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CTC-201-155-02
EFFECTIVITY

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ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL

EFG

VARIABLE STATOR VANE
According to sensor signals, the ECU computes the appropriate VSV position.
The two actuators move the 4 actuation rings to change the angular position of the vanes.
Two electrical feedback sensors (LVDT), one per actuator, transmit the VSV position to the ECU to close the control loop.
The right handside feedback sensor is connected to channel A and the left handside feedback sensor to channel B.
VSV position transducer.

The position sensors are Linear Variable Differential Transducers (LVDT) and consist of two windings, one stationary, one moveable.
The moveable winding translates with the actuator rod, and the resulting voltage is a function of actuator stroke/ VSV position.
Excitation is provided by the ECU.

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CTC-201-153-02
EFFECTIVITY
75-32-00 Page 9
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
VARIABLE STATOR VANE
VSV system control.
The ECU calculates the VSV demand signal using:
-Corrected N2 speed (N2K).
-Ambient pressure (P0) for Altitude.
-Throttle Resolver Angle (TRA).
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 Fan speed (N1).

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 Total Air Temperature (TAT).

It schedules the VSV position depending on corrected N2 speed and altitude.
Adjustments are applied, depending on the following:
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The bodie condition (rapid accel/decel).

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The steady state condition.

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The transient condition (slow accel/decel).

-Environmental icing condition.
-N1 and/or N2 overspeed condition.

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ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
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TRANSIENT BLEED VALVE

EFFECTIVITY
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ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
TRANSIENT BLEED VALVE
The Transient Bleed Valve (TBV) system improves the HPC stall margin during engine starting and rapid acceleration.
Using engine input parameters, the ECU logic calculates when to open or close the TBV to duct HPC 9th stage bleed air, in order to give optimum stability for transient mode operations.
　
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