NYC01FA141 · Cessna P210N
O & N Aircraft Modifications Cessna P210N · Accident: total loss of engine power (mechanical failure) while maneuvering
From Seamans Field (9N3) to an unrecorded destination
Event
- NTSB case
- NYC01FA141
- Event typeAccident: someone killed or seriously injured, or the aircraft substantially damaged (NTSB definition). Incident: an occurrence that affected or could have affected safety, short of that. Glossary
- Accident
- InvestigationHow far the investigation had got when the record was published: preliminary, ongoing, final or completed. Unknown where the source does not say. Glossary
- Completed
- API-reported fatalities
- 3 · all aircraft and ground
- Ground fatalities
- Unknown
- OperationWhat kind of flying it was, grouped by the rules it flew under: airline (US Part 121), air taxi and commuter (Part 135), general aviation (Part 91 and similar), military or government. Glossary
- General aviation
- WeatherVisual meteorological conditions (VMC): good enough to fly by looking outside. Instrument conditions (IMC): cloud or low visibility, flying by instruments. Glossary
- Visual Meteorological Cond
Cessna P210N
- Aircraft type
- Cessna 210
- Category
- Airplane
- RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
- N450M
- Operator
- O & N Aircraft Modifications
- Onboard fatalities
- Unknown
- Route
- From Seamans Field (9N3), Factoryville, PATo not recorded
- Aircraft age
- Not recorded
- Flight rulesThe regulations the flight operated under: in the US, Part 91 (general aviation), Part 121 (airlines), Part 135 (air taxi and commuter) and others; for flights abroad, the NTSB's coarser commercial or non-commercial code. Glossary
- Part 91: General Aviation
- Phase of flightThe stage of the flight when things started to go wrong: standing, taxi, takeoff, initial climb, en route, maneuvering, approach or landing. Glossary
- Maneuvering
- First occurrenceThe single coded event the NTSB judges best describes what happened (records from 2008 on). Older records name the first occurrence in the sequence instead. Glossary
- Total loss of engine power (mechanical failure)
- DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
- Destroyed
Cause areas
- Manufacturer › Material inadequate
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
The sales demonstration pilot was in the right seat and the prospective buyer was in the left seat. About 1 1/2 hours after takeoff, while in cruise flight at an altitude estimated by a witness to be between 3,000 feet and 3,500 feet, an explosion occurred in the engine compartment, and white smoke began emanating from the exhaust stacks. The airplane circled down to a forced landing in an area of rolling hills, farms, and pastures bordered by stone walls embedded with trees. As the airplane was nearing the ground, a witness saw it make a sharp left turn, then impact trees and a stone wall between two pastures. Area winds at the time of the accident were calm. The airplane was equipped with an overhauled Allison (Rolls Royce Corporation) 250-B17F2 engine which had been installed 9 months, and about 25 operating hours earlier. Teardown examination of the engine after the accident revealed a tri-burst of the third stage turbine wheel, due to an overspeed of N2 after a sudden loss of load on the power train. It also revealed a failure of the torquemeter gearshaft, from a crack which initiated in an area of intergranular separation, and subsequently progressed in high cycle fatigue. The intergranular separation resulted from "stress corrosion mechanisms during the AMS 2485 black oxide treatment [process]." The torquemeter gearshaft had been installed during the engine overhaul.
Probable cause
An improperly manufactured torquemeter gearshaft assembly, which resulted in gearshaft assembly failure, an N2 overspeed, and a subsequent uncontained engine failure.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record NYC01FA141
- Event ID
- 20010620X01225
- Case number
- NYC01FA141
- Dataset
- historical-pre2008
- Source SHA-256
- 89e2df6d848e7ab3b42e7d7c7a03ff403303057a26ca04c95b3ea67201c3ce74
Source notes (4)
- Unreviewed is an editorial label, not an investigation status. API-sourced is not report-checked or human-reviewed. Explicit event totals are used without summing aircraft injury tables; onboard allocation is withheld. Unknown values remain unknown. The operation category is mapped from the NTSB-reported FAR part and has not been reviewed.
- Filled from the NTSB case API where the bulk record had no value: investigation status. Values present in the bulk record are kept.
- The date is the local date, which is the same as the UTC date the NTSB stores.
- API snapshot SHA-256: c249bafd8b462a14dc5a2f720b33da1e15a92d07ab579a19e358bb3b0af437ee; retrieved 2026-09-20T20:30:55.294Z.