Rockwell 112TC accident near Winner, South Dakota, August 7, 1992
On August 7, 1992 at about 6:50 pm local time, a Rockwell 112TC, registered N30MT, was substantially damaged in an accident near Winner, South Dakota (Bob Wiley Field). It was a personal flight under general aviation rules (Part 91). 3 people had minor injuries. The weather was visual conditions (good weather).
The NTSB's probable cause their words, unchanged
FAILURE OF THE CARBURETOR MIXTURE CONTROL, RESULTING IN LOSS OF ENGINE POWER. A FACTOR RELATED TO THE ACCIDENT WAS: LACK OF COMPLIANCE WITH MARVEL-SCHEBLER SERVICE BULLETIN (SB) #A1-78.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- August 7, 1992 · about 6:50 pm local time
- Place
- Winner, South Dakota · Bob Wiley Field · map
- Type
- Accident
- Injuries
- 3 people had minor injuries.
- Weather
- visual conditions (good weather)
- Aircraft
- Rockwell 112TC
- Registration
- N30MT · registry record · serial 13021
- Damage
- Substantial damage
- Flight
- Personal flight · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
DRG A LNDG GO-AROUND, THE ENG BGN RUNNING ROUGH, THEN LOST PWR. AN ATTEMPT WAS MADE TO MAKE AN EMERG LNDG ON A ROAD ADJACENT TO THE ARPT, BUT THE ACFT HIT A FENCE & AN EMBANKMENT BEFORE REACHING IT. AN INV REVEALED THE LOSS OF POWER WAS DUE TO A MALFUNCTION OF THE ENG'S MARVEL-SCHEBLER MODEL HA-6 CARBURETOR (CARB). EXCESSIVE WEAR OF THE SHAFT RETAINING SCREW ALLOWED MISPOSITIONING OF THE CARB'S ROTARY MIXTURE CONTROL (PN 242-541) AND BLOCKAGE OF FUEL FLOW. IN SEP 78, MARVEL-SCHEBLER/TILLOTSON (ORIGINAL MANUFACTURER OF THE CARB) ISSUED SVC BULLETIN (SB) #A1-78, BUT IT HAD NOT BEEN ACCOMPLISHED. THE SB PROVIDES FOR INSTLN OF A SPRING RETAINER (PN 55-A239) TO COUNTERACT END-PLAY WEAR ON THE MIXTURE CONTROL ASSEMBLY & RETAINING SCREW DUE TO VIBRATION. THE SPRING RETAINER ALSO SERVES AS AN ADNL MEANS OF RETAINING THE ROTARY MIXTURE CONTROL, EVEN IF THE EXISTING SHAFT RETAINING SCREW IS WORN OR BKN. THE ENG HAD A TOTAL FLT TIME OF 1065 HRS & 27 HRS SINCE THE LAST INSPN.
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: commercial pilot
- Ratings: multi-engine land; single-engine land; single-engine sea; instrument: airplane
- Flight time: 3,181 hours in all; 715 in this make and model; 42 in the last 90 days; 34 in the last 30 days; 3,053 as pilot in command
- Medical certificate: Class 3 (valid medical--w/ waivers/lim.)
- Seat: left
The aircraft
- Airframe total time: 1,065 hours
- Last inspection: annual inspection, June 1, 1992; 27 hours since
- Maximum gross weight: 2,800 lb
- Seats: 4
- Landing gear: retractable
- Engine: Lycoming IO-360 (piston); 0 hours total
The flight
- Departed from: BIE Beatrice NE at 4:20 pm
- Destination: SD39 Winner SD
- Flight plan: IFR
- Runway 13, 3,900 ft by 75 ft
Weather at the time
- Light: daylight
- Wind: from 240° at 4 knots
- Visibility: 20 statute miles
- Sky: broken clouds at 2,000 ft; not recorded
- Temperature: 75°F (24°C), dew point 70°F (21°C)
- Altimeter: 29.00 inHg
- Observation at 6:46 pm from PIR, 63 miles away
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Crew | 1 | |||
| Passengers | 2 |
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.