Mitsubishi MU-2B-35 accident near Casper, Wyoming, April 6, 1993
On April 6, 1993 at about 10:35 am local time, a Mitsubishi MU-2B-35, registered N96JP, was destroyed in an accident near Casper, Wyoming (Natrona County Int'L airport). It was a flight of an unrecorded kind under charter and air-taxi rules (Part 135). 4 people were killed. The weather was instrument conditions (cloud, fog or low visibility).
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The NTSB's probable cause their words, unchanged
FAILURE OF THE PILOT TO MAINTAIN PROPER ALTITUDE DURING THE NIGHT IFR APPROACH IN INSTRUMENT METEOROLOGICAL CONDITIONS (IMC).
Source: NTSB aviation accident database, copy made October 4, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- April 6, 1993 · about 10:35 am local time
- Place
- Casper, Wyoming · Natrona County Int'L · map
- Type
- Accident
- Injuries
- 4 people were killed.
- Weather
- instrument conditions (cloud, fog or low visibility)
- Aircraft
- Mitsubishi MU-2B-35 · all MU-2B-35s on the register
- Registration
- N96JP · registry record · serial 556
- Damage
- Destroyed
- Flight
- Flight of an unrecorded kind · charter and air-taxi rules (Part 135)
The NTSB's narrative final · quoted from the NTSB record
THE AIRCRAFT WAS ON AN AIR AMBULANCE (EMS) FLIGHT AND WAS CLEARED FOR THE ILS RUNWAY 8 APPROACH AT CASPER, WY. RADAR DATA SHOWED THE AIRCRAFT TRACKING AND DESCENDING NORMALLY ON THE DME ARC, UNTIL IT WAS BELOW RADAR COVERAGE FOR THE AREA. SUBSEQUENTLY, IT COLLIDED WITH THE TOP OF A RIDGE, ALONG THE LOCALIZER CENTERLINE, BEFORE REACHING THE OUTER MARKER, ABOUT 8 MILES FROM THE AIRPORT. ELEVATION OF THE CRASH SITE WAS ABOUT 5800 FEET; MINIMUM DESCENT ALTITUDE BEFORE INTERCEPTING THE ILS GLIDE SLOPE WAS 7100 FEET; CROSSING ALTITUDE AT THE OUTER MARKER WAS 6700 FEET.
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: airline transport pilot, flight instructor
- Ratings: multi-engine land; single-engine land; instructor: airplane multi-engine; instructor: airplane single-engine; instructor: helicopter; instrument: airplane
- Flight time: 12,360 hours in all; 205 in this make and model; 50 in the last 90 days; 18 in the last 30 days; 12,000 as pilot in command
- Medical certificate: Class 2 (valid medical--no waivers/lim.)
- Seat: left
The aircraft
- Airframe total time: 4,781 hours
- Last inspection: 100-hour inspection, August 12, 1992; 61 hours since
- Maximum gross weight: 10,800 lb
- Seats: 6
- Landing gear: retractable
- Engine: Garrett TPE 331-6-252 (turboprop); 0 hours total
- Fire on the ground
- Operator: Casper Air Service
The flight
- Departed from: RIW Riverton WY at 10:05 am
- Destination: CPR WY
- Flight plan: IFR
- Runway 8, 8,679 ft by 150 ft
Weather at the time
- Light: night, dark
- Wind: from 010° at 12 knots
- Visibility: 0.8 statute miles
- Sky: overcast at 400 ft
- Temperature: 0°F (-18°C), dew point 0°F (-18°C)
- Altimeter: 29.00 inHg
- Observation at 10:06 am from CPR, 8 miles away
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Crew | 3 | |||
| Passengers | 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.
About this page
Everything above comes from the NTSB's public accident database: the narrative, probable cause and findings are the NTSB's own words, and the coded tables behind its report (pilot, aircraft, flight, weather, injuries, sequence of events) are written out in plain English. Pilots' ages, home towns and medical details are left out on purpose. The documents and photographs are the NTSB's docket, the folder of records gathered during the investigation, shown as the NTSB released them (the NTSB redacts some personal details first) and listed under the NTSB's own titles. This site's own text never names pilots, passengers or anyone else involved. A preliminary report describes what is known soon after the event and can change; the final report, with the probable cause, usually follows one to two years later and this page is refreshed when it does. Case number SEA93FA088.