DOC AIRBUS | AMM A320FVARIABLE BLEED VALVE (VBV) SYSTEM - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
1. General
The VBV system is contained on the compressor control (Ref. AMM D/O 75-30-00-00).
When the generic term "VBV Doors" is used, it means both VBV large doors and and VBV narrow doors.
To provide an increased booster surge margin during engine steady state and transient operations, part of the airflow is bled from the primary gas path into the secondary gas path through the VBV system.
The VBV system consists of:
** ON A/C NOT FOR ALL The VBV system is contained on the compressor control (Ref. AMM D/O 75-30-00-00).
When the generic term "VBV Doors" is used, it means both VBV large doors and and VBV narrow doors.
To provide an increased booster surge margin during engine steady state and transient operations, part of the airflow is bled from the primary gas path into the secondary gas path through the VBV system.
The VBV system consists of:
- Two VBV actuators
- Eight VBV door assemblies
- One VBV actuating ring
- Eight VBV ducts.
2. System Description
The main function of the Variable Bleed Valve (VBV) system is to control the airflow injected into the High Pressure Compressor (HPC).
The main function of the Variable Bleed Valve (VBV) system is to control the airflow injected into the High Pressure Compressor (HPC).