For an IFR flight from CYHZ to CYMM with CYBE as the alternate, what is the earliest departure time from CYHZ?

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Multiple Choice

For an IFR flight from CYHZ to CYMM with CYBE as the alternate, what is the earliest departure time from CYHZ?

Explanation:
The key idea is that an IFR departure is allowed only when the forecast weather at the destination and at the alternate meets the required minima for the planned approach, and there’s a valid window around the estimated arrival time where those conditions hold. You choose the earliest time that satisfies both airports’ minima within the forecast window. In this scenario, the forecast shows that the destination CYMM and the alternate CYBE do not meet the necessary minima before 1100z on the 1st. By 1100z, the weather at both airports satisfies the required minima within the ETA/alternate window, so you can depart then. Earlier times (like 0600z) don’t meet the minima, making them unusable. Times later on the same day (like 1500z) would work but aren’t the earliest, and the next-day option (0000z on the 2nd) is outside the earliest window. So 1100z on the 1st is the earliest feasible departure.

The key idea is that an IFR departure is allowed only when the forecast weather at the destination and at the alternate meets the required minima for the planned approach, and there’s a valid window around the estimated arrival time where those conditions hold. You choose the earliest time that satisfies both airports’ minima within the forecast window.

In this scenario, the forecast shows that the destination CYMM and the alternate CYBE do not meet the necessary minima before 1100z on the 1st. By 1100z, the weather at both airports satisfies the required minima within the ETA/alternate window, so you can depart then. Earlier times (like 0600z) don’t meet the minima, making them unusable. Times later on the same day (like 1500z) would work but aren’t the earliest, and the next-day option (0000z on the 2nd) is outside the earliest window. So 1100z on the 1st is the earliest feasible departure.

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