Sound Spectrum Analysis
PDF, 3 pages from the NTSB's investigation of the American Champion Aircraft 8KCAB accident near Marengo, Wisconsin, October 23, 2021. Shown as the NTSB released it (from this site's copy).
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About this document
It is item 11 in the NTSB's docket for case CEN22FA019, titled "Sound Spectrum Analysis" by the NTSB, 3 pages. The NTSB removes some personal details before releasing docket documents; this site shows them as released and does not alter them. The docket at the NTSB.