Amateur-built TEENIE TWO accident near Chino, California, September 12, 1999
On September 12, 1999, a amateur-built TEENIE TWO, registered N925SG, was destroyed in an accident near Chino, California (Chino airport). It was a personal flight under general aviation rules (Part 91). 1 person had minor injuries. The weather was visual conditions (good weather).
The NTSB's probable cause their words, unchanged
The in-flight separation and loss of the carburetor fuel jet resulting from the pilot's improper installation of the component. Also causal was the pilot's failure to maintain an adequate airspeed margin following the loss of power, which resulted in an inadvertent stall and spiral.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- September 12, 1999
- Place
- Chino, California · Chino · map
- Type
- Accident
- Injuries
- 1 person had minor injuries.
- Weather
- visual conditions (good weather)
- Aircraft
- Amateur-built TEENIE TWO
- Registration
- N925SG · no longer on the register · serial 15-2733
- Damage
- Destroyed
- Flight
- Personal flight · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
While in the traffic pattern after takeoff, the engine lost power, the pilot lost control, and the airplane crashed. The airport control tower operator stated that the pilot radioed that he was unable to climb and wanted to return for landing. After clearing him to land, he observed the airplane entering a tight nose down spiral. The airplane remained in the spiral until it disappeared from his view. The engine had been experiencing overheating and loss of power problems. The pilot had replaced the fixed jet in his single jet carburetor with an adjustable jet just before the accident. The FAA inspector who examined the wreckage noted that the jet was missing from the carburetor. The pilot's student pilot certificate did not show a solo endorsement for this make and model airplane.
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: student
- Flight time: 44 in this make and model
- Medical certificate: Class 3 (valid medical--no waivers/lim.)
- Seat: frt
The aircraft
- Airframe total time: 44 hours
- Last inspection: annual inspection, September 4, 1999; 10 hours since
- Maximum gross weight: 585 lb
- Seats: 1
- Landing gear: fixed
- Engine: Ama/Expr UNK (piston); 0 hours total
The flight
- Departed from: CNO
- Flight plan: none
- Runway 26R, 4,856 ft by 150 ft
Weather at the time
- Light: daylight
- Wind: from 290° at 12 knots
- Visibility: 10 statute miles
- Sky: clear
- Temperature: 81°F (27°C), dew point 54°F (12°C)
- Altimeter: 29.00 inHg
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.