Why don't voice radio communications use FM?

Emily writes:

And yes, the official probable cause lists the heterodyne.

No, it does not, at least not if you're thinking of the NTSB reports.
The probable causes a

- Pilot in command - failed to follow approved procedures, directives,
etc. (KLM)
- Pilot in command - failed to abort takeoff (KLM)

- Personnel - Miscellaneous-personnel: Pilot of other aircraft (Pan
Am)

The first report is DCA77RA014, the second is DCA77RA014. For the KLM
flight, the probable-cause report also lists "Pilot in command -
misunderstanding of orders or instructions" as a factor.

I thought you would have known that, seeing as you know allegedly
read all these accident reports.

You can read them yourself with the NTSB IDs above.

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