data. It sends this data to the flight
data recorder (FDR).
Other airplane systems also provide data to and get data from
the DEUs. Some of this data goes to the EEC. See the indicating
and recording systems section for more information on the data
received and sent by the DEUs. (CHAPTER 31)
ENGINE FUEL AND CONTROL - ENGINE CONTROL - INTERFACES
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