BSAS 330 Module 5.3 Discussion
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Dec 6, 2023
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Hello class,
The term feathering for propeller function refers to the adjustment of the angle of a propeller's blades to
minimize parasitic drag and wind resistance when an engine is not in operation or is malfunctioning. This
adjustment prevents the unpowered propeller from creating unnecessary resistance, allowing the
aircraft to glide more efficiently. During an accident investigation, understanding feathering is crucial
because the position of the propeller blades can provide info on the engine status at the time of the
incident. If the propeller blades are found in a feathered position, it may suggest an intentional
shutdown or an engine failure.
The phrase turbine parts may have a memory refers to the concept that certain components within a
turbine engine may retain signs of stress or damage from previous incidents or operating conditions.
Investigating these "memories" can help in understanding the history of the turbine's operation and
possible causes of failure.
The critical flows in turbine engines refer to the essential combination of fuel, air, compression, ignition,
and exhaust to ensure proper performance. The cause-and-effect relationship in turbine power plant
accidents relates to disruptions or failures in these critical flows. For example, if there is a malfunction in
the fuel injection system, it can lead to an imbalance in the air-fuel mixture, potentially causing engine
failure or other issues. Using these critical flows to investigate turbine-related accidents can help identify
potential points of failure and contributing factors.
Reference
FAA. (n.d.). Airplane Flying Handbook
(FAA-H-8083-3C) Chapter 13: Transition to Multiengine Airplanes.
https://www.faa.gov/sites/faa.gov/files/regulations_policies/handbooks_manuals/aviation/airplane_han
dbook/14_afh_ch13.pdf
That is a great explanation of what feathering is. I found this article about Yeti Airlines flight 691 where
an ATR 72-500 crashed during its approach to Pokhara, Nepal in January of this year killing 72 people.
Examination of the flight data and cockpit voice recorders indicated that both engine propellers were
feathered on landing. This could mean that the aircraft had engine failure and the pilots were trying to
reduce resistance to attempt a landing or the pilot accidentally feathered them on landing causing a loss
of thrust. I wasn’t able to find the final report, but pilot error seems to be the most likely cause according
to sources.
Reference
Kaminski-Morrow, D. (2023, February 7). Yeti ATR 72 crash inquiry examines feathering of both
propellers.
https://www.flightglobal.com/safety/yeti-atr-72-crash-inquiry-examines-feathering-of-both-
propellers/151960.article
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