Cessna 310Q accident near Havre, Montana, July 27, 1984
On July 27, 1984 at about 11:20 pm local time, a Cessna 310Q, registered CGONG, was substantially damaged in an accident near Havre, Montana. It was a personal flight under general aviation rules (Part 91). No one was hurt; 7 people were on board or involved. 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
- July 27, 1984 · about 11:20 pm local time
- Place
- Havre, Montana · map
- Type
- Accident
- Injuries
- No one was hurt; 7 people were on board or involved.
- Weather
- visual conditions (good weather)
- Aircraft
- Cessna 310Q · all 310Qs on the register
- Registration
- CGONG · no longer on the register · serial 1048
- Damage
- Substantial damage
- Flight
- Personal flight · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
DURING CRUISE FLIGHT WITH FIVE ADULTS AND TWO INFANTS ON BOARD, THE PILOT NOTED LEFT ENGINE OIL PRESSURE DECREASING AND A VISIBLE OIL LEAK. ENGINE SHUTDOWN AND PROPELLER FEATHER WERE ACCOMPLISHED BUT ALTITUDE COULD NOT BE MAINTAINED. A FORCED LANDING WAS PERFORMED IN AN OPEN FIELD. AN 'O' RING FAILURE WAS FOUND ON THE LEFT ENGINE.
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: multi-engine land; single-engine land
- Flight time: 748 hours in all; 400 in this make and model; 27 in the last 90 days
- Medical certificate: Class 3 (valid medical--w/ waivers/lim.)
- Seat: left
The aircraft
- Airframe total time: 1,158 hours
- Last inspection: inspection type not recorded, May 30, 1984; 17 hours since
- Maximum gross weight: 5,300 lb
- Seats: 6
- Landing gear: retractable
- Engine: Continental IO-470-VO (piston); 0 hours total
The flight
- Departed from: Pincher Creek at 10:20 am
- Destination: MDT Minot SD
- Flight plan: VFR
- Runway 0
Weather at the time
- Light: daylight
- Wind: from 100° at 15 knots
- Visibility: 25 statute miles
- Sky: scat
- Temperature: 81°F (27°C), dew point 0°F (-18°C)
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Crew | 1 | |||
| Passengers | 6 |
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.