ASN Wikibase Occurrence # 43837
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| Date: | Friday 30 March 2007 |
| Time: | 01:44 |
| Type: |  Ryan Navion A |
| Owner/operator: | Private |
| Registration: | N4369K |
| MSN: | NAV-4-1369 |
| Total airframe hrs: | 3693 hours |
| Engine model: | Continental IO-550-G1 |
| Fatalities: | Fatalities: 2 / Occupants: 2 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Los Banos, CA -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Private |
| Departure airport: | Los Banos, CA (LSN) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
Prior to the flight, the pilot and passenger had each consumed at least 8 to 10 beers. The pilot and passenger had departed from a local bar where patrons had overheard discussions between them about doing some "crazy" aerobatics. Recorded radar data was reviewed. During the last 10 minutes of the flight, the pilot performed high angle turns and pitch up maneuvers. During the last 30 seconds of flight, the pitch angle and vertical speed showed an increase to about 20 degrees and 2,500 feet per minute, respectively. The speed profile revealed the flight's speed was mostly in the region between structural cruise limit and never exceed speeds. Examination of the wreckage revealed the airplane experienced an in-flight break-up. All fracture surfaces were consistent with overload separations. Post accident toxicological tests on specimens from the pilot found a blood ethanol level of 222 mg/dL (0.222 percent) and hydrocodone in the blood at a level of 0.02 mg/L.
Probable Cause: the pilot's intentional performance of aerobatic maneuvers that exceeded the design stress limits of the airplane structure. Also causal was the pilot's impairment due to the effects of alcohol consumption. Contributory was the pilot's impairment due to the effects of prescription medication.
Accident investigation:
 |
|
Sources:
NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20070416X00423&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] |
| 04-Dec-2017 18:32 | ASN Update Bot | Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative] |
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