Variable Inlet Guide Vanes, with EFS

• Variable Inlet Air Vanes help guide inlet airflow to enhance engine performance.
• Assembly located in front of Low Pressure Compressor (LPC), consisting of 43 stationary leading-edge vanes and variable trailing flaps (rotate -10 to +60 degrees).
• Variable Differential Transformers (LVDTs) on actuator ring drivetwin hydraulic actuators.
• LVDTs and VIGV positions are controlled by continuous measurement of LPC inlet temperature and HPC discharge static pressure.
• If turbine has Fixed Inlet Guide Vanes, the upgrade involves adding VIGVs, Hydraulic Control Unit (HCU) (if applicable), off-engine cables, hydraulic lines and updating the software.

Together with the Enhanced Flow and Speed (EFS) upgrade, VIGVs can also increase power at full load and boost performance further.

• The VIGV assembly is mounted to the front of the Low Pressure Compressor (LPC) and consists of 43 stationary leading-edge vanes and 43 variable trailing-edge flaps.
• Twin hydraulic actuators with Linear Variable Differential Transducers (LVDT) are mounted on the on the actuator ring.
• VIGV position is controlled by continuous measurement of LPC inlet temperature and High-Pressure Compressor (HPC) discharge pressure.
• If the turbine has Fixed Inlet Guide Vanes (FIGV), the upgrade involves adding the VIGV module, a new Hydraulic Control Unit (if applicable), off-engine cables, hydraulic lines, and updating the control software.