What are the payload limitations in the US for high altitude balloons for educational purposes?

10 October 2019 0 162 Report

Back in 2017 the FAA rules gave total payload weight, individual package weight, and maximum area density for payload surfaces, depending upon whether the flight were exempt or not. (In addition to the 2-flight termination devices and 50lb balloon separation requirements. Part 101D.) I cannot seem to find them now.

What are the exempt/not exempt triggers?

What are the payload weight & density limits?

How can I find them?

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