ASN Wikibase Occurrence # 224463
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| Date: | Sunday 28 April 2019 |
| Time: | 12:37 LT |
| Type: |  Boeing-Stearman A75N1 (PT-17) |
| Owner/operator: | Port Townsend Aero Museum |
| Registration: | N68825 |
| MSN: | 75-5708 |
| Year of manufacture: | 1942 |
| Total airframe hrs: | 555 hours |
| Engine model: | Continental W670-6A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Discovery Bay, Jefferson County, WA -
 United States of America
|
| Phase: | Landing |
| Nature: | Private |
| Departure airport: | Port Townsend, WA (0S9) |
| Port Townsend, WA (0S9) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
Shortly after takeoff for a personal flight, about 1,200 ft mean sea level, the pilot observed spraying oil and light oil smoke and detected the smell of oil coupled with an engine vibration. The pilot decided to make a forced landing. The engine vibration increased, and the engine seized before landing. The forced landing resulted in substantial damage to the right wing and fuselage.
Examination of the radial engine revealed a crankshaft failure due to fatigue; beach marks (also known as arrest marks) were observed in the region of the fracture surface. The maintenance records indicated that the last engine overhaul was accomplished about 15 years before the accident. Engine time since major overhaul recorded at the last annual inspection about 9 months before the accident was 143 hours.
Probable Cause: The total loss of engine power due to the fatigue failure of the crankshaft.
Accident investigation:
 |
|
Sources:
NTSB WPR19LA125
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 29-Apr-2019 01:31 | Geno | Added |
| 29-Apr-2019 09:44 | RobertMB | Updated [Aircraft type, Registration, Cn, Location, Source, Narrative] |
| 29-Apr-2019 11:55 | RobertMB | Updated [Source] |
| 02-Jul-2022 09:13 | ASN Update Bot | Updated [Time, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
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