ASN Wikibase Occurrence # 177135
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| Date: | Saturday 20 June 2015 |
| Time: | 07:15 |
| Type: |  Bell 47G-5 |
| Owner/operator: | Gomes Farm Air Service Inc |
| Registration: | N4427F |
| MSN: | 7971 |
| Year of manufacture: | 1970 |
| Total airframe hrs: | 8275 hours |
| Engine model: | Lycoming VO 435 B1A |
| Fatalities: | Fatalities: 1 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | West of Salinas Municipal Airport (KSNS), Salinas, California -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Agricultural |
| Departure airport: | Salinas, CA |
| Salinas, CA | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The non-instrument-rated pilot was conducting aerial application flights in the helicopter and had completed several work orders at various locations before the accident flight. Two coworkers refilled the fertilizer tank on the helicopter and saw it depart from the loading area. About the time that the helicopter was expected to return, a thick fog came in, and the visibility dropped to about 15 to 20 ft. When the helicopter did not return, one of the coworkers searched for the helicopter and found the accident site. Examination of the wreckage did not reveal evidence of any pre-impact mechanical failures. It is likely that the pilot lost visual contact with the ground due to the fog and subsequently experienced spatial disorientation and lost control of the helicopter. This pilot had a similar accident in the helicopter about 5 years earlier, which suggests that he had a habit of taking risks with the weather.
Toxicology testing of the pilot was positive for hydrocodone, dihydrocodeine, acetaminophen, and hydromorphone. The hydrocodone level in the pilot's peripheral blood was 0.718 ug/ml, which was more than 10 times the usual upper therapeutic limit of 0.05 ug/ml. Hydrocodone and its metabolites do not undergo significant postmortem redistribution. Therefore, the measured levels of hydrocodone most likely represent the pilot's antemortem levels. If the pilot had been a novice user, this level would likely have been toxic and caused severe symptoms. However, with regular opioid use, brain physiology changes, leading to tolerance for both the desired analgesic effects and the sedative effects. As a result, incremental dosing increases are required to achieve the same effects, and long-term, chronic users may need the drug to feel and act "normally." The levels present in the pilot indicate that he was chronically taking high doses of hydrocodone. It is likely that the pilot was impaired by opioids at the time of the accident.
In the high workload situation of piloting a helicopter in low altitude flight, even a small degree of impairment from the pilot's use of a high-dose of opioid would have contributed to the likelihood of an accident.
Probable Cause: The non-instrument-rated pilot's visual flight rules flight into instrument meteorological conditions, which resulted in his spatial disorientation and loss of helicopter control. Contributing to the accident was the pilot's impairment by high-dose opioid use.
Accident investigation:
 |
|
Sources:
NTSB
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=4427F
History of this aircraft
Other occurrences involving this aircraft
| 3 September 2010 | N4427F | Frank Gomes | 0 | Highway 101 near Salinas, California | |
sub |
| Collision with pole or wires | ||||||
Location
Images:
Photo: NTSB
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 21-Jun-2015 08:29 | gerard57 | Added |
| 22-Jun-2015 00:29 | Geno | Updated [Time, Aircraft type, Registration, Cn, Operator, Location, Departure airport, Destination airport, Source, Narrative] |
| 21-Dec-2016 19:30 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 15-Mar-2018 20:13 | ASN Update Bot | Updated [Departure airport, Destination airport, Source, Narrative] |
| 15-Mar-2018 21:03 | harro | Updated [Source, Narrative, Photo, ] |
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