Takeoff alternate distance requirements specify not more than how long at normal cruise?

• A. Not more than 0.5 hour at normal cruise
• B. Not more than 1 hour at normal cruise
• C. Not more than 1.5 hours at normal cruise
• D. Not more than 2 hours at normal cruise

Answer: (B)

Takeoff alternate planning is built around ensuring there is a viable place to land if the destination becomes unavailable. The rule expresses this as not more than one hour of flight time at normal cruise from the departure airport. Time, not distance, is used because actual distance depends on winds, weight, and climb/level-off profiles, so flight time is a consistent way to gauge how far you can reasonably reach an alternate.

Normal cruise means the speed and altitude you would normally use for planning the enroute portion of the flight—not a high-speed or nonstandard configuration. Keeping the takeoff alternate within one hour of normal cruise ensures you have enough fuel and a practical, reachable destination for a safe diversion. Choices implying shorter or longer windows would either strain the ability to reach an alternate safely or unnecessarily limit viable options.