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What happened to the declared density altitude charts in the VFRG?

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jacobsa created the topic: What happened to the declared density altitude charts in the VFRG?

The new version of the VFRG published in Dec 2021 doesn't seem to contain the declared density altitude charts anymore. It doesn't seem to mention the use of the charts at all, in fact.

Are we not supposed to use these anymore? If not, what are we supposed to do when we don't have ambient conditions? If we are, where are the charts published?
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  • John.Heddles
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John.Heddles replied the topic: What happened to the declared density altitude charts in the VFRG?

doesn't seem to contain the declared density altitude charts

Appears they have been consigned to the waste bins of history.

From a practical point of view, you can get adequately accurate elevations from the net - eg, see the other relevant thread at

bobtait.com.au/forum/performance/6951-declared-density-charts

Between the ASA and BOM sites you can get MSL pressures and reasonably accurate OAT forecasts.

Combine these and you have a reasonable solution for light aircraft planning in the event that you can't contact someone to obtain actual temperatures and QNH.

With communications capabilities these days, the need for something like the declared data has been pretty much sidelined. Keep in mind that the declared data was developed in ancient times for a need when communications were problematic for much of the time. In any case, the declared data was a bit rough and ready, anyway.

For the exams, I'm sure that the examiner will figure out something to suit what he did previously with the declared charts.

Engineering specialist in aircraft performance and weight control.
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John.Heddles replied the topic: What happened to the declared density altitude charts in the VFRG?

If you want the declared charts, our good friend, Bosi, put a link to them here

www.pprune.org/pacific-general-aviation-...tion-question-3.html

Engineering specialist in aircraft performance and weight control.
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