Green Arc Red Zone

"Dudley Henriques" wrote

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.


Yeah, I remember that coming up once before, now that the whirl mode is
mentioned. I don't recall the details, either.
--
Jim in NC