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pressure compressor (LPC) discharge air go to the secondary
airflow. During a fast deceleration, the VBV system prevents an
LPC stall. At low engine speed and during the thrust reverser
operation, the VBV system keeps unwanted materials (such as
water or gravel) out of the high pressure compressor (HPC).
This prevents damage to the engine and improves engine
stability.
The VBV doors control the LPC discharge air that goes into the
secondary airflow.
The VBV system has these parts:
* VBV actuator (2)
* Actuation ring
* Bleed doors (10) and master bleed doors (2).
ENGINE AIR - VARIABLE BLEED VALVE (VBV) SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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ENGINE AIR - VARIABLE BLEED VALVE (VBV) SYSTEM - GENERAL DESCRIPTION
ENGINE AIR - VARIABLE BLEED VALVE (VBV) SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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Component Locations
The right variable bleed valve (VBV) actuator is on the rear face
of the fan frame at the 4:00 position.
The left VBV actuator is on the rear face of the fan frame at the
10:00 position.
These components are in the fan frame:
* VBV door (12)
* Actuation ring (not shown)
* Bellcrank (12).
You open the two fan cowls and thrust reverser cowls to get
access to the VBV system components.
ENGINE AIR - VBV SYSTEM - COMPONENT LOCATION
EFFECTIVITY
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ENGINE AIR - VBV SYSTEM - COMPONENT LOCATION
ENGINE AIR - VBV SYSTEM - COMPONENT LOCATION
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Physical Description
The VBV actuator is a piston type actuator. The HMU sends
servo fuel pressure to the head and rod side of the piston to
move the piston to the commanded position. Each actuator has
a fuel manifold mount flange to connect with the
hydromechanical unit (HMU). There is one LVDT connector for
each actuator. The LVDT of the left actuator connects to EEC
channel B. The LVDT of the right actuator connects to EEC
channel A.
The VBV actuator has a drain port to drain fuel that leaks from
the shaft seal.
Training Information Point
To disconnect an actuator, you must remove a fan duct panel.
The VBV actuators are interchangeable.
ENGINE AIR - VBV SYSTEM - ACTUATOR
EFFECTIVITY
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ENGINE AIR - VBV SYSTEM - ACTUATOR
ENGINE AIR - VBV SYSTEM - ACTUATOR
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General Description
The VBV doors control the quantity of low pressure compressor
(LPC) air that mixes with the fan discharge air flow.
Physical Description
There are twelve VBV doors. Each door connects to the
actuation ring through a bellcrank. Two of the doors are called
master doors. The VBV actuators connect to the bell cranks for
the master doors. The VBV doors operate when the two VBV
actuators move the master door bellcranks. The master doors
bellcranks then move the actuation ring and the other VBV
doors.
Training Information Point
You can replace one or more VBV doors. You remove a fan duct
panel to get access to a VBV door.
The two master VBV doors with a longer bellcrank are
interchangeable.
The ten other VBV doors are interchangeable.
ENGINE AIR - VBV SYSTEM - DOORS
EFFECTIVITY
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