CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
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EFG
VARIABLE STATOR VANE
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
The Variable Stator Vane (VSV) system positions the The system consists of:
HPC stator vanes to the appropriate angle to optimize
HPC efficiency. It also improves the stall margin during A series of actuators and bellcrank assemblies, on both
transient engine operations. sides of the HPC case:
The VSV position is calculated by the ECU using various - Two hydraulic actuators.
engine parameters, and the necessary fuel pressure is
delivered by the HMU dedicated servo valve. - Two feedback sensors, installed in the actuators.
The VSV system is located at the front of the HP - Two bellcrank assemblies.
compressor.
- Four actuation rings (made in 2 halves).
Variable stator stages, located inside the HPC case:
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Inlet Guide Vane (IGV).
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Variable Stator Vane (VSV) stages1-2-3.
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CTC-201-152-01
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
VSV actuators.
The actuators, located at the 2 and 8 o’clock positions on the HPC case, provide an output force and motion to the VSV system, in response to fuel pressure.
They are single ended, uncushioned, hydraulic cylinders, able to apply force in both directions.
Piston stroke is controlled by internal stops.
The piston incorporates a capped, preformed packing to prevent cross-piston leakage and a wiper is provided to ensure the piston rod is dirt free.
The rod end features a dual-stage seal with a drain port and, at the end of the piston, there is an extension, which houses a bearing seat.
For cooling purposes, the head end of the piston has an orifice that allows the passage of fuel.
The VSV actuator is self-purging.
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CTC-201-154-01
EFFECTIVITY
75-32-00 Page 5
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03
CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
VARIABLE STATOR VANE
VSV linkage system.
Each VSV actuator is connected through a clevis link and a bellcrank assembly to a master rod.
The vane actuation rings are linked to the master rod in the bellcrank assembly, through slave rods.
The actuation ring halves, which are connected at the splitline of the compressor casing, rotate circumferentially about the horizontal axis of the compressor.
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