Instability

Question 1

What is Dutch Roll?

Answer 1

Oscillatory instability with swept wing aircraft
It is the combination of yaw and rolling motions. When an aircraft yaws, it will develop into a roll. As one side of the wing is travelling faster it will get more lift, causing roll.

Question 2

What is the recovery from a Dutch roll?

Answer 2

Opposite aileron

Question 3

How do prevent Dutch Roll?

Answer 3

Yaw Dampers

Question 4

What is spiral stability?

Answer 4

Tendency of an aircraft in a properly banked turn to return to a laterally level flight attitude at release of ailerons (Airbus doesn’t have this as its fly by wire)

Question 5

What is lateral stability?

Answer 5

Tendency of an aircraft to return to a level position after a side slip.

Question 6

What is longitudinal stability?

Answer 6

Tendency of an aircraft to return to a stable pitch position after a disturbance

Question 7

What happens to stability at higher altitudes?

Answer 7

Stability reduces due to less aerodynamic damping (except spiral stability)