Airframe Mechanic Certification Flight Control Systems 5

Question 1

What is the primary cause of aileron flutter on an aircraft?

Accepted Answer

Mass imbalance of the control surface about its hinge line

Answer

Flutter occurs when the control surface's center of mass is aft of the hinge line, creating a self-exciting oscillation driven by aerodynamic forces.

Question 2

Which regulation requires that flight control systems be checked for freedom of movement and correct travel before the first flight after certain maintenance actions?

Accepted Answer

14 CFR 43.13

Answer

14 CFR 43.13 requires mechanics to perform maintenance using methods and data that ensure the work results in at least equal airworthiness, including control system checks.

Question 3

A ground-adjustable tab differs from a trim tab in that it:

Accepted Answer

Is adjusted only on the ground and cannot be moved in flight

Answer

Ground-adjustable tabs are bent to a fixed position by maintenance personnel before flight and cannot be repositioned by the pilot from the cockpit.

Question 4

What type of control system uses control signals transmitted electrically to actuators, with no mechanical linkage between cockpit controls and surfaces?

Accepted Answer

Fly-by-wire

Answer

Fly-by-wire (FBW) systems replace mechanical cables and pushrods with electrical signals sent to flight control computers, which then command hydraulic or electromechanical actuators.

Question 5

When checking a flight control system for correct cable routing, a mechanic discovers a cable routed through a fairlead at an angle greater than 3 degrees. This is:

Accepted Answer

Unacceptable and the routing must be corrected

Answer

AC 43.13-1B specifies that cables should not pass through a fairlead at an angle greater than 3 degrees, as greater angles cause accelerated wear.

Airframe Mechanic Certification Practice Test

Airframe Mechanic Certification Practice Test

Airframe Mechanic Certification Flight Control Systems 5