"Morgans" wrote in message
...

"Dudley Henriques" wrote

The Lockheed Electra sure could have used a prop AD for this one!

So there was a RPM restriction on the Electra?

What do you recall? Didn't a constant speed prop pretty much bypass it?
--
Jim in NC

I only have a vague recall on this. It came up during a safety meeting at
the Naval Test Pilots School many years ago.
If I remember right, it involved a harmonic mode (whirl I believe) not
transmitting correctly through the outboard engine mounts on the airplane.
They specified certain conditions that caused this to happen but I don't
remember what they were. I seem to recall that after the issue was addressed
by Lockheed and the mounts were redesigned, there was a further wing issue
as well that had to be dealt with.
I think Macklin will probably be the guy who can best deal with exactly what
was going on.
Dudley Henriques