Is there a limit to how far away the destination alternate can be?

Is there a limit to how far away the destination alternate can be?

• A. Within 1 hour flight
• B. There is no limit, aside from fuel
• C. Within 3 hours
• D. It must be within 100 miles

Answer: (B)

There isn’t a fixed distance limit for how far away a destination alternate can be; the only real constraint is fuel. The purpose of an alternate is to provide a safe landing option if the destination becomes unusable, so you plan it around what you can reach with the fuel you’ve planned for, including reserves and expected winds. You also must ensure you can descend and land at the alternate under its weather and approach minimums. In short, distance is flexible—what matters is having enough usable fuel to get to the alternate and land safely, not meeting a specific mileage or time radius.

There isn’t a fixed distance limit for how far away a destination alternate can be; the only real constraint is fuel. The purpose of an alternate is to provide a safe landing option if the destination becomes unusable, so you plan it around what you can reach with the fuel you’ve planned for, including reserves and expected winds. You also must ensure you can descend and land at the alternate under its weather and approach minimums. In short, distance is flexible—what matters is having enough usable fuel to get to the alternate and land safely, not meeting a specific mileage or time radius.