What is the primary function of a propeller on an aircraft engine?

Prepare for the Aircraft Maintenance Technician 40 OandP Exam. Practice with flashcards and multiple choice questions. Each question is accompanied by hints and explanations to support your learning. Ace your exam with confidence!

Multiple Choice

What is the primary function of a propeller on an aircraft engine?

The propeller’s main job is to turn engine power into forward thrust by pushing air backward. Each blade acts like a rotating wing, and as it cuts through the air at a chosen pitch and RPM, it accelerates air rearward. That acceleration creates a pressure difference on the blade surfaces and, by Newton’s third law, pushes the aircraft forward. Thrust depends on engine power, blade diameter, pitch, and air density (and how fast the airplane is moving), with the power and forward speed linked by roughly P ≈ T × V in steady flight. The other functions listed are performed by different systems: stabilization comes from control surfaces like the tail, landing shocks are absorbed by the landing gear, and airspeed is measured by the pitot system.

The propeller’s main job is to turn engine power into forward thrust by pushing air backward. Each blade acts like a rotating wing, and as it cuts through the air at a chosen pitch and RPM, it accelerates air rearward. That acceleration creates a pressure difference on the blade surfaces and, by Newton’s third law, pushes the aircraft forward. Thrust depends on engine power, blade diameter, pitch, and air density (and how fast the airplane is moving), with the power and forward speed linked by roughly P ≈ T × V in steady flight. The other functions listed are performed by different systems: stabilization comes from control surfaces like the tail, landing shocks are absorbed by the landing gear, and airspeed is measured by the pitot system.

More practice questions