Which condition would disqualify an airport from being used as an alternate airport?

• A. Forecast weather below derived alternate minimums at ETA
• B. The destination has an operating control tower
• C. The flight will depart in VMC
• D. The aircraft is turbo jet

Answer: (A)

The key idea is that when you designate an alternate, the forecast weather at the ETA must meet the published alternate minimums. If the forecast at ETA is below those derived alternate minimums, that airport can’t be used as an alternate because there wouldn’t be a guaranteed safe landing option if the destination becomes unavailable.

The other factors don’t affect whether an airport can be used as an alternate: an operating control tower status doesn’t prohibit or require something special for alternates; starting in visual meteorological conditions doesn’t determine alternate eligibility, and the type of aircraft (turbojet or otherwise) doesn’t change the weather-based minimums for an alternate.