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

Apply aviation epoxy filler to the nick and sand to the original profile

Answer

Replace the propeller blade regardless of nick depth or location

Answer

Weld the nick closed using approved filler rod and refinish the blade

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

Engine oil pressure directed into the propeller cylinder

Answer

Governor flyweight spring tension acting on the pitch change mechanism

Answer

A coarse-pitch spring assembly installed inside the hub

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

To verify blade angle uniformity across all blades at operating RPM

Answer

To confirm propeller track is within manufacturer-specified tolerances

Answer

To ensure the propeller hub assembly is properly sealed against oil leakage

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

Stainless steel for superior corrosion resistance

Answer

Titanium alloy for high strength at reduced weight

Answer

Magnesium alloy for minimum blade weight

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

Minor leading edge erosion pitting from normal service exposure

Answer

Light surface corrosion identified visually on the blade shank area

Answer

Blade tip rounding exceeding 1/2-inch radius during normal operation

Question 6

What is the function of the 'beta range' on a turboprop propeller control system?

Accepted Answer

To allow direct manual control of blade angle below the normal governing range

Answer

To provide reverse thrust capability during the landing roll only

Answer

To automatically feather the propeller upon engine failure detection

Answer

To hold blade pitch fixed at a preset angle during cruise flight

Question 7

How is a propeller checked for static balance during inspection?

Accepted Answer

By supporting the propeller horizontally on a mandrel and observing if it rotates due to uneven blade weight

Answer

By installing it on the aircraft and measuring airframe vibration at engine idle

Answer

By spinning the propeller on a dedicated test stand and recording vibration sensor data

Answer

By individually weighing each blade and comparing their measured masses