ASN Wikibase Occurrence # 179734
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| Date: | Sunday 20 September 2015 |
| Time: | 12:10 |
| Type: |  Stinson 108-3 |
| Owner/operator: | Private |
| Registration: | N6066M |
| MSN: | 108-4066 |
| Year of manufacture: | 1947 |
| Engine model: | Franklin 6A4-165-B3 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Knik Glacier/Knik River junction SE of Palmer, AK -
 United States of America
|
| Phase: | Landing |
| Nature: | Private |
| Departure airport: | Birchwood, AK (BCV) |
| Palmer, AK (None) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The private pilot was conducting a personal flight and was on final approach to land at a remote backcountry airstrip. The pilot reported that he applied carburetor heat for the approach and that he observed 60 mph (52.1 knots) on the airspeed indicator. He subsequently “pushed the throttle forward, but the engine sound remained constant.” According to the pilot-rated passenger, as the pilot began to level the wings to align with the runway, the right wing “instantly…dropped to a 45 degree angle.” He then observed the pilot immediately reach for the throttle but saw him inadvertently grab the carburetor heat lever instead. The airplane impacted terrain in a nose-low, right-wing-down attitude and came to rest on a hillside about 100 yards short of the landing area. The airplane sustained substantial damage to both wings and the fuselage. The pilot reported no mechanical malfunctions or failures with the airplane that would have precluded normal operation.
It is likely that, during the final approach, the pilot did not maintain adequate airspeed and exceeded the airplane’s critical angle-of-attack, which resulted in an aerodynamic stall. Although the pilot attempted to add power to recover from the stall, he inadvertently grabbed the carburetor heat lever instead of the throttle.
Probable Cause: The pilot's failure to maintain adequate airspeed and his exceedance of the airplane’s critical angle-of-attack during final approach to landing, which resulted in an aerodynamic stall and impact with terrain.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 21-Sep-2015 01:43 | Geno | Added |
| 21-Sep-2015 19:04 | Geno | Updated [Aircraft type, Registration, Cn, Operator, Phase, Destination airport, Source, Damage, Narrative] |
| 21-Dec-2016 19:30 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 01-Dec-2017 15:25 | ASN Update Bot | Updated [Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative] |
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