# Accident 19990711008839A: Piper PA22108, Wright, VA, July 11, 1999

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: July 11, 1999, 14:30 local time
- Place: Wright, VA
- Damage: Substantial damage
- Phase of flight: Fcd/Prec Ldg From Cruise
- Operating rules: General operating rules (Part 91)
- Location: 37.1654° N, 79.9736° W: Placed by OpenAirDocs: center of Wright, VA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=37.1654&lon=-79.9736&mi=10
- Aircraft: N4595Z, a cancelled registration (https://openairdocs.org/deregistered/N4595Z-2003-09-22) (OpenAirDocs)
- Registry model: Piper PA-22-108 (registry code 7102204, https://openairdocs.org/model/piper-pa-22-108) (OpenAirDocs)
- Registry engine: Lycoming 0-235 series (registry code 41505, https://openairdocs.org/engine/lycoming-0-235-series) (OpenAirDocs)
- Reported make and model: PIPER PA22108
- Reported engine: LYC O320*
- People aboard: 1
- Fatal injuries: 0
- Pilot flight hours: 415 total, 350 in this make and model, 25 in the last 90 days
- NTSB investigation: [NTSB NYC99LA172](https://openairdocs.org/ntsb/NYC99LA172) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19990711008839A

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

ACFT CRASHED UNDER UNKNOWN CIRCUMSTANCES AND SUSTAINED SUBSTANTIAL DAMAGE.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      (.4)THE PILOT STATED THAT THE AIRPLANE BEGAN TO VIBRATE SLIGHTLY WHILE IN CRUISE FLIGHT, AND HE DECIDED TO RETURN TO THE AIRPORT. THE ENGINE THEN BEGAN TO SHAKE VIOLENTLY, AND THE PILOT PERFORMED A FORCED LANDING.  THE AIRPLANE LANDED SHORT, NOSED OVER, AND CAME TO REST INVERTED.  EXAMINATION OF THE WRECKAGE REVEALED THAT THE LEFT REAR CYLINDER ON THE ENGINE HAD SEPARATED FROM IT'S MOUNTING FLANGE.  THE ENGINE HAD ACCUMULATED ABOUT 13 HOURS SINCE OVERHAUL, WHEN ALL FOUR CYLINDERS WERE REPLACED ON THE ENGINE WITH CHROMED CYLINDERS PURCHASED FROM AN OUTSIDE SOURCE, THEN OVERHAULED BY THE ENGINE OVERHAUL FACILITY. DURING THE METALLURGICAL EXAMINATION OF  THE FAILED CYLINDER, A FATIGUE ORIGIN WAS FOUND NEAR THE BOTTOM OF THE FIN RADIUS, BETWEEN THE TENTH AND ELEVENTH FINS FROM THE INBOARD END OF THE CYLINDER BARREL. SEVERE CORROSION ATTACK WAS ALSO OBSERVED ON THE FIN IMMEDIATELY ADJACENT TO THE FATIGUE ORIGIN LOCATION.  CORROSION DAMAGE WAS ALSO NOTED IN THE RADIUS, INCLUDING A CORROSION PIT FROM WHICH THE CRACK ARREST FEATURES APPEARED TO EMANATE.  THE CORROSION PIT WAS FILLED WITH A NON-CONDUCTIVE SUBSTANCE.

## The NTSB's investigation of this event (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB NYC99LA172](https://openairdocs.org/ntsb/NYC99LA172), Jul 11, 1999: Piper PA-22-108 (N4595Z), Isle Of Wight, VA, substantial damage. Probable cause: The improper visual inspection of overhauled engine components by maintenance personnel.

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

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