What is the speed range for Aircraft Performance Category E?

• A. 150-200 kt
• B. 160-210 kt
• C. 166-210 kt
• D. 180-220 kt

Answer: (C)

Speed envelopes for aircraft performance categories define the operating window where the airplane’s performance and structural limits are certified for that category. For the fastest, high‑performance category, the defined envelope is from 166 to 210 knots. The lower bound sits above the stall characteristics of this class, giving a safe margin when the airplane is clean, while the upper bound sits below the limit where dynamic pressure and structural or handling limits become unsafe. So 166–210 knots is the range that matches the category’s certified operating limits. The other ranges either start too low or end too high to align with this standard envelope.