Jim Macklin wrote:
Reports I saws this morning said that the NTSB said they
found a fatigue crack in the main spar, maybe the conversion
was not done well or the maintenance was not though enough.
I'll bet the fleet is grounded and they require immediate,
"before further flight" NDT inspections of the wings, etc.

Chalk's has voluntarily grounded thier Mallards and is performing an exhaustive
test of the spars on one of them now. The NTSB rep voiced the opinion that age
alone would not be sufficient to cause this failure; some additional stress
would be required.

George Patterson
Coffee is only a way of stealing time that should by rights belong to
your slightly older self.