Gust factor rule: add half the gust factor to final approach speed. If winds are 15 knots gusting to 25, how many knots should you add?

Gust factor rule: add half the gust factor to final approach speed. If winds are 15 knots gusting to 25, how many knots should you add?

• A. 2 knots
• B. 5 knots
• C. 10 knots
• D. 15 knots

Answer: (B)

Gust factor rule means you add half of the gust factor to your final approach speed to account for gusts. The gust factor is the difference between gust speed and steady wind. Here, gusts reach 25 knots while the steady wind is 15 knots, so the gust factor is 25 − 15 = 10 knots. Half of that is 5 knots. Therefore, you should add 5 knots to your final approach speed.

Gust factor rule means you add half of the gust factor to your final approach speed to account for gusts. The gust factor is the difference between gust speed and steady wind. Here, gusts reach 25 knots while the steady wind is 15 knots, so the gust factor is 25 − 15 = 10 knots. Half of that is 5 knots. Therefore, you should add 5 knots to your final approach speed.