Principles of Flighthard#548
Spiral instability occurs when:
A
Lateral stability is too weak relative to directional stability
B
Dutch roll amplitude increases
C
The aircraft pitches up uncontrollably
D
Directional stability overpowers lateral stability, causing an increasing bank and descending turn
CorrectExplanation
Spiral instability is a non-oscillatory divergence: strong directional stability yaws the aircraft into the sideslip, and insufficient lateral stability fails to level the wings.
Ready for a timed quiz?
Test yourself with random questions from Principles of Flight and all other ATPL subjects.
Start a Practice Quiz