Some red lines are only there because of noise (engine PA36-375)
"Mike Rapoport" wrote in message
k.net...

"Jose" wrote in message
...
So, how far over redline is it "ok" to operate an aircraft, and how
arbitrary is that red line (both on the tach and the airspeed indicator)
and how is it determined?

Jose
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Nobody really knows. Redline on a piston airplane (turbines are
different)
is usually set at 90% or Vd which is the highest speed demonstrated in a
dive without flutter or other problems. This is with a new airplane with
new hinges pivots ect.

Mike
MU-2