ASN Wikibase Occurrence # 34788
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| Date: | Sunday 30 June 1991 |
| Time: | 09:11 LT |
| Type: |  Beechcraft 65 Queen Air |
| Owner/operator: | Stahl, Richard E. |
| Registration: | N713JB |
| MSN: | LC-35 |
| Year of manufacture: | 1960 |
| Total airframe hrs: | 4958 hours |
| Engine model: | Lycoming IGSO-480-A16A |
| Fatalities: | Fatalities: 6 / Occupants: 6 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Pioneer, CA -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Modesto, CA (KMOD) |
| S Lake Tahoe, CA (KTVL) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
A BEECH 65 COLLIDED WITH TREES IN MOUNTAINOUS TERRAIN AFTER AN INFLT LOSS OF CONTROL. A PILOT OBSERVED THE AIRPLANE START A TURN TO THE RIGHT, ROLL RIGHT AND CONTINUED UNTIL INVERTED AND ENTER INTO A SPIN. THE ACFT WAS IN A STEEP NOSE DOWN ATTITUDE WHEN IT BEGAN ITS PULL; OUT. THE ENGINES WERE HEARD BY A GROUND WITNESS WHO INITIALLY MISTOOK THEM FOR AN APPROACH MOTORCYCLE. THE PILOT INITIALLY FLEW THE ACFT 45 DAYS BEFORE THE ACCIDENT AND LOGGED 3.5 DUAL INSTRUCTION HOURS. THERE WAS NO RECORD IN THE PILOT'S LOGBOOK OF ANY ADDITIONAL FLT TRNG SINCE THE INITIAL FLT. THE PLT SATISFACTORILY COMPLETED A BFR IN A CESSNA 150 FOUR DAYS BEFORE THE ACCIDENT. EXAM OF THE WRECKAGE DSCLSD THE RT ENG HAD BROKEN EXHAUST VALVE, BUT THE LEFT PROP WAS FEATHERED. THERE WERE NO PREEXISTING MECH MALFUNCTIONS OR FAILURES FOUND WITH THE LEFT ENG.
Probable Cause: IMPROPER EMERGENCY PROCEDURES BY THE PILOT, WHEN HE INADVERTENTLY SHUT DOWN THE LEFT ENGINE AFTER ENCOUNTERING A PARTIAL LOSS OF POWER IN THE RIGHT ENGINE. FACTORS RELATED TO THE ACCIDENT WERE: IMPROPER INSTALLATION OF THE RIGHT ENGINE'S #6 EXHAUST VALVE SEAT BY OTHER MAINTENANCE PERSONNEL, FATIGUE FAILURE OF THE #6 EXHAUST VALVE, AND THE PILOT'S LACK OF FAMILIARITY WITH THE AIRCRAFT.
Accident investigation:
 |
|
Sources:
NTSB LAX91FA282
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 06-Feb-2015 18:20 | wf | Updated [Operator, Source] |
| 11-Apr-2024 14:24 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Phase, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
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