ASN Wikibase Occurrence # 308649
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| Date: | Friday 16 July 2021 |
| Time: | 12:30 LT |
| Type: |  Cessna 172 |
| Owner/operator: | Private |
| Registration: | N7137T |
| MSN: | 46737 |
| Year of manufacture: | 1959 |
| Total airframe hrs: | 4652 hours |
| Engine model: | Continental O-300 D |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Skwentna, Alaska -
 United States of America
|
| Phase: | Take off |
| Nature: | Private |
| Departure airport: | Skwentna, AK |
| Skwentna Intermediate Airport, AK (SKW/PASW) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that during takeoff from an off-airport gravel bar on a river, the airplane experienced a partial loss of engine power. The pilot rejected the takeoff, and the airplane subsequently encountered a 'bump,” which pitched the nose down. The pilot then made a hard right turn to avoid going into the water, and the airplane nosed down and impacted the ground with the left wing, which resulted in substantial damage to the left wing.
Postaccident examination revealed that the No. 2 cylinder would not produce compression. Removal of the No. 2 cylinder revealed damage, including a hole in the piston that was consistent with detonation and/or preignition. The reason for the detonation and/or preignition could not be determined based on the available evidence.
Probable Cause: A partial loss of engine power due to detonation/preignition damage to the No. 2 cylinder. The reason for the detonation/preignition damage could not be determined based on the available evidence.
Accident investigation:
 |
|
Sources:
NTSB ANC21LA061
History of this aircraft
Other occurrences involving this aircraft
| 25 December 1994 | N7137T | Private | 0 | Unalakleet, AK | |
sub |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|
Corrections or additions? ... Edit this accident description
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