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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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ENGINE AIR - VSV SYSTEM - COMPONENT LOCATION
ENGINE AIR - VSV SYSTEM - COMPONENT LOCATION
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
75-31-00-020
Physical Description
The VSV actuators move the IGVs and the first three stages of
HPC stators.
The VSV system has a piston type actuator. The HMU sends
servo fuel pressure to the rod side and the head side of the
piston in the actuator. The servo fuel pressure causes the piston
to move. The piston moves the bellcrank. The bellcrank moves
actuation rings and the actuation rings move the stator vanes.
The VSV actuator has a drain port to drain fuel that leaks past
the rod seal.
The LVDT of the left actuator connects to the EEC channel A.
The LVDT of the right actuator connects to the EEC channel B.
Training Information Point
You can replace one actuator or both actuators. Each actuator
connects to one bellcrank assembly. You disconnect the VSV
actuator from the bellcrank assembly to remove it.
The VSV actuators are interchangeable.
ENGINE AIR - VSV SYSTEM - ACTUATOR
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
75-31-00-030
ENGINE AIR - VSV SYSTEM - ACTUATOR
ENGINE AIR - VSV SYSTEM - ACTUATOR
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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General
The EEC uses this data to schedule the variable stator vanes
(VSV) position:
* TAT
* PT
* Ambient pressure (P0)
* N1 speed
* N2 speed
* HPC inlet air temperature (T25).
Control
The VSV system operates automatically. The EEC normally gets
TAT, PT and P0 from the ADIRUs through the display electronic
units (DEUs). The EEC gets the engine data from engine
sensors. These parameters are used to calculate the
commanded VSV position. The EEC sends a signal to the
HMU. The HMU sends servo fuel pressure to the two VSV
actuators. Each actuator connects to a bellcrank assembly. The
two actuator and bellcrank assemblies operate together to
move the variable stator vanes through 4 actuation rings. Each
actuator has a LVDT. The EEC uses the LVDTs to monitor the
position of the VSV actuators. One LVDT sends an electrical
signal to channel A of the EEC. The other LVDT sends an
electrical signal to channel B.
See the engine fuel and control section for more information on
how the EEC gets TAT, PT and P0 data. (SECTION 73-21)
Operation
The variable stator vanes are in the closed position when N2 is
at idle. They move to a more open position when N2 increases.
They are at the full open position when N2 is more than 95%.
The VSVs are commanded to a more closed position at lower
altitudes and low TAT to improve engine stability during icing
conditions. The VSVs are commanded closed when N1 or N2
speed is more than red line by more than 1 percent.
Training Information Point
You can see the VSV position in degrees on the engine
maintenance pages of the control display units (CDUs).
See the engine indicating section for more information on the
engine maintenance pages in the CDU. (SECTION 73-21)
ENGINE AIR - VSV SYSTEM - FUNCTIONAL DESCRIPTION
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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ENGINE AIR - VSV SYSTEM - FUNCTIONAL DESCRIPTION
ENGINE AIR - VSV SYSTEM - FUNCTIONAL DESCRIPTION
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