ASN Wikibase Occurrence # 35499
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| Date: | Sunday 28 July 1991 |
| Time: | 11:50 LT |
| Type: |  Piper PA-28-181 |
| Owner/operator: | West Valley Flying Club Inc. |
| Registration: | N82716 |
| MSN: | 28-8290141 |
| Total airframe hrs: | 5152 hours |
| Engine model: | Lycoming O-360-A4M |
| Fatalities: | Fatalities: 3 / Occupants: 3 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Sonora, CA -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Training |
| Departure airport: | Palo Alto, CA (KPAO) |
| Markleeville, CA (Q82 | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
A CERTIFICATED FLIGHT INSTRUCTOR AND TWO CERTIFICATED PRIVATE PILOTS WERE PARTICIPATING IN A MOUNTAIN FLYING TRAINING SEMINAR AS PART OF A THREE AIRPLANE FLIGHT. THE ACCIDENT AIRPLANE WAS OBSERVED FOLLOWING A HIGHWAY UP A CANYON TOWARDS A 9,600 FOOT MOUNTAIN PASS. THE AIRPLANE WAS OBSERVED ABOUT 200 FEET ABOVE THE GROUND, BELOW SURROUNDING CANYON WALLS. THE TERRAIN RISES RAPIDLY AT THE END OF THE CANYON. THE AIRPLANE WAS OBSERVED TO MAKE A LEFT TURN AWAY FROM HIGH TERRAIN, PULL UP INTO A NOSE HIGH ALTITUDE, AND DESCEND FROM VIEW. THE AIRPLANE WAS FOUND TO HAVE STRUCK A PINE TREE WITH THE RIGHT WINGTIP, STRIKE ANOTHER TREE, AND THEN COLLIDE WITH A LARGE ROCK OUTCROPPING AT ABOUT 9,000 FEET MEAN SEA LEVEL. AN INTENSE POST IMACCT FIRE CONSUMED ALMOST ALL OF THE AIRPLANE WITH THE EXCEPTION OF PORTIONS OF THE LEFT WING AND TAIL. THE DENSITY ALTITUDE WAS ABOUT 12,000 FEET.
Probable Cause: FAILURE OF THE FLIGHT INSTRUCTOR/PILOT-IN-COMMAND TO ADEQUATELY SUPERVISE THE FLIGHT AND TO MAINTAIN ADEQUATE AIRSPEED BY EXCEEDING THE CLIMB PERFORMANCE OF THE AIRPLANE. CONTRIBUTING TO THE ACCIDENT WAS THE PILOT-IN-COMMAND'S INADEQUATE PLANNING AND HIS SELECTION OF AN IMPROPER ALTITUDE FOR FLIGHT INTO RISING TERRAIN DURING HIGH DENSITY ALTITUDE CONDITIONS.
Accident investigation:
 |
|
Sources:
NTSB LAX91FA333
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 21-Dec-2016 19:22 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 11-Apr-2024 13:24 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
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