Schempp-Hirth Nimbus-4M accident near Ephrata, Washington, May 4, 2008
On May 4, 2008 at about 9:22 pm local time, a Schempp-Hirth Nimbus-4M (glider), registered N747JN, was substantially damaged in an accident during initial climb near Ephrata, Washington (Ephrata Municipal 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
The pilot's inadequate preflight inspection and his failure to connect the left aileron control rod during assembly.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- May 4, 2008 · about 9:22 pm local time
- Place
- Ephrata, Washington · Ephrata Municipal Airport · map
- Type
- Accident
- Injuries
- 1 person was seriously injured.
- Weather
- visual conditions (good weather)
- Aircraft
- Schempp-Hirth Nimbus-4M · all Nimbus-4Ms on the register
- Registration
- N747JN · registry record · serial 14
- Damage
- Substantial damage
- Flight
- Personal flight · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
This was the first flight after removal of the glider from storage and its reassembly. The pilot reported that during takeoff initial climb, the glider started to roll to the left despite his control inputs. He decided to abort the takeoff and land straight ahead while attempting to maintain control of the powered glider. Subsequently, the left wing struck the ground, and the glider began to cartwheel. Examination of the airframe revealed that the left and right wings were structurally damaged and the empennage was partially separated. Examination of the flight control system revealed that the left aileron connecting rod was disconnected at the fuselage/wing quick connection point and was undamaged. The pilot stated that during assembly of the glider prior to the flight, the left aileron control tube was inadvertently not attached, and that he did not verify that all flight controls moved free and correct prior to takeoff.
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
What happened, in order
- Loss of control in flight during initial climb defining event
- Collision with terrain or object (not controlled flight into terrain) during takeoff
The NTSB's findings
- cause Aircraft › Aircraft systems › Flight control system › Aileron control system › Not inspected
- cause Personnel issues › Task performance › Inspection › Preflight inspection › Pilot
- cause Personnel issues › Task performance › Use of equip/info › Aircraft control › Pilot
Pilot
- Certificate: commercial pilot
- Ratings: single-engine land; rotorcraft: glider
- Flight time: 5,000 hours in all; 1,500 in this make and model
- Medical certificate: Class 3
- Seat: ctr
- Injury: serious injuries
The aircraft
- Seats: 1
- Landing gear: fixed
- Engine: Solo 2625-02 (piston); 0 hours total
The flight
- Departed from: KEPH Ephrata WA at 9:22 pm
- Flight plan: none
- Runway 21, 3,467 ft by 150 ft
Weather at the time
- Light: daylight
- Wind: at 4 knots
- Visibility: 10 statute miles
- Sky: clear
- Temperature: 70°F (21°C), dew point 37°F (3°C)
- Altimeter: 30.05 inHg
- Observation at 8:53 pm from KEPH
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Flight 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.