AMT Aircraft Propeller Systems 5

Question 1

When an oil-counterweight propeller loses oil pressure, the blades will move toward:

Accepted Answer

High pitch (coarse)

Answer

In a counterweight-type propeller, counterweights move blades toward high pitch (coarse); oil pressure moves them toward low pitch, so loss of oil causes blades to go high pitch.

Question 2

Which maintenance action requires weighing each propeller blade individually?

Accepted Answer

Replacing a blade in a composite multi-piece hub

Answer

When replacing a blade in a removable-blade composite hub, each blade must be weighed to select a matched-weight replacement and restore propeller balance.

Question 3

A propeller tachometer reads 300 RPM lower than the engine tachometer on a direct-drive engine. The technician should:

Accepted Answer

Suspect a slipping propeller hub or flange

Answer

On a direct-drive engine, the propeller must turn at the same RPM as the crankshaft; a large discrepancy suggests propeller slippage on the shaft.

Question 4

Corrosion found on the bore of an aluminum propeller hub should be:

Accepted Answer

Sent to a certificated propeller repair station for evaluation

Answer

Hub bore corrosion is a critical area; the propeller must be sent to a certificated repair station because improper repairs can cause hub failure.

Question 5

What happens to blade pitch in a constant-speed propeller when the aircraft descends and engine RPM tends to increase above the governor set point?

Accepted Answer

Pitch increases to absorb the additional power and maintain RPM

Answer

When RPM rises above the set point, governor flyweights open a port directing oil to increase blade pitch, adding load to bring RPM back to the selected value.

(AMT) Aviation Maintenance Technician Practice Test

(AMT) Aviation Maintenance Technician Practice Test

AMT Aircraft Propeller Systems 5