VIGV/VSV
Can anyone help?
I have a report to do on a fault with a VIGV/VSV actuator to an engine. I have my fault indications.
80 kts, pilot hears a rumbling sound, Tq drops, T6 drops and Nh drops followed by a rapid increase back to normal conditions.
I think I am on the right track with a VIGV/VSV fault causing the compressor to stall followed by surging.
I just cant seem to get the technical part straight in my head, would the guide vanes have to decrease the airflow to cause the stall or merely change the angle at which it entered the compressor,
any help much appreciated.
Ross