ASN Wikibase Occurrence # 150844
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| Date: | Friday 23 November 2012 |
| Time: | 15:30 |
| Type: |  Taylor Coot A |
| Owner/operator: | Private |
| Registration: | N8VS |
| MSN: | Sater Coot #1 |
| Engine model: | Franklin 6A&6V335 |
| Fatalities: | Fatalities: 1 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | South of Calaveras County Airport - KCPU, San Andreas, CA -
 United States of America
|
| Phase: | Approach |
| Nature: | Private |
| Departure airport: | San Andreas, CA (CPU) |
| San Andreas, CA (CPU) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
A witness observed the airplane in a steep bank (estimated at between 60 and 80 degrees) while turning from the base leg to final approach in the traffic pattern. He then observed the airplane enter a spin and stated the airplane was in a near vertical nose-down attitude when the right wing separated from the airframe. Another witness reported that after the airplane’s first spin revolution, the leading edge came off of a wing and that during the second spin revolution the other wing separated. A postaccident examination of the airplane revealed that both wings had separated from the airplane about the same spanwise location (about 17 inches outboard of the wing attach points). The right wing’s front spar fracture face showed areas of tension and compression failures of the wood fibers that were consistent with the wing failing in a downward direction. Both the leading edge and front spar of the left wing had diagonal cuts through them that were consistent with having been struck by the airplane’s propeller. The inboard front spar fracture face was examined, but the fiber failures were destroyed by the ground impact, so a directionality of failure could not be determined. However, the propeller strike on the leading edge and front spar could only occur if the left wing failed upward into the propeller. There were no obvious signs of rot or preexisting conditions in the wood spars examined, and none of the wing attachment bolts failed. The witness reports indicating that the airplane was in a continuous steepening turn from the downwind leg to final approach immediately before the accident and the observed damage suggest that the pilot’s control inputs stressed the airplane’s wings beyond their design capabilities.
Probable Cause: The pilot's excessive flight control inputs, which led to flight that exceeded the structural limits of the airplane and resulted in structural failure of both wings.
Accident investigation:
 |
|
Sources:
NTSB
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=8VS&x=0&y=0
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Nov-2012 02:39 | gerard57 | Added |
| 24-Nov-2012 10:29 | Geno | Updated [Time, Aircraft type, Location, Phase, Destination airport, Source, Narrative] |
| 25-Nov-2012 15:03 | Geno | Updated [Source] |
| 26-Nov-2012 10:19 | Geno | Updated [Registration, Cn, Operator, Source] |
| 26-Nov-2012 10:20 | Geno | Updated [Cn, Location] |
| 27-Nov-2012 17:58 | Geno | Updated [Time, Location, Nature, Source, Narrative] |
| 21-Dec-2016 19:28 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 28-Nov-2017 13:54 | ASN Update Bot | Updated [Cn, Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative] |
| 02-Jul-2022 17:16 | rvargast17 | Updated [Source, Damage] |
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