Turbine overspeed, and inlet debris screens

A few viewers have asked about an exceedingly rare occurrence, and I may have recently found out a reason for this.
Another, more common comment is that we should use a screen on the inlet of the engines we test. I discuss some of the reasons we don't.

Dear nitpickers and semantics nazis: your complaints are not interesting, and will be properly handled.

Links:
Bristol Britannia turboprop airliner https://www.youtube.com/watch?v=gt_S-nj2QO0

Lockheed Constellation piston engine airliner https://www.youtube.com/watch?v=xRwSKmFoFa8

Bristol Proteus turboprop engine https://en.wikipedia.org/wiki/Bristol_Proteus

Boeing 707 https://www.youtube.com/watch?v=KIXMjwlmmO8

Видео Turbine overspeed, and inlet debris screens канала AgentJayZ