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These components of the engine fuel and control system are on
the right side of the engine:
* EGT wiring harness
* TCC sensor
* Identification (ID) plug
* Engine electronic control (EEC)
* T12 sensor.
ENGINE FUEL AND CONTROL - ENGINE CONTROL - COMPONENT LOCATION - RIGHT SIDE
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-21-00-005
ENGINE FUEL AND CONTROL - ENGINE CONTROL - COMPONENT LOCATION - RIGHT SIDE
ENGINE FUEL AND CONTROL - ENGINE CONTROL - COMPONENT LOCATION - RIGHT SIDE
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Purpose
The dual temperature PT25 sensor supplies high pressure
compressor (HPC) inlet temperature data to the EEC. The EEC
uses the T25 temperature information to control these
components:
* Transient bleed valve (TBV)
* Variable bleed valve (VBV)
* Variable stator vanes (VSV).
The PT25 sensor has two electrical connections that supply data
to both EEC channels.
Location
The PT25 sensor is at the 6:00 position on the inner wall of the
fan frame under the fan duct panel.
Functional Description
There are two platinum elements in the PT25 sensor assembly.
One element is for channel A, the other is for channel B. The
EEC supplies a constant voltage power supply to the T25 sensor
elements. The elements change resistance to the electrical
current in proportion to air temperature. The different output
voltages from the platinum elements goes to the EEC. The EEC
measures the difference between the constant output voltage
and input voltage from the sensor. The EEC converts the
difference into a HPC inlet temperature.
ENGINE FUEL AND CONTROL - ENGINE CONTROL - PT25 SENSOR
EFFECTIVITY
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73-21-00-006
ENGINE FUEL AND CONTROL - ENGINE CONTROL - PT25 SENSOR
ENGINE FUEL AND CONTROL - ENGINE CONTROL - PT25 SENSOR
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-21-00-006
General
The T12 sensor supplies fan inlet total temperature data to the
EEC when the airplane is on the ground and for five minutes
after takeoff. In-flight and more than five minutes after takeoff,
the EEC uses these to calculate the selected total temperature:
* T12 from the active EEC channel
* T12 from the standby EEC channel
* Total air temperature from ADIRU 1
* Total air temperature from ADIRU 2.
The EEC uses total temperature to control these:
* Engine thrust management
* Variable bleed valve (VBV)
* VSV and LPTACC systems.
Location
The T12 sensor is at the 2:30 position in the engine inlet cowl.
The T12 sensor probe extends into the air that flows to the fan.
An access panel on the outer right side of the inlet cowl
supplies access to the T12 sensor.
Two electrical connectors connect the T12 sensor to the EEC.
The connectors are in the inlet cowl assembly. They let you
remove and install the sensor quickly.
Functional Description
There are two platinum elements in the sensor assembly. One
element is for channel A, the other is for channel B.
The EEC supplies a constant voltage power supply to the T12
platinum sensor elements. The elements change resistance in
proportion to air temperature. The output from the platinum
elements goes to the EEC. The EEC measures the difference
between the constant output voltage and input from the sensor.
The EEC converts the difference into a fan inlet temperature.
ENGINE FUEL AND CONTROL - ENGINE CONTROL - T12 SENSOR
EFFECTIVITY
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D633A101-GUN Oct 10/2002
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
ENGINE FUEL AND CONTROL - ENGINE CONTROL - T12 SENSOR
ENGINE FUEL AND CONTROL - ENGINE CONTROL - T12 SENSOR
EFFECTIVITY
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