ASN Wikibase Occurrence # 353346
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| Date: | Saturday 15 May 1999 |
| Time: | 12:30 LT |
| Type: |  Lake LA-4 |
| Owner/operator: | Private |
| Registration: | N152WB |
| MSN: | 268 |
| Total airframe hrs: | 1367 hours |
| Engine model: | Lycoming O-360-A1A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Coeur D'alene, ID -
 United States of America
|
| Phase: | Landing |
| Nature: | Training |
| Departure airport: | (KCOE) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
While landing in variable, shifting winds, both the dual student and the instructor had trouble maintaining directional control of the aircraft. After touchdown, the aircraft started turning toward the right side of the runway, and the instructor could not get it to straighten out using maximum left brake and full left rudder. He therefore added power to get airflow over the rudder to increase its efficiency, but the aircraft continued to turn sharper, eventually departing the right side of the runway and impacting the segmented circle at the base of the wind sock. It was later discovered that an improper repair weld on one of the engine pylon mounting straps had failed from fatigue, allowing the engine pylon to twist out of alignment with the longitudinal axis of the aircraft.
Probable Cause: The fatigue failure of a repair weld on one of the engine pylon mount straps and the resultant reduction in directional control. Factors include an inadequate repair of the strap, variable wind speeds and sudden wind shifts.
Accident investigation:
 |
|
Sources:
NTSB SEA99LA063
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 09-Mar-2024 13:01 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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