Propeller Systems and Maintenance Flashcards
7 cards from real A&P practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Propeller Systems and Maintenance flashcards as text
What is the correct repair method for a small nick found on a propeller blade leading edge?
Answer: File the nick smooth and blend it into the surrounding blade contour
Small nicks are repaired by filing smooth and blending into the surrounding contour to eliminate stress concentrations that could initiate fatigue cracks.
On a counterweight-type constant-speed propeller, what force moves the blades toward high pitch (coarse)?
Answer: Centrifugal force acting on the propeller counterweights
In counterweight-type propellers, centrifugal force acts on the counterweights mounted offset from the blade centerline, twisting the blades toward high (coarse) pitch.
Why is dynamic propeller balancing performed in addition to static balancing?
Answer: To correct vibration from mass imbalance that only manifests at operating rotational speed
Dynamic balancing corrects vibration caused by mass imbalance that can only be detected at operating RPM, which static balancing on a mandrel cannot reveal.
What metal is most commonly used in manufacturing modern fixed-pitch propellers?
Answer: Aluminum alloy for its favorable strength-to-weight ratio
Aluminum alloy is the most common material for modern fixed-pitch propellers due to its excellent strength-to-weight ratio, ease of manufacture, and corrosion resistance.
Which condition mandates removal of a propeller from service for mandatory inspection before return to flight?
Answer: Propeller involved in a sudden engine stoppage or ground strike event
Sudden engine stoppage or ground strike can cause internal stress or cracks not visible externally, requiring manufacturer inspection before the propeller is returned to service.
What is the function of the 'beta range' on a turboprop propeller control system?
Answer: To allow direct manual control of blade angle below the normal governing range
The beta range allows the pilot to manually control blade pitch below the normal governing range, enabling ground fine pitch, zero thrust, and reverse pitch for ground maneuvering.
How is a propeller checked for static balance during inspection?
Answer: By supporting the propeller horizontally on a mandrel and observing if it rotates due to uneven blade weight
Static balance is checked by mounting the propeller on a horizontal mandrel; if one blade is heavier, it will rotate downward, indicating a balance correction is needed.