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Tight On Fuel

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Key Takeaways:

  • Fuel planning for IFR flights at maximum weight is complex, often making it challenging to meet FAA §91.167 regulations that require 45 minutes of fuel beyond the alternate, including approaches at both the destination and alternate.
  • Strictly adhering to minimum legal fuel reserves may not provide sufficient safety margins for real-world scenarios such as multiple approach attempts, holding, or unexpected delays.
  • A safer and more practical approach for long IFR trips is to plan a strategic en-route fuel stop, providing greater flexibility, peace of mind, and a more robust fuel reserve than attempting to stretch fuel to the absolute legal minimum for a non-stop flight.
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That typical one-hour fuel reserve most of us use for personal flying works great, mainly ’cause we rarely need it. In most cases, there’s four-plus hours of fuel for a two-hour flight that includes an alternate just down the road. Use a (conservative) default fuel burn to estimate it, and you’re all set. But when loaded up to max weight for a long trip requiring IFR contingency planning, fuel can get tight. That’s when we’ll just stick a suitable fuel stop in the flight plan and go, right? Sure, unless the thought of making it non-stop can trigger symptoms of get-there-itis.

Perhaps you feel a fuel planning exercise coming on. If you do, you’d be correct, but stick with this—it’ll be interesting. Let’s start with the route: Rochester, New York, to Indianapolis Metropolitan.

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