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The portion that protrudes into the airflow encloses two identical sensing elements.
One sensing element is dedicated to the ECU channel A, the other to channel B.
The mounting plate is equipped with elastomer dampers for protection against vibrations.
The sensor is secured on the fan inlet case with four bolts, and a stud ensures correct ground connection.

EFG

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CTC-201-050-02
EFFECTIVITY
SENSORS Page 15
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
ENGINE SENSORS
T 25 sensor.
The T25 temperature sensor measures the High Pressure Compressor inlet temperature, and is installed in the fan frame mid-box structure, at approximately the 5 o’clock position.
The sensor is composed of :
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A probe, which encloses two sensing elements
protruding into the airflow.

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A mounting flange, with four captive screws and a
locating pin.

 

- Two electrical connectors, one per sensing element.
-Two holes are drilled, opposite the probe airflow inlet,
to let dust out.

The locating pin on the mounting flange prevents the sensor from being mis-installed.

EFG

 

CTC-201-051-01
EFFECTIVITY
SENSORS Page 17
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
ENGINE SENSORS
Thermocouple type sensors.
Thermocouple sensors are designed to convert high temperatures into signals compatible with the ECU .
Thermocouple operation is based on the following principle :
- Two dissimilar metals, chromel (+) and alumel
(-), connected to a complete circuit, generate an
electromotive force, proportional to the difference
of temperature between a known reference (cold
junction) and a sensing junction at a temperature
to be measured (hot junction).

The hot junction is incorporated into the sensor and the cold junction is installed in the ECU.

EFG

 

CTC-201-052-01
EFFECTIVITY
SENSORS Page 19
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
ENGINE SENSORS
Compressor discharge temperature T3.
The T3 temperature sensor is installed at the 12 o’clock position on the combustion case, just behind the fuel nozzles.
Two probes, enclosed in the same housing, sense the air temperature at the HPC outlet.
The signals from both probes are directed through a rigid lead to a connector box, which accomodates two connectors, one per ECU channel.

EFG
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