What is the general weather requirement around ETA for departure, en-route, destination and alternates?

What is the general weather requirement around ETA for departure, en-route, destination and alternates?

• A. Weather above the minimums 1 hour before and 1 hour after ETA
• B. Weather must be perfect
• C. Weather must be VFR
• D. Weather minima do not apply

Answer: (A)

The key idea is that IFR planning uses forecast weather that meets the published minima for each leg of the flight, evaluated in a window around your estimated time of arrival. Specifically, you need weather that is above the published minima for departure, en-route, destination, and any alternate, looked at a time window from one hour before to one hour after your ETA. This gives you a practical margin for the actual conditions you’ll face when you arrive, land, or decide on an alternate. In practice, that means if the forecast in that window shows ceilings and visibility at or above the approach minima for the destination (and the alternate, if applicable), you’re considered to have acceptable weather for planning purposes. If the forecast doesn't meet those minima, you’d typically delay, cancel, or select an alternate with acceptable minima. The other options aren’t correct because: weather doesn’t have to be perfect; IFR operations are not based on VFR weather alone, and minima do apply to ensure safe operation and the ability to complete a legal approach.

The key idea is that IFR planning uses forecast weather that meets the published minima for each leg of the flight, evaluated in a window around your estimated time of arrival. Specifically, you need weather that is above the published minima for departure, en-route, destination, and any alternate, looked at a time window from one hour before to one hour after your ETA. This gives you a practical margin for the actual conditions you’ll face when you arrive, land, or decide on an alternate.

In practice, that means if the forecast in that window shows ceilings and visibility at or above the approach minima for the destination (and the alternate, if applicable), you’re considered to have acceptable weather for planning purposes. If the forecast doesn't meet those minima, you’d typically delay, cancel, or select an alternate with acceptable minima.

The other options aren’t correct because: weather doesn’t have to be perfect; IFR operations are not based on VFR weather alone, and minima do apply to ensure safe operation and the ability to complete a legal approach.