When is a destination alternate required?

• A. 1 hour before/after ETA is less than 2,000 ft, 3 SM
• B. If destination is remote
• C. Always required
• D. Only if the aircraft is over max takeoff weight

Answer: (A)

When planning IFR flights, you need a destination alternate if the forecast at the destination is below landing minimums for the intended approach within one hour before or after your estimated arrival. The standard minimums used for this rule are a ceiling of 2,000 feet and visibility of 3 statute miles. So if the forecast shows weather worse than those values during the ETA +/- 1 hour window, you must have an alternate airport planned. This ensures you have a viable landing option if conditions at the destination deteriorate. It isn’t about whether the destination is remote, nor is it related to aircraft weight or a blanket rule that always applies.