Cessna 140 accident near Spearfish, South Dakota, August 25, 2012
On August 25, 2012 at about 5:00 pm local time, a Cessna 140, registered N140XX, was substantially damaged in an accident during approach near Spearfish, South Dakota (Black Hills Airport-Clyde Ice). 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 partial loss of engine power due to debris lodged beneath the throttle body of the carburetor venturi.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- August 25, 2012 · about 5:00 pm local time
- Place
- Spearfish, South Dakota · Black Hills Airport-Clyde Ice · map
- Type
- Accident
- Injuries
- No one was hurt; 1 person was on board or involved.
- Weather
- visual conditions (good weather)
- Aircraft
- Cessna 140 · all 140s on the register
- Registration
- N140XX · no longer on the register · serial 8847
- Damage
- Substantial damage
- Flight
- Personal flight · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
After an uneventful cross-country flight, the solo student pilot was setting up to enter the downwind leg of the traffic pattern at his destination airport. When he applied carburetor heat, the engine rpm dropped below 1000. Unable to continue to the planned runway, the student pilot elected to land the airplane in an adjacent field. During the landing roll, the airplane struck a barbed wire fence and nosed over, coming to rest inverted. Postaccident examination of the engine revealed debris lodged in the throttle body beneath the carburetor venturi. The debris appeared to be remnants of aluminum tape or foil. Additionally, what appeared to be a small piece of exhaust insulation or asbestos wrap was found within the carburetor heat box. No other anomalies with the engine or airframe were discovered that could have contributed to the partial loss of engine power. It is unknown how long the foreign object debris was present below the carburetor venturi; however, the airplane had operated for about 3 flight hours since its most recent annual inspection, which was conducted 3 months before the accident flight. The presence of debris lodged beneath the carburetor venturi is consistent with the student pilot's statement that he experienced a loss of power and engine rpm when carburetor heat was applied.
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
What happened, in order
- Loss of engine power (partial) during approach defining event
- Off-field or emergency landing during emergency descent
- Nose over/nose down during landing (landing roll)
The NTSB's findings
- cause Aircraft › Aircraft power plant › Engine fuel and control › Fuel control/carburetor › Not specified
Pilot
- Certificate: student
- Flight time: 70 hours in all; 70 in this make and model; 4 in the last 90 days; 20 as pilot in command
- Medical certificate: Class 3 (with waivers/limitations)
- Seat: left
- Injury: no injuries
The aircraft
- Airframe total time: 1,476 hours
- Last inspection: annual inspection, May 3, 2012; 1,473 hours since
- Maximum gross weight: 1,450 lb
- Seats: 2
- Landing gear: fixed
- Engine: Cont Motor C85 SERIES (piston); 0 hours total
The flight
- Departed from: PHP Philip SD at 4:00 pm
- Destination: SPF Spearfish SD
- Flight plan: none
Weather at the time
- Light: daylight
- Wind: from 350° at 3 knots
- Visibility: 10 statute miles
- Sky: clear
- Temperature: 64°F (18°C), dew point 37°F (3°C)
- Altimeter: 30.09 inHg
- Observation at 4:35 pm from SPF, 1 miles away
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Flight 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.