ASN Wikibase Occurrence # 227021
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| Date: | Tuesday 9 July 2019 |
| Time: | 12:20 LT |
| Type: |  Stinson 108-3 |
| Owner/operator: | Private |
| Registration: | N6642M |
| MSN: | 108-4642 |
| Year of manufacture: | 1948 |
| Engine model: | Franklin 6A4165 SERIES |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | near Crater Lake Klamath Regional Airport (KLMT/LMT), OR -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Klamath Falls-Kingsley Field, OR (LMT/KLMT) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot had departed on a cross-country flight. About 1,000 ft above ground level, the engine lost partial power. The pilot made a forced landing in an open field, during which the left wing sustained substantial damage as it contacted the ground.
The airplane had a recurring engine performance deficiency that the pilot was aware of, and he used a temporary fix to work around the issue. The mechanic who performed maintenance on the engine before the accident thought that the issue involved the carburetor. Postaccident examination of the carburetor revealed no malfunctions that would have precluded normal operation.
Postaccident examination of the engine revealed multiple incorrectly set valve clearances and multiple cylinders with lower-than-acceptable compression. Thus, the mechanic who performed maintenance on the engine failed to identify the engine's out-of-adjustment valves or the low-cylinder compression.
Probable Cause: The mechanic's failure to identify an engine performance issue, which led to a partial loss of engine power. Contributing to the accident was the pilot's decision to operate the airplane with a known mechanical deficiency.
Accident investigation:
 |
|
Sources:
NTSB WPR19LA207
FAA register: https://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=N6642M
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 10-Jul-2019 23:48 | Captain Adam | Added |
| 11-Jul-2019 03:34 | Geno | Updated [Registration, Source] |
| 02-Jul-2022 07:23 | ASN Update Bot | Updated [Time, Other fatalities, Departure airport, Source, Damage, Narrative, Category, Accident report] |
Corrections or additions? ... Edit this accident description
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