A&P Propeller Systems and Maintenance 2

Question 1

What is the correct repair method for a small nick found on a propeller blade leading edge?

Accepted Answer

File the nick smooth and blend it into the surrounding blade contour

Answer

Small nicks are repaired by filing smooth and blending into the surrounding contour to eliminate stress concentrations that could initiate fatigue cracks.

Question 2

On a counterweight-type constant-speed propeller, what force moves the blades toward high pitch (coarse)?

Accepted Answer

Centrifugal force acting on the propeller counterweights

Answer

In counterweight-type propellers, centrifugal force acts on the counterweights mounted offset from the blade centerline, twisting the blades toward high (coarse) pitch.

Question 3

Why is dynamic propeller balancing performed in addition to static balancing?

Accepted Answer

To correct vibration from mass imbalance that only manifests at operating rotational speed

Answer

Dynamic balancing corrects vibration caused by mass imbalance that can only be detected at operating RPM, which static balancing on a mandrel cannot reveal.

Question 4

What metal is most commonly used in manufacturing modern fixed-pitch propellers?

Accepted Answer

Aluminum alloy for its favorable strength-to-weight ratio

Answer

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.

Question 5

Which condition mandates removal of a propeller from service for mandatory inspection before return to flight?

Accepted Answer

Propeller involved in a sudden engine stoppage or ground strike event

Answer

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.

A&P - Aircraft and Powerplant Certification Practice Test

A&P - Aircraft and Powerplant Certification Practice Test

A&P Propeller Systems and Maintenance 2