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position signals to the EEC channels A and B.
The TBV valve has these parts:
* Actuator body
* 9th stage air valve body
* LVDT connectors (2)
* Thermal shield
* Fuel manifold mount flange.
Training Information Point
You remove the TBV valve as an assembly.
ENGINE AIR - TBV - TRANSIENT BLEED VALVE
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ENGINE AIR - TBV - TRANSIENT BLEED VALVE
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General
The EEC uses these parameters to control the transient bleed
valve (TBV) position:
* N2 speed
* T25.
Operation
The EEC uses N2 speed and T25 to calculate a corrected N2
speed.
During a start sequence, the TBV opens. It closes when
corrected N2 speed gets to idle.
During an engine acceleration, the TBV opens when corrected
N2 speed is between idle and approximately 76 percent speed.
The TBV closes when corrected N2 speed is 76 to 80 percent
speed depending on T25. When corrected N2 speed is more
than 80 percent, the TBV is closed during engine acceleration.
Training Information Point
You can see the TBV position in 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 - TBV - FUNCTIONAL DESCRIPTION
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General Description
The variable stator vanes (VSV) system controls the angular
position of these variable stator vanes:
* HPC Inlet guide vanes (IGV)
* HPC stator vane stage 1
* HPC stator vane stage 2
* HPC stator vane stage 3.
The VSV system adjusts the air flow in the HPC. This increases
the compressor efficiency and stall margin.
The VSV system has these parts:
* Two VSV actuators
* Two bellcrank assemblies
* Four actuation rings (not shown)
* Variable stator vanes.
ENGINE AIR - VARIABLE STATOR VANE (VSV) SYSTEM - GENERAL DESCRIPTION
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Component Locations
These components of the variable stator vane (VSV) system are
on the right side of the engine on the high pressure compressor
(HPC) case at the 2:00 position:
* VSV actuator
* Bellcrank assembly.
These components of the VSV system are on the left side of the
engine on the HPC case at the 8:00 position:
* VSV actuator
* Bellcrank assembly.
These components of the VSV system are around and inside the
HPC case:
* Actuation rings (4)
* HPC inlet guide vanes (not shown)
* HPC stator vanes stage 1 (not shown)
* HPC stator vanes stage 2 (not shown)
* HPC stator vanes stage 3 (not shown).
You open the fan cowls and thrust reversers to get access to the
VSV system components.
ENGINE AIR - VSV SYSTEM - COMPONENT LOCATION
　
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