Aircraft Propeller Systems and Theory Flashcards
6 cards from real AME practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Aircraft Propeller Systems and Theory flashcards as text
What is 'blade angle' in propeller terminology?
Answer: The angle between the blade chord line and the plane of rotation
Blade angle (pitch angle) is measured between the blade chord line and the plane of rotation, determining how much air is deflected with each revolution.
'Geometric pitch' of a propeller is defined as:
Answer: The theoretical distance the propeller would advance per revolution with no slippage
Geometric pitch is the theoretical advance per revolution based on blade angle alone, whereas effective pitch accounts for actual slippage through the air.
Which FAA regulation governs the type certification of propellers?
Answer: 14 CFR Part 35
14 CFR Part 35 establishes the airworthiness standards specifically for propeller type certification in the United States.
A propeller exhibiting excessive vibration during ground runup most likely indicates:
Answer: Dynamic imbalance or damaged blades
Excessive vibration during runup typically points to propeller dynamic imbalance, a bent blade, or damage that disrupts the even distribution of rotating mass.
What is the typical repair method for minor nicks and gouges on aluminum propeller blade leading edges?
Answer: Filing the nick smooth and blending it into the blade profile
Minor nicks on aluminum propeller blades are repaired by carefully filing them smooth and blending the edges to prevent stress concentration and fatigue cracking.
What is 'propeller slip'?
Answer: The difference between geometric pitch and effective pitch
Propeller slip is the difference between the theoretical geometric pitch and the actual effective pitch, representing the propeller's inefficiency due to airflow interaction.