Aerospatiale AS350B accident near Camp Verde, Arizona, June 30, 2012
On June 30, 2012 at about 7:07 pm local time, a 1990 Aerospatiale AS350B (helicopter), registered N729DP, was substantially damaged in an accident during maneuvering (low-alt flying) near Camp Verde, Arizona (Scottsdale airport). It was a personal flight under general aviation rules (Part 91). 4 people were killed. The weather was visual conditions (good weather).
The NTSB's probable cause their words, unchanged
The pilot's improper decision to fly at a low altitude through a river canyon, contrary to voluntary guidance within the Special Conservation Area, which led to collision with a cable. Contributing to the pilot’s decision were his cognitive and psychomotor impairment from his use of an antihistamine medication.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- June 30, 2012 · about 7:07 pm local time
- Place
- Camp Verde, Arizona · Scottsdale · map
- Type
- Accident
- Injuries
- 4 people were killed.
- Weather
- visual conditions (good weather)
- Aircraft
- Aerospatiale AS350B, built 1990 · all AS350Bs on the register
- Registration
- N729DP · registry record · serial 2338
- Damage
- Substantial damage
- Flight
- Personal flight · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
The helicopter was reported missing by family members, and the wreckage was found the next day in a deep river canyon abutted by 200-foot vertical cliffs. Before the accident, a U.S. Geological Survey (USGS) cableway system had spanned the river about 300 feet north of the wreckage and had been elevated about 39 feet above the river's center. Examination of the cable, its landing platforms, the helicopter, and the wreckage location revealed evidence consistent with the helicopter impacting the cable while traveling in level-forward flight. A photo of the cableway taken by the USGS before the accident showed that the cable suspended over the river was not visible against the terrain background; however, the cableway did not meet the Federal Aviation Administration (FAA) aerial marker requirement criteria. The USGS has replaced the cableway with aerial markers. In addition, the accident occurred within a designated Special Conservation Area, which the FAA recommends avoiding, if practical, or if flown through, it recommends that pilots should make every effort to fly not less than 2,000 feet above ground level. The pilot's postaccident ethanol levels were indicative of the ethanol being produced postmortem; if any of the ethanol was due to ingestion, it was well below the FAA regulatory limit, and it is unlikely to have contributed to the accident. The pilot's postaccident diphenhydramine level suggests that he had taken it within an hour of taking off. Diphenhydramine causes marked sedation, is a central nervous system depressant, and it has been observed to alter mood and impair cognitive and psychomotor performance. It is likely that diphenhydramine led to cognitive and psychomotor impairment to the pilot and contributed to his decision to fly at an insufficient altitude in a river canyon.
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
- Low altitude operation/event during maneuvering (low-alt flying) defining event
- Collision with terrain or object (not controlled flight into terrain) during maneuvering (low-alt flying)
The NTSB's findings
- cause Personnel issues › Action/decision › Action › Incorrect action selection › Pilot
- cause Personnel issues › Action/decision › Info processing/decision › Decision making/judgment › Pilot
- cause Aircraft › Aircraft oper/perf/capability › Performance/control parameters › Altitude › Not attained/maintained
- factor Personnel issues › Physical › Impairment/incapacitation › OTC medication › Pilot
- Environmental issues › Physical environment › Object/animal/substance › Wire › Contributed to outcome
- Personnel issues › Experience/knowledge › Knowledge › Knowledge of regulatory reqs › Pilot
Pilot
- Certificate: private
- Ratings: multi-engine land; single-engine land; instrument: airplane; rotorcraft: helicopter
- Flight time: 4,500 hours in all; 417 in this make and model; 0 in the last 90 days; 0 in the last 30 days
- Medical certificate: Class 3 (with waivers/limitations)
- Seat: rgt
- Injury: fatal
The aircraft
- Airframe total time: 7,359 hours
- Last inspection: annual inspection, February 10, 2012
- Maximum gross weight: 4,960 lb
- Seats: 6
- Landing gear: fixed
- Engine: Turbomeca ARRIEL 1B (turboshaft); 10,658 hours total
- Operator: Chopper II LLC
The flight
- Departed from: KSDL Scottsdale AZ at 3:25 pm
- Destination: KSDL Scottsdale AZ
- Flight plan: none
Weather at the time
- Light: daylight
- Wind: from 240° at 8 knots
- Visibility: 10 statute miles
- Sky: clear
- Temperature: 95°F (35°C), dew point 34°F (1°C)
- Altimeter: 30.09 inHg
- Observation at 7:15 pm from KSEZ, 23 miles away
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Flight crew | 1 | |||
| Passengers | 3 |
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.