Aviation Institute Of Maintenance (AIM) Block 16 Practice Exam

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What is the blade movement for blades of a feathering propeller that is in the HIGH RPM position when feathering action begins?

From high pitch to low pitch From mid pitch to low pitch From low pitch through high pitch to feather From feather to high pitch

Correct Answer:

From low pitch through high pitch to feather

Explanation:

Feathering a propeller is about turning the blades to a high pitch to minimize drag when the engine isn’t driving them. If the propeller is in the HIGH RPM position, the blades start at a relatively low pitch to allow the engine to reach or maintain high speed. When feathering begins, the mechanism increases the blade angle, moving first into a higher pitch range and then all the way to the feather position. So the movement is from low pitch, through high pitch, to feather.

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