HARTZELL AIRWORTHINESS DIRECTIVE SIMMERED FOR FOUR YEARS
An October 16 airworthiness directive affecting some 24,320 Hartzell propellers was long in coming. As far back as mid 1992, the NTSB urged the FAA to require inspections of Hartzell hubs (B/CA, October 1992, page 28), but it wasn't until 1993-after a Mitsubishi MU-2 crash killed South Dakota's...
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