CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
ENGINE SENSORS
Speed sensors. Pressures.
LP rotating system speed, N1. Ambient static pressure, P0.
HP rotating system speed, N2. HPC discharge static pressure, PS3 or CDP. Engine inlet static pressure, PS12.
Resistive Thermal Device (RTD sensors). Fan discharge static pressure, PS13 (optional). HPC inlet total pressure, P25 (optional).
Fan inlet temperature, T12.
High Pressure Compressor inlet temperature, T25. The pressures are measured through transducers (quartz capacitive pressure sensors) located in the ECU.
Thermocouples. Vibration sensors.
Compressor discharge temperature, T3.
Exhaust Gas Temperature, EGT or T49.5. There are two vibration sensors, which are installed
LPT discharge temperature, T5 (optional monitoring kit). on the engine and connected to the Engine Vibration
HPT shroud support temperature, T Case. Monitoring Unit (EVMU).
Engine Oil Temperature, TEO.
EFG
CTC-201-045-02
EFFECTIVITY
SENSORS Page 5
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03
CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
ENGINE SENSORS
Speed sensor design.
The speed sensors provide the ECU channels A and B with signals that are representative of the rotational speeds, N1 and N2.
On each sensor, a third connector allows signals to be sent to the EVMU for vibration analysis, in conjunction with data from the vibration sensors.
Both N1 and N2 speed sensors operate on the same principle.
They are induction type tachometers, which provide electrical output signals.
These outputs are Alternating Current (AC) signals, and the frequency is directly proportional to the rotational speed of the dedicated rotor.
The sensing element is an electrical winding with a core made up of a permanent magnet. Both sensors feature three independent sensing elements insulated from each other, thus there is one output signal per connector.
The passage of a sensor tooth ring modifies the magnetic
field around the core of the winding and causes a
magnetic flux variation in the coil.
Each tooth induces a pulse into the coil, and therefore,
the number of pulses is proportional to the sensor ring
speed.
Note : N1 sensor ring features 30 teeth. N2 sensor ring features 71 teeth.
EFG
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CTC-201-046-01
EFFECTIVITY ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION
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SENSORS Page 7
ENGINE SYSTEMS Jan 03
CFM56-5B TRAINING MANUAL
EFG
ENGINE SENSORS
N1 speed sensor.
The N1 speed sensor is mounted through the 5 o’clock
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