ASN Wikibase Occurrence # 146459
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| Date: | Saturday 23 June 2012 |
| Time: | 15:13 |
| Type: |  Cessna 172 Skyhawk |
| Owner/operator: | Private |
| Registration: | N5781A |
| MSN: | 28381 |
| Year of manufacture: | 1956 |
| Total airframe hrs: | 6162 hours |
| Engine model: | Continental O-300-A |
| Fatalities: | Fatalities: 4 / Occupants: 4 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | South of Suttle Road, Veneta, OR -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Private |
| Departure airport: | Veneta, OR (33OR) |
| Veneta, OR (33OR) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
Local witnesses reported that the airplane took off from the airport; however, shortly after takeoff, the sound of the engine stopped. One witness reported that when he saw the accident airplane fly over 100-foot-tall trees north of him at an altitude of about 200 feet above ground level, the engine sounded normal. However, when he looked away from the airplane momentarily, he heard the engine stop. He immediately looked back and saw the airplane descend into the 100-foot tall trees.
A portable electronic device was located in the wreckage, and it contained a 23-second video that was recorded during the accident flight and ended just before the airplane impacted the trees. Review of the video revealed that it began as the airplane initiated the takeoff roll on the grass runway. The video briefly captured the engine tachometer gauge, which displayed 2,300 rpm. Throughout the video, the engine sound was consistent and did not increase or decrease. During the final 8 seconds of the video, after the airplane became airborne, a sound similar to a stall warning horn began and was heard until the end of the recording. During the last 4 seconds of the video, only the sky and the airplane’s propeller were visible.
Postaccident examination of the airframe and engine and a postaccident engine run revealed no evidence of any preimpact mechanical malfunction or failure that would have precluded normal operation. The throttle control was found in the idle position and was bent downward. Given the idle position of the throttle and downward bend, it is likely that the pilot reduced power before the airplane collided with the trees. The sound of the stall warning horn in the video suggests that the airplane was traveling at a slow airspeed immediately after takeoff and most likely continued in this state throughout the climb. Although witnesses reported hearing the engine lose power, it is possible that the witnesses heard the reduction of engine power from a high power setting to an idle power setting before the airplane’s impact with trees and attributed the sound to a loss of engine power.
Toxicology tests on the pilot were found positive for metabolites of marijuana within the pilot’s blood and lung tissue. Most behavioral and physiological effects return to baseline levels within 3-5 hours after drug use, although some residual effects in specific behaviors have been demonstrated up to 24 hours, such as complex divided attention tasks. Psychomotor impairment can persist after the perceived high has dissipated. Although the pilot’s use of marijuana may have affected his ability to successfully manage this flight, use likely occurred more than 5 hours before the accident, and the exact degree of impairments in cognition, judgment, and motor function could not be determined.
Probable Cause: The pilot’s failure to maintain adequate airspeed and altitude to clear trees during the initial climb after takeoff.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Jun-2012 00:43 | gerard57 | Added |
| 24-Jun-2012 00:49 | gerard57 | Updated [Date] |
| 24-Jun-2012 00:57 | gerard57 | Updated [Aircraft type, Source] |
| 24-Jun-2012 05:17 | RobertMB | Updated [Time, Location, Phase, Departure airport, Source, Narrative] |
| 24-Jun-2012 22:05 | Geno | Updated [Registration, Cn, Location, Source, Narrative] |
| 05-Jul-2012 08:12 | Geno | Updated [Time, Source, Narrative] |
| 21-Dec-2016 19:28 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 27-Nov-2017 20:45 | ASN Update Bot | Updated [Other fatalities, Departure airport, Destination airport, Source, Narrative] |
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