ASN Wikibase Occurrence # 244300
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| Date: | Wednesday 21 October 2020 |
| Time: | 11:17 LT |
| Type: |  Piper PA-28-180 Cherokee |
| Owner/operator: | Avra Valley Flyers LLC |
| Registration: | N7405W |
| MSN: | 28-1291 |
| Year of manufacture: | 1963 |
| Total airframe hrs: | 4551 hours |
| Engine model: | Lycoming O-360 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | SW ofShow Low Regional Airport (SOW/KSOW), Show Low, AZ -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Marana Regional Airport, AZ (AVW/KAVQ) |
| Show Low, AZ | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that, while in cruise flight about 8,000 ft mean sea level, there was a loud bang followed by severe engine vibration and the engine lost partial power. The pilot attempted to troubleshoot; however, the engine continued to produce less than full power. The pilot declared an emergency and performed a forced landing to a highway, during which the airplane's right wing impacted a barbed wire fence, resulting in substantial damage.
Examination of the engine revealed a stuck exhaust valve on the No. 4 cylinder. The exhaust valve head had separated from the valve stem. The loose valve head was found in the cylinder's combustion chamber; the combustion chamber and piston dome exhibited damage consistent with repeated contact with the valve head. The loss of engine power is consistent with the failure of the No. 4 cylinder exhaust valve; however, the reason for the valve failure could not be determined based on the available information.
Probable Cause: A partial loss of engine power due to the failure of the No. 4 cylinder exhaust valve.
Accident investigation:
 |
|
Sources:
NTSB WPR21LA020
FAA register: https://registry.faa.gov/aircraftinquiry/Search/NNumberResult
https://flightaware.com/live/flight/N7405W
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 22-Oct-2020 17:55 | Geno | Added |
| 24-Oct-2020 06:42 | Anon. | Updated [Damage, Narrative] |
Corrections or additions? ... Edit this accident description
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