AMT Aircraft Propeller Systems 3

Question 1

During a propeller track check, one blade is found to be 3/4 inch lower than the others. The most likely cause is:

Accepted Answer

A bent blade

Answer

Track error exceeding acceptable limits (typically 1/16 inch for metal props) usually indicates a bent blade, which must be rejected or repaired by a certificated shop.

Question 2

Which propeller type uses aerodynamic twisting moment as the primary force to increase blade pitch?

Accepted Answer

Hydromatic (Hamilton Standard) propeller

Answer

The Hydromatic propeller design relies on aerodynamic twisting moment combined with counterweights to move blades toward high pitch, with oil pressure moving blades toward low pitch.

Question 3

A propeller with a designation of 74DM6A5 has a diameter of:

Accepted Answer

74 inches

Answer

In the propeller designation system, the first two digits represent the nominal diameter in inches; 74 = 74 inches.

Question 4

Before removing a propeller from an engine flange, the technician should FIRST:

Accepted Answer

Make a index mark on the flange and hub

Answer

Marking the hub-to-flange relationship before removal ensures the propeller can be reinstalled in the same position to maintain balance.

Question 5

The beta range of a turboprop propeller system refers to operation:

Accepted Answer

Between flight idle and maximum reverse pitch

Answer

The beta range encompasses blade angles from flight idle through flat pitch to full reverse, used for ground maneuvering and deceleration after landing.

(AMT) Aviation Maintenance Technician Practice Test

(AMT) Aviation Maintenance Technician Practice Test

AMT Aircraft Propeller Systems 3