ASN Wikibase Occurrence # 364395
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| Date: | Friday 11 October 1991 |
| Time: | 16:00 LT |
| Type: |  Beechcraft K35 |
| Owner/operator: | Mike Collishaw |
| Registration: | N9559R |
| MSN: | D6125 |
| Total airframe hrs: | 2380 hours |
| Engine model: | CONTINENTAL IO-470C |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Grass Valley, CA -
 United States of America
|
| Phase: | Approach |
| Nature: | Private |
| Departure airport: | San Jose, CA (KRHV) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
IN AN ORAL STATEMENT, THE PILOT SAID THAT AS HE APPROACHED THE AIRPORT HE OBSERVED SQUALL LINE ACTIVITY AND DECIDED TO ORBIT UNTIL THE WEATHER CLEARED. AFTER THE WEATHER CONDITIONS VISUALLY IMPROVED, THE PILOT ENTERED THE PATTERN FOR LANDING. HE STATED THAT ON SHORT FINAL APPROACH THE AIRCRAFT ENCOUNTERED SEVERE TURBULENCE AND A DOWN DRAFT. THE PILOT INITIATED A GO AROUND, HOWEVER, THE AIRCRAFT ROLLED VIOLENTLY AND THE WING TIP STRUCK THE GROUND. AN AIRPORT ATTENDANT STATED THAT HE WAS IN THE OFFICE WHERE THE WEATHER OBSERVATION INSTRUMENTS ARE LOCATED AT THE TIME OF THE ACCIDENT. HE SAID THAT THE WINDS WERE 30 TO 40 KNOTS WITH SUDDEN 180 DEGREE CHANGES IN DIRECTION AT THE TIME THE PILOT ATTEMPTED HIS APPROACH. THUNDERSTORM CLOUDS WERE VISIBLE IN THE DISTANCE AND THE AIRPORT WAS EXPERIENCING INTERMITTENT HEAVY RAIN SHOWERS.
Probable Cause: THE INADVERTENT ENCOUNTER WITH A MICROBURST/DOWNBURST PHENOMENA ASSOCIATED WITH THUNDERSTORM ACTIVITY. A FACTOR IN THE ACCIDENT WAS THE FAILURE OF THE PILOT TO ADEQUATELY ASSESS THE WEATHER CONDITIONS DURING THE LANDING ATTEMPT.
Accident investigation:
 |
|
Sources:
NTSB LAX92LA012
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 19-Mar-2024 14:35 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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