Ayres Corporation S-2R accident near Beaver, Utah, May 31, 2004
On May 31, 2004 at about 6:15 pm local time, a Ayres Corporation S-2R, registered N5686X, was substantially damaged in an accident near Beaver, Utah. It was an aerial application (crop spraying) flight under agricultural flying rules (Part 137). 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 in-flight failure of the engine's P3 tube which resulted in the loss of engine power and the subsequent impact with terrain during a forced landing. Contributing factors include the lack of suitable terrain for a forced landing and the fence.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- May 31, 2004 · about 6:15 pm local time
- Place
- Beaver, Utah · map
- Type
- Accident
- Injuries
- No one was hurt; 1 person was on board or involved.
- Weather
- visual conditions (good weather)
- Aircraft
- Ayres Corporation S-2R · all S-2Rs on the register
- Registration
- N5686X · registry record · serial 2359R
- Damage
- Substantial damage
- Flight
- Aerial application (crop spraying) flight · agricultural flying rules (Part 137)
The NTSB's narrative final · quoted from the NTSB record
According to the pilot, he had finished spraying a field and was returning to the airport for another load. He said that he had half a tank of fuel remaining and the engine was producing "excellent power." A few moments later, the engine ran rough for about a second and then stopped. He did not notice anything coming out of the exhaust. The pilot tried twice to restart the engine but was unsuccessful and he attempted a forced landing to an open field. During the landing, the airplane impacted terrain and struck a fence. Both wings were displaced aft and the right main landing gear was collapsed. A visual examination of the engine revealed a 360 degree crack around the P3 air pressure tube, causing a separation of the tube between the engine plenum and fuel control unit. The crack was approximately one-quarter inch aft of the "B" nut, which connects the P3 air pressure tube to the fuel control unit. There was a "notable" amount of carbon build-up in the area around the crack. According to a maintenance representative, failure of the tube in flight would have resulted in a "significant reduction in fuel scheduling which could result in an engine flameout." An attempt to restart the engine in flight would "likely have failed," however; an attempt would have accounted for the "notable" amount of carbon build-up around the break in the tube. No other aircraft anomalies were noted.
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
- Ratings: multi-engine land; single-engine land; instrument: airplane
- Flight time: 7,150 hours in all; 2,625 in this make and model
- Last flight review: May 18, 2004
- Medical certificate: Class 2 (valid medical--no waivers/lim.)
- Seat: ctr
- Injury: no injuries
The aircraft
- Last inspection: annual inspection; 33 hours since
- Maximum gross weight: 6,000 lb
- Seats: 1
- Landing gear: fixed
- Engine: Garrett 331-1 (turboprop); 0 hours total
The flight
- Departed from: U52 Beaver UT at 5:20 pm
- Destination: U52 Beaver UT
- Flight plan: none
Weather at the time
- Light: daylight
- Wind: from 210° at 7 knots
- Visibility: 10 statute miles
- Sky: clear
- Temperature: 75°F (24°C), dew point 27°F (-3°C)
- Altimeter: 30.07 inHg
- Observation at 6:54 pm from KMLF, 19 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.
Other NTSB records under N5686X the same tail number, which may have belonged to a different aircraft at the time
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.