Amateur-built MUSTANG M-II accident near Guthrie, Oklahoma, December 5, 1993
On December 5, 1993 at about 4:40 pm local time, a amateur-built MUSTANG M-II, registered N4YP, was destroyed in an accident near Guthrie, Oklahoma. It was a personal flight under general aviation rules (Part 91). 1 person was killed. The weather was visual conditions (good weather).
The NTSB's probable cause their words, unchanged
WAS THE IN FLIGHT FAILURE OF THE LEFT AILERON FOR REASONS UNDETERMINED.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- December 5, 1993 · about 4:40 pm local time
- Place
- Guthrie, Oklahoma · map
- Type
- Accident
- Injuries
- 1 person was killed.
- Weather
- visual conditions (good weather)
- Aircraft
- Amateur-built MUSTANG M-II MUSTANG M-
- Registration
- N4YP · registry record · serial M-II-301
- Damage
- Destroyed
- Flight
- Personal flight · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
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
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; single-engine sea
- Flight time: 806 hours in all; 269 in this make and model; 34 in the last 90 days; 751 as pilot in command
- Medical certificate: Class 3 (valid medical--w/ waivers/lim.)
- Seat: frt
The aircraft
- Airframe total time: 1,088 hours
- Last inspection: approved inspection programme, June 1, 1993; 77 hours since
- Maximum gross weight: 1,550 lb
- Seats: 1
- Landing gear: fixed
- Engine: Lycoming O-360-A1A (piston); 0 hours total
The flight
- Departed from: 2DT Oklahoma City OK at 3:30 pm
- Flight plan: none
- Runway 0
Weather at the time
- Light: daylight
- Wind: from 360° at 17 knots, gusting 26
- Visibility: 15 statute miles
- Sky: scat at 25,000 ft
- Temperature: 54°F (12°C), dew point 27°F (-3°C)
- Altimeter: 29.00 inHg
- Observation at 4:48 pm from PWA, 17 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.