5-3 Compressor Stalls Review SQ

What are some indications of a compressor stall?
- Mild pulsations
- Engine vibrations
- Loud bangs
- Drop in RPMs
- Rise in turbine temperature
What causes a compressor stall?

Excessive compressor blade AOA
Other than mechanical malfunctions, what causes most stalls?

Airflow distortions
What determines the angle of attack on a compressor blade?
- The angle between the chord line of the rotors and the relative wind.
- The relative wind is comprised of the inlet airflow and the compressor RPM
List some flight conditions that could cause a compressor stall.
- Abrupt attitude change
- Flight through turbulent air
How can FOD affect compressor performance?

Adversely due to compressor blade deformation
What automatically compensates for acceleration and deceleration schedules to help prevent stalls?

Fuel Control Unit (FCU)
How can an exhaust nozzle cause a compressor stall?
- (Only applies to variable exhaust nozzle)
- It could fail to open, causing a back pressure and reverse flow back through the compressor
What are some of the ways manufacturers decrease the possibility of stalls?
- Incorporating Split-spool compressor
- Bleed air valves
- Variable inlet guide vanes
- Variable exhaust nozzle
What should a pilot do to avoid compressor stalls?
- Avoid rapid and unnecessary PCL movements.
- Maintain at least minimum prescribed airspeeds
What should be done if a stall cannot be controlled?

Execute engine failure procedures

Author

dundane

320951

Card Set

5-3 Compressor Stalls Review SQ

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Study Questions

Updated

2016-06-16T14:45:45Z

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