ASN Wikibase Occurrence # 42472
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| Date: | Thursday 18 February 1993 |
| Time: | 12:05 LT |
| Type: |  Quad City Challenger II |
| Owner/operator: | Frank D. Graham |
| Registration: | N4391V |
| MSN: | 20192CW0785 |
| Total airframe hrs: | 56 hours |
| Engine model: | HIRTH 2703 |
| Fatalities: | Fatalities: 1 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Boulder City, NV -
 United States of America
|
| Phase: | Unknown |
| Nature: | Private |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE PILOT HAD CALLED ANOTHER PILOT ON THE RADIO AND SAID THAT HE WAS 5 MI SOUTH OF THE AIRPORT AND RETURNING TO LAND. WHEN THE PILOT DID NOT RETURN, THE OTHER PILOT TOOK OFF TO SEARCH FOR THE PILOT. THE AIRPLANE WAS LOCATED 3 MI SOUTH OF THE AIRPORT. EXAMINATION OF THE AIRPLANE REVEALED THE AIRPLANE IMPACTED THE TERRAIN NOSE FIRST AT A 40-45 DEG ANGLE. THE PROPELLER APPEARED NOT TO HAVE BEEN TURNING AT IMPACT. AN EXAM OF THE ENGINE FOUND NO MECHANICAL DISCREPANCIES. TOXICOLOGICAL RESULTS WERE POSITIVE: BLOOD SCREEN - 1026 NG/ML DIAZEPAM, 1142 NG/ML NORDIAZEPAM; URINE SCREEN - METHAMPHETAMINE, AMPHETAMINE, OXAZEPAM, TEMAZEPAM, AND NORDIAZEPAM IDENTIFIED. THE LEVEL OF DIAZEPAM WOULD INDICATE THAT THE PILOT WAS TAKING THE TRANQUILIZER VALIUM AT A LEVEL OF AT LEAST TWICE THE NORMAL THERAPEUTIC CONCENTRATION. IN ADDITION, THE AUTOPSY REVEALED A SEVERE OCCLUSION OF THE LEFT ANTERIOR DESCENDING ARTERY, AT ITS ORIGIN. THE DEGREE OF OCCLUSION WAS SUFFICIENT TO HAVE CAUSED ARRHYTHMIA, INFARCT OR EVEN DEATH AT ANY TIME.
Probable Cause: THE PILOT'S LOSS OF AIRPLANE CONTROL DUE TO PHYSICAL IMPAIRMENT AS A RESULT OF EITHER DRUGS OR OTHER CARDIOVASCULAR REASONS, OR BOTH.
Accident investigation:
 |
|
Sources:
NTSB LAX93LA124
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 21-Dec-2016 19:24 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 10-Apr-2024 15:41 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Phase, Source, Narrative, Category, Accident report] |
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