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Boeing optimum altitude and recommended altitude. Why does optimum not consider wind?

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Boeing optimum altitude and recommended altitude. Why does optimum not consider wind?

Old 20th Sep 2023, 13:05
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Boeing optimum altitude and recommended altitude. Why does optimum not consider wind?

Why is it that the optimum altitude doesn’t consider the wind?
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Old 20th Sep 2023, 17:17
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Optimum altitude is reasonably independent of weather conditions - and so can be readily determined using a fairly generic formula.
Including winds means you'll get a different answer every day - and includes data (winds at altitude) that is often not readily available.
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Old 20th Sep 2023, 17:38
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In todays it is normal SOP to download a full windprofile for the whole route. If that is available, why wouldn't the FMCG not use it?
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Old 21st Sep 2023, 06:00
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Recommended altitude wasn’t originally in our 757/67 FMCs

We had optimum and max, normally you wouldn’t want to go higher than 2000 above optimum so leaving that parameter in as a baseline is still useful
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Old 21st Sep 2023, 15:00
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Which aircraft type?

AFAIK the term optimum altitude is used across many different Boeing types, but will indicate the same parameter. It was "created" for fleets starting from the 737-classic and still remains available on ie B777 (some have the ability to upload wind data inflight, some don't). There are always wind/altitude tradeoff tables that can be used to have more correct information.

Some Boeing FMCs provide "recommened" altitudes that take wind into account for a limited section in front of the route (I believe the 777 has this indicated), as wind data is considered only a forecast.
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