On May 22, 2000, a Piper PA-32R-300 (registration N424TP) operated by Brian J. Inskeep was involved in an aviation accident near Erie, CO. Investigators recorded the probable cause as: Improper installation of cylinders by unknown maintenance personnel who failed to torque the cylinder stud nuts sufficiently. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
An aircraft experienced a total loss of engine power during climb on an IFR flight plan in visual conditions, about 10 minutes after takeoff. A forced landing in an open field resulted in no damage. Investigation found the number 2 cylinder separated from the case due to failed hold-down studs.
Accident Details
During climb to cruise on an IFR flight plan in visual conditions, the engine lost all power approximately 10 minutes after takeoff. The pilot executed a forced landing in an open field, and no damage was incurred during the landing.
Investigation Findings
Examination of the engine revealed that the number 2 cylinder had separated from the case and lodged in the cowl. Detailed examination showed that the cylinder hold-down studs had failed and were 'necked-down' at the fracture points. The rod bolts subsequently failed, and the piston reversed itself and lodged in the case. No signatures of oil starvation or heat distress were found.
Further examination at an engine overhaul facility provided evidence that none of the hold-down stud nuts on the remaining five cylinders had sufficient torque.