Engineering Science Mid Term

Positive stability in an aircraft is its tendency to return to its original _________ when displaced.

What happens to the rotor system in a helicopter when the pilot raises or lowers the collective control?

• The engine goes to max power or idle

• The thrust of the tail rotor increases or decreases

• The pitch angle of the rotor blades increase or decrease as a whole unit

• The swash plate tilts right or left to alter the pitch of individual rotor blades

True or False. Pitch stability refers to the movement of an aircraft’s nose up and down around its lateral axis.

• True

• False

The _________ yaws the airplane left or right.

Which of the following are the three axes of flight? Select the three answers that apply.

• Tail axis

• Longitudinal axis

• Forward axis

• Lateral axis

• Vertical axis

Which of the following are ways that a control input can be transmitted to a control surface? Select all that apply. (5.B.1)

• Hydraulic pressure

• Wind tunnels

• Electronic signals

• Anti-torque pedals

• Cable and pulley

How are flaps used during flight? Select all that apply. (5.B.2)

• They increase lift

• They are retracted at cruising altitude

• They reduce drag during takeoff

• They are retracted during descent

• They are extended during landing

Trim systems are designed to ____________. (5.B.2)

When a leading edge device is lowered, it increases the wing’s __________. (5.B.2)

• center of gravity.

• camber.

• dihedral.

• all of the above

Which of the following is not a primary flight control surface? (5.B.1)

• Ailerons

• Flaps

• Elevator

• Rudder