Amateur-built TERATORN TIERRA II accident near Morgan, Utah, May 5, 1991
On May 5, 1991 at about 6:50 pm local time, a amateur-built TERATORN TIERRA II (ultralight), registered N134TA, was destroyed in an accident near Morgan, Utah (Morgan County airport). It was a personal flight under general aviation rules (Part 91). 1 person was seriously injured. The weather was visual conditions (good weather).
The NTSB's probable cause their words, unchanged
THE INADVERTANT STALL AND THE PILOT'S STEEP BANKED TURN. FACTORS RELATING TO THE ACCIDENT WERE THE PILOT'S LACK OF QUALIFICATION TO CONDUCT THE FLIGHT AND THE STRONG TAILWIND CONDITIONS.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- May 5, 1991 · about 6:50 pm local time
- Place
- Morgan, Utah · Morgan County · map
- Type
- Accident
- Injuries
- 1 person was seriously injured.
- Weather
- visual conditions (good weather)
- Aircraft
- Amateur-built TERATORN TIERRA II TERATORN T
- Registration
- N134TA · registry record · serial 9473
- Damage
- Destroyed
- Flight
- Personal flight · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
THE ACFT LIFTED OFF AFTER A SHORT TAKEOFF ROLL, CLIMBED TO ABOUT 200 FT AGL, AND THE PILOT INITIATED A STEEP DOWNWIND TURN IN STRONG WIND CONDITIONS. THE ACFT STALLED, DESCENDED NOSE DOWN, AND IMPACTED TERRAIN. THE PILOT HELD AN EXPIRED STUDENT PILOT CERTIFICATE.
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
- Medical certificate: Class 3 (expired)
- Seat: unk
The aircraft
- Airframe total time: 135 hours
- Last inspection: annual inspection, September 5, 1986; 72 hours since
- Maximum gross weight: 600 lb
- Seats: 2
- Landing gear: fixed
- Engine: Rotax 532 (piston); 0 hours total
The flight
- Departed from: 42U Morgan UT at 6:50 pm
- Flight plan: none
- Runway 0
Weather at the time
- Light: daylight
- Visibility: 15 statute miles
- Sky: clear
- Temperature: 64°F (18°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.
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.