NYC83FA110 · Grumman American AA5B
Grumman American AA5B · Accident: partial loss of engine power (mechanical failure) en route
From Westchester County Airport (HPN) to N88 · Doylestown, PA
Event
- NTSB case
- NYC83FA110
- 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
- Charter & commuter
- 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
Grumman American AA5B
- Aircraft type
- Grumman American AA5
- 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
- N28426
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From Westchester County Airport (HPN), White Plains, NYTo N88 · Doylestown, PA
- 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 135: Air Taxi & Commuter
- 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
- Partial loss of engine power (mechanical failure)
- Also codedOther events the NTSB coded in the sequence, such as a wire strike after a loss of power. Flight Findings uses them for its kinds of event. Glossary
- Tree(s)
- 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, intake › Failure, total
- Pilot in command › Distance, misjudged
- Pilot in command › Go-around, attempted
- Pilot in command › Proper touchdown point, exceeded
Approximate · Estimated position: the centre of Bedminster, NJ, the place the record names. Not the accident site.
NTSB narrative
THE ACFT CRASHED INTO TREES DURING A FORCED LANDING AFTER A LOSS OF POWER WHILE ENROUTE FROM WHITE PLAINS. THE ENGINE STARTED TO SHAKE AND THE RPMS DECREASED. THE PLT INITIATED EMERGENCY PROCEDURES BUT THE ENGINE CONTINUED TO RUN ROUGHLY.A DECISION WAS MADE TO LAND AT SOMERSET ARPT. THE LANDING APPROACH WAS HIGH AND THE PLT ELECTED TO GO AROUND. THE ENGINEPOWER WAS NOT ENOUGH AND A FULL STALL FLAPS UP LANDING WAS MADE INTO THE TREE TOPS. THE ACFT SLID DOWN THE TREES AND STOPPED IN A PAST VERTICAL NOSE DOWN POSITION. DURING A POST ACCIDENT ENGINE EXAMINATION THE #1 CYLINDER HAD NO COMPRESSION. THE EXHAUST VALVE WAS BROKEN AND THE VALVE HEAD WAS NOT FOUND. THE CYLINDER EXHAUST VALVE GUIDE MEASURED .515. THE SPECIFICATION WHEN NEW IS .4985. THE SERVICE LIMIT IS .4995.
Verbatim NTSB analysis from the NTSB dataset
Sources
NTSB record NYC83FA110
- Event ID
- 20001214X43110
- Case number
- NYC83FA110
- 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: 0278cb995ff40cf6f56b11daac8097ad2b2871df8bf976cfbfa99ccf0ee63e44; retrieved 2026-09-18T20:59:22.216Z.