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

Lockheed Constellation piston engine airliner

Bristol Proteus turboprop engine

Boeing 707

Bristol Proteus,Bristol Britannia,free turbine,turboprop,inlet debris screen,Lockheed Constellation,Boeing 707,