As+ Ltd AC-4 accident near Cedar Fort, Utah, May 16, 1998
On May 16, 1998 at about 8:15 pm local time, a As+ Ltd AC-4 (glider), registered N158R, was destroyed in an accident near Cedar Fort, Utah (Cedar Valley 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
Failure by the pilot to maintain control of the aircraft. A factor was lack of experience in make and model.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- May 16, 1998 · about 8:15 pm local time
- Place
- Cedar Fort, Utah · Cedar Valley · map
- Type
- Accident
- Injuries
- 1 person was seriously injured.
- Weather
- visual conditions (good weather)
- Aircraft
- As+ Ltd AC-4 · all AC-4s on the register
- Registration
- N158R · registry record · serial 27
- Damage
- Destroyed
- Flight
- Personal flight · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
While on down wind in the landing pattern, the aircraft was observed to enter a nose low attitude and impact the ground. Weather at the time was clear skies and calm winds. Examination of the aircraft provided no evidence of preimpact failure or malfunction. The pilot had accumulated 5 hours experience in aircraft make and model.
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; rotorcraft: glider
- Flight time: 455 hours in all; 5 in this make and model
- Medical certificate: Class 3 (valid medical--w/ waivers/lim.)
- Seat: frt
The aircraft
- Last inspection: inspection type not recorded
- Landing gear: fixed
- Engine: (type not recorded); 0 hours total
The flight
- Departed from: UT10 UT at 8:10 pm
- Flight plan: none
- Runway 35, 5,100 ft by 100 ft
Weather at the time
- Light: daylight
- Visibility: 10 statute miles
- Sky: scat at 11,000 ft
- Temperature: 66°F (19°C), dew point 39°F (4°C)
- Altimeter: 29.00 inHg
- Observation at 8:15 pm from PVU, 25 miles away
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.