Amateur-built GS-1 accident near Sand Springs, Oklahoma, August 13, 1983
On August 13, 1983 at about 10:30 pm local time, a amateur-built GS-1, registered N111JP, was substantially damaged in an accident near Sand Springs, Oklahoma. It was a personal flight under general aviation rules (Part 91). No one was hurt; 1 person was 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
- August 13, 1983 · about 10:30 pm local time
- Place
- Sand Springs, Oklahoma · map
- Type
- Accident
- Injuries
- No one was hurt; 1 person was on board or involved.
- Weather
- visual conditions (good weather)
- Aircraft
- Amateur-built GS-1
- Registration
- N111JP · no longer on the register · serial 1
- 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 LAKE AFTER MANEUVERING AROUND AT LOW ALT FOR SOME TIME. A LAKE PATROLMAN REPORTED THE ACFT ALT BEFORE THE CRASH AT ABOUT 20 FT AGL. ACCORDING TO THE PLTS STATEMENT HE WAS ABOUT 50 FT HIGH WHEN HE INITIATED A 30 TO 40 DEGREE ANGLE OF BANK AND THE ACFT STALLED AND CRASHED. THE ACFT SANK IN 37 FT OF WATER BUT WAS RECOVERED THE FOLLOWING DAY.
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: single-engine land
- Flight time: 533 hours in all; 31 in this make and model; 476 as pilot in command
- Medical certificate: Class 2 (expired)
- Seat: frt
The aircraft
- Last inspection: inspection type not recorded
- Maximum gross weight: 900 lb
- Seats: 1
- Landing gear: fixed
- Engine: Continental A-65 (piston); 0 hours total
The flight
- Departed from: OF8 Sand Springs OK at 10:00 pm
- Flight plan: none
- Runway 0
Weather at the time
- Light: daylight
- Wind: from 180° at 7 knots
- Visibility: 8 statute miles
- Sky: clear
- Temperature: 100°F (38°C), dew point 0°F (-18°C)
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.
Other NTSB records under N111JP the same tail number, which may have belonged to a different aircraft at the time
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.