ASN Wikibase Occurrence # 44279
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| Date: | Wednesday 9 November 2005 |
| Time: | 18:34 |
| Type: |  Beechcraft F33A Bonanza |
| Owner/operator: | Private |
| Registration: | N9204Q |
| MSN: | CE-341 |
| Year of manufacture: | 1971 |
| Total airframe hrs: | 3810 hours |
| Engine model: | Teledyne Continental TSIO-520-BB |
| Fatalities: | Fatalities: 1 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Geyserville, CA -
 United States of America
|
| Phase: | Approach |
| Nature: | Executive |
| Departure airport: | Redding, CA (O85) |
| Santa Rosa, CA (STS) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
After visually identifying his home base airport on a night VFR approach, the pilot initiated a descent and the airplane struck the top of a ridgeline at the 2,834-foot level. The pilot was en route home from a trip between two airports that he made often. He had been receiving VFR flight following services from ARTCC and had cancelled when he reported the airport in sight. Recorded radar data showed the airplane descending from its cruise altitude in a straight line toward the airport and the accident site. Investigators identified two marks along the ridgeline that were similar in dimension to the distance between the main landing gear on the airplane. The airframe and engine examinations revealed no preimpact anomalies that would have precluded normal operation. Two drug substances were found in toxicological tests of the pilot's specimens, Diphenhydramine and Cetirizine. Diphenhydramine was found at a level that indicates usage within the past 8 hours of the accident flight. The Cetirizine that was found in the urine, but not the blood, and indicated that the pilot more than likely ingested the drug within the previous 48 hours, but not within the previous 12 hours of the accident. Diphenhydramine can result in drowsiness, and has measurable effects on performance of cognitive and motor tasks. Studies have shown that individuals' performance of tasks has been degraded even though they feel normal after ingesting the drug; however, in this case it is unclear the extent to which the pilot may have been sedated and/or impaired. Studies of individuals taking Cetirizine have not found any significant impairment from the medication.
Probable Cause: the pilot's failure to maintain an adequate terrain clearance altitude profile during the descent that resulted in controlled flight into terrain.
Accident investigation:
 |
|
Sources:
NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20051123X01884&key=1
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 28-Oct-2008 00:45 | ASN archive | Added |
| 21-Dec-2016 19:24 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 06-Dec-2017 11:32 | ASN Update Bot | Updated [Operator, Source, Narrative] |
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