The maximum tailwind component for engine start is measured in which unit?

The maximum tailwind component for engine start is measured in which unit?

• A. Knots (kts)
• B. Miles per hour (mph)
• C. Meters per second (m/s)
• D. Feet per second (ft/s)

Answer: (A)

Tailwind component is the wind velocity along the runway direction, the amount of wind that helps the aircraft during start and takeoff. In aviation, wind speed is standardized in knots because all performance data, airspeed indicators, and runway charts use knots and nautical miles. So the maximum tailwind allowed for engine start is given in knots. Other units like mph, m/s, or ft/s aren’t used for these official limits, even though you might see them elsewhere.

Tailwind component is the wind velocity along the runway direction, the amount of wind that helps the aircraft during start and takeoff. In aviation, wind speed is standardized in knots because all performance data, airspeed indicators, and runway charts use knots and nautical miles. So the maximum tailwind allowed for engine start is given in knots. Other units like mph, m/s, or ft/s aren’t used for these official limits, even though you might see them elsewhere.