Sep 26, 1990
Accident
Destroyed THORNTON, MS
Injuries1 fatal
Phase of Flight-
ConditionsVMC
OperationFAR 137
Probable Cause
THE IMPROPER DRILLING OF A HOLE IN THE SPAR CAP BY A MECHANIC RESULTING IN THE INITIATION OF FATIGUE CRACKING IN THE SPAR CAP AND SUBSEQUENT FAILURE OF THE SPAR CAP AND INFLIGHT SEPARATION OF THE WING.
NTSB MIA90FA190