FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

Question: 1 / 1030

What is the purpose of the vertical fin on an aircraft?

Increase lift

Decrease drag

Provide directional stability

The purpose of the vertical fin on an aircraft is to provide directional stability. This means that it helps to keep the aircraft flying in a straight line and prevents it from yawing or slipping to one side. Option A is incorrect because increasing lift is the purpose of the main wings on an aircraft. Option B is incorrect because decreasing drag is the purpose of streamlined design and aerodynamic features such as winglets. Option D is incorrect because controlling roll is the purpose of ailerons, which are located on the wings of an aircraft. Therefore, the correct answer is C as it specifically relates to the role of the vertical fin in maintaining the stability of the aircraft's direction during flight.

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