NYC91LA219 · Mooney M20F
Mooney M20F · Accident: airframe, component or system failure en route
From Washington Manassas Harry P. Davis Field (HEF) to Alpena County Regional Airport (APN)
Event
- NTSB case
- NYC91LA219
- 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
- 0 · all aircraft and ground
- Ground fatalities
- 0
- 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
- Instrument Meteorological Cond
Mooney M20F
- Aircraft type
- Mooney M20
- 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
- N3827N
- Operator
- James H. Flynn · private individual
- Onboard fatalities
- Unknown
- Route
- From Washington Manassas Harry P. Davis Field (HEF), Manassas, VATo Alpena County Regional Airport (APN), ALPINA, MI
- 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
- En route · cruise
- 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
- Airframe, component or system failure
- DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
- Substantial
Cause areas
- Engine assembly, valve, exhaust › Failure, total
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
THE AIRPLANE WAS CRUISING AT NIGHT AT 8000 FEET. THE PILOT SAID '[THERE WAS A] SUDDEN VIOLENT VIBRATION...[I] CHANGED MIXTURE, GAS TANKS, ADJUSTED PROP SETTING...NO CHANGES. PULLED POWER BACK TO REDUCE VIBRATION.' THE PILOT WAS VECTORED TOWARDS THE NEAREST AIRPORT. HE WAS ABLE TO LOCATE THE RUNWAY, BUT BECAUSE OF FOG AND LACK OF ADEQUATE VISIBILITY, HE WAS UNABLE TO DISSIPATE THE EXCESS ALTITUDE AND OVERSHOT THE RUNWAY. THE EXAMINATION OF THE ENGINE REVEALED THE NUMBER 2 CYLINDER EXHAUST VALVE FAILED BECAUSE OF FATIGUE.
Probable cause
ENGINE FAILURE RESULTING FROM THE FATIGUE FAILURE OF THE NUMBER 2 CYLINDER EXHAUST VALVE AND THE SUBSEQUENT FORCED LANDING AT NIGHT. A FACTOR RELATED TO THE ACCIDENT WAS THE RESTRICTED VISIBILITY.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record NYC91LA219
- Event ID
- 20001212X17964
- Case number
- NYC91LA219
- 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: de33e0b80209937d93cc62b4493ef365150721ccca05dc9ab3a5e3b478739b5e; retrieved 2026-09-21T15:21:57.237Z.