Test TST-10 M accident near Enumclaw, Washington, June 21, 2004
On June 21, 2004, a Test TST-10 M (glider), registered N410JP, was substantially damaged in an accident near Enumclaw, Washington (Bergseth Field). 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
Aircraft control not maintained while maneuvering for landing. A proper glidepath was not maintained was a factor.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- June 21, 2004
- Place
- Enumclaw, Washington · Bergseth Field · map
- Type
- Accident
- Injuries
- 1 person was killed.
- Weather
- visual conditions (good weather)
- Aircraft
- Test TST-10 M
- Registration
- N410JP · registry record · serial 10010503
- Damage
- Substantial damage
- Flight
- Personal flight · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
The accident aircraft departed the airport under power approximately 3 hours prior to the accident. Shortly after returning to the traffic pattern for landing, witnesses observed the aircraft enter a downwind for landing to the east. A witness reported that the pilot's downwind leg appeared normal, however, the base leg to final turn was close to the runway end resulting in a higher than normal glide path to final. Shortly after crossing the landing threshold, the glider pitched up, in conjunction with the speed brakes retracting, and the pilot initiated a turn to the right (south). The pilot rolled to a wings level attitude momentarily before entering a turn to the left. As the aircraft turned to the left, it pitched to a nose-low attitude and impacted terrain. The accident flight was the pilot's first solo landing approach to the accident airport.
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: rotorcraft: glider
- Flight time: 104 hours in all
- Last flight review: February 7, 2004
- Medical certificate: None
- Seat: frt
- Injury: fatal
The aircraft
- Last inspection: inspection type not recorded
- Maximum gross weight: 661 lb
- Seats: 1
- Landing gear: fixed
- Engine: Rotax 447 (piston); 0 hours total
The flight
- Departed from: WN76 Enumclaw WA at 9:30 pm
- Destination: WN76 Enumclaw WA
- Flight plan: none
- Runway 10, 2,100 ft by 60 ft
Weather at the time
- Light: daylight
- Wind: from 342° at 9 knots
- Visibility: 10 statute miles
- Sky: clear
- Temperature: 88°F (31°C), dew point 37°F (3°C)
- Altimeter: 30.02 inHg
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.