Discussion
A fighter in a rapid manoeuvring task shows a short-period damping ratio of 0.22. The Level 1 requirement for that flight phase is \( 0.35 \leq \zeta \leq 1.30 \) and the Level 3 minimum is 0.15. The aeroplane is therefore
Answer: B
0.22 sits below the Level 1 lower bound of 0.35 but above the Level 3 minimum of 0.15, so the aeroplane is Level 2 on short-period damping: flyable, with compensation the pilot should not have to make in a manoeuvring task. Level 1 needs 0.35, and closing that gap is a textbook case for a pitch damper, since rate feedback raises damping without slowing the response. Level 3 is the floor rather than the verdict here. Unflyable would require the damping to fall below the Level 3 minimum or the mode to be divergent.
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