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D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-21-00-007
General
The T3 temperature sensor is a thermocouple that measures
9th stage compressor discharge air temperature. The T3 sensor
sends this temperature data to the EEC.
GUN ALL PRE SB CFM56-7B 73-44
The EEC uses T3 temperature data to control the burner staging
valve (BSV) and the high pressure turbine active clearance
control (HPTACC).
GUN ALL POST SB CFM56-7B 73-44
The EEC uses T3 temperature data to control the high pressure
turbine active clearance control. (HPTACC)
GUN ALL
Functional Description
The bi-metallic sensor makes a milliamp (mA) current
proportional to temperature. When temperature increases, the
current increases. When temperature decreases, the current
decreases.
ENGINE FUEL AND CONTROL - ENGINE CONTROL - T3 SENSOR
EFFECTIVITY
GUN ALL 73-21-00
Page 22
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
73-21-00-008
ENGINE FUEL AND CONTROL - ENGINE CONTROL - T3 SENSOR
ENGINE FUEL AND CONTROL - ENGINE CONTROL - T3 SENSOR
EFFECTIVITY
GUN ALL PRE SB CFM56-7B 73-44 73-21-00
Page 23
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
73-21-00-008
ENGINE FUEL AND CONTROL - ENGINE CONTROL - T3 SENSOR
ENGINE FUEL AND CONTROL - ENGINE CONTROL - T3 SENSOR
EFFECTIVITY
GUN ALL POST SB CFM56-7B 73-44 73-21-00
Page 24
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
73-21-00-008
Purpose
The turbine clearance control (TCC) sensor supplies the EEC
with temperature data from the high pressure turbine (HPT)
shroud. The EEC uses the milliamp (mA) signal from this sensor
to control the high pressure turbine active clearance control
valve.
See the air chapter for more information on the HPTACC
system. (CHAPTER 75)
Location
The TCC sensor is on the engine at the 3:00 position. The
sensor is on the HPT case. To get access to the sensor, open
the right fan cowl and thrust reverser cowl.
Physical Description
The TCC sensor is a thermocouple. The sensor extends from
the engine case to the HPT shroud. A metal shim below the
sensor controls the depth the thermocouple goes into engine
case.
ENGINE FUEL AND CONTROL - ENGINE CONTROL - TCC SENSOR
EFFECTIVITY
GUN ALL 73-21-00
Page 26
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
73-21-00-009
ENGINE FUEL AND CONTROL - ENGINE CONTROL - TCC SENSOR
ENGINE FUEL AND CONTROL - ENGINE CONTROL - TCC SENSOR
EFFECTIVITY
GUN ALL 73-21-00
Page 27
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-21-00-009
General
The electronic engine control (EEC) is the primary control for
the engine. The EEC uses digital and analog signals from the
engine and other airplane systems to control and monitor the
engine. The EEC sends engine data to other airplane systems.
EEC Electrical Connections
There are electrical connectors on the EEC. The EEC uses
these connectors to receive and send data to the airplane, and
engine. The connectors are J1 to J10.
The engine identification plug connects to P11. The
identification plug supplies the EEC with engine configuration
data.
EEC Air Connections
The EEC also has air connections. These air connections get air
pressures from different places on the engine. The sensors that
change air pressure to a digital signal are part of the EEC.
These are the air pressure signals:
* P0 (outside air static pressure)
* PS13 (fan exit static pressure)
* P25 (high pressure compressor inlet pressure)
* PS3 (HPC discharge).
The EEC gets P0 from the ADIRUs and from the P0 pressure
transducers in the EEC. Each EEC channel has a P0 transducer.
The EEC senses P0 through an open port on the bottom of the
EEC. Because the P0 sense port for the EEC is inside the fan
　
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