Amateur-built RV-4 accident near Coos Bay, Oregon, July 7, 1999
On July 7, 1999 at about 11:00 pm local time, a amateur-built RV-4, registered N6NW, was substantially damaged in an accident near Coos Bay, Oregon. 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
Inadequate aircraft preflight inspection (engine air inlet cover not removed) by the pilot, resulting in obstruction of the carburetor air inlet in flight and consequent inflight engine stoppage. Factors contributing to the accident included a vehicle entering the attempted forced landing surface, and fence posts in the forced landing area.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- July 7, 1999 · about 11:00 pm local time
- Place
- Coos Bay, Oregon · map
- Type
- Accident
- Injuries
- 1 person was seriously injured.
- Weather
- visual conditions (good weather)
- Aircraft
- Amateur-built RV-4
- Registration
- N6NW · no longer on the register · serial 1
- Damage
- Substantial damage
- Flight
- Personal flight · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
The pilot reported that after takeoff, at an altitude of approximately 600 feet above ground level (AGL), the engine suddenly stopped. Attempts to restart the engine were unsuccessful, and the pilot attempted a forced landing onto a road. As the aircraft approached the road at about 300 feet AGL, a car turned onto the road. It became apparent to the pilot that the aircraft would overtake and hit the car from the rear if he attempted to land on the road, and the pilot thus attempted to turn the airplane to go up a driveway off the road. The airplane subsequently struck fence posts during the forced landing. FAA inspectors who performed a post-accident examination of the aircraft's engine found a 2 1/2 inch diameter soft blue ball, wrapped in Scotch tape and with a flag of red plastic tape attached, lodged in the carburetor air inlet. The inspectors reported that the aircraft owner identified the ball as an improvised engine air inlet cover, which he had placed into the engine air inlet to prevent foreign objects from entering the inlet during ground storage of the aircraft. The FAA inspectors reported finding no other evidence of pre-impact engine mechanical malfunction.
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: flight instructor, commercial pilot
- Ratings: multi-engine land; single-engine land; single-engine sea; instructor: airplane multi-engine; instructor: airplane single-engine; instructor: instrument airplane; instrument: airplane
- Flight time: 10,000 hours in all; 542 in this make and model
- Medical certificate: Class 3 (valid medical--w/ waivers/lim.)
- Seat: frt
The aircraft
- Airframe total time: 540 hours
- Last inspection: annual inspection, July 1, 1999; 2 hours since
- Maximum gross weight: 1,600 lb
- Seats: 2
- Landing gear: fixed
- Engine: Lycoming O-320-E2D (piston); 0 hours total
The flight
- Departed from: OTH North Bend OR at 11:00 pm
- Flight plan: none
- Runway 0
Weather at the time
- Light: daylight
- Wind: from 320° at 13 knots
- Visibility: 10 statute miles
- Sky: clear
- Temperature: 63°F (17°C), dew point 48°F (9°C)
- Altimeter: 30.00 inHg
- Observation at 10:55 pm from OTH
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.