Amateur-built MONNETT-MONI accident near Endicott, New York, November 3, 1984
On November 3, 1984 at about 3:40 pm local time, a amateur-built MONNETT-MONI, registered N234NS, was substantially damaged in an accident near Endicott, New York (Endicott Tri-Cities airport). It was a personal flight under general aviation rules (Part 91). 1 person was seriously injured. The weather was visual conditions (good weather).
The NTSB's probable cause their words, unchanged
The NTSB has not yet published a probable cause for this accident. Investigations usually take one to two years; this page updates when the final report is released.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- November 3, 1984 · about 3:40 pm local time
- Place
- Endicott, New York · Endicott Tri-Cities · map
- Type
- Accident
- Injuries
- 1 person was seriously injured.
- Weather
- visual conditions (good weather)
- Aircraft
- Amateur-built MONNETT-MONI MONNETT-MO
- Registration
- N234NS · no longer on the register · serial 234
- Damage
- Substantial damage
- Flight
- Personal flight · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
THE ACFT COLLIDED WITH THE TERRAIN IN AN UNCONTROLLED DESCENT FOLLOWING A PARTIAL LOSS OF POWER DURING A TAKEOFF CLIMB. THE PLT STATED THE RPM DROPPED FROM 5200 TO 4600 AT WHICH TIME HE ATTEMPTED TO LEAN THE MIXTURE. A SEVERE VIBRATION DEVELOPED AND NOT WANTING TO FLY OVER A RESIDENTIAL AREA, THE PLT INITIATED A LEFT BANK TOWARD THE ARPT. THE ACFT STALLED AND ENTERED A SPIN IMPACTING THE GROUND BEFORE RECOVERY ATTEMPTS WERE EFFECTIVE. CAUSE OF THE POWER LOSS WAS NOT DETERMINED.
The complete narrative as the NTSB published it. The NTSB's docket holds the report as a PDF and any photographs, statements and other documents from the investigation.
The factual record from the NTSB's investigation tables, in plain English
Pilot
- Certificate: private
- Ratings: rotorcraft: glider
- Flight time: 87 hours in all; 1 in this make and model
- Medical certificate: Class 3 (valid medical--no waivers/lim.)
- Seat: unk
The aircraft
- Airframe total time: 2 hours
- Last inspection: inspection type not recorded, October 16, 1984; 2 hours since
- Maximum gross weight: 274 lb
- Seats: 1
- Landing gear: fixed
- Engine: Komet KFM107E (piston); 0 hours total
The flight
- Departed from: N17 Endicott NY
- Flight plan: none
- Runway 3, 3,500 ft by 80 ft
Weather at the time
- Light: daylight
- Wind: from 025° at 3 knots
- Sky: clear
- Temperature: 0°F (-18°C), dew point 0°F (-18°C)
- Observation at 10:30 am
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Crew | 1 |
Documents from the investigation the NTSB's docket: the evidence folder behind the report
The docket, the folder of records gathered during an investigation (maintenance records, photographs, witness statements, examinations), has not been read from the NTSB for this case yet; the list appears here once it has. Open the docket at the NTSB.
Everything on this page comes from the NTSB's public records. The narrative, probable cause and findings are the NTSB's own words; the coded tables behind the report are written out in plain English, with pilots' ages, home towns and medical details left out. The documents and photographs are the NTSB's docket, shown as the NTSB released them. This site's own text never names anyone involved. A preliminary report can change; the final report usually follows one to two years later, and the page is refreshed when it does.