Boeing A75N1 Stearman Broken Engine Mount Bolts Inspection of a recent engine installation uncovered a fractured engine-mount bolt. After informing the STC holder of the failure, we were told we should have re-torqued these bolts after 25 hours of operation. This information was not included in the STC. The submitter believes the STC is inadequate in ensuring continued airworthiness. Part Total Time: 100.0 hours. Cessna 170B Failed Tailwheel Assembly During an annual inspection, all parts inside the tailwheel unit were found extremely worn. Additionally, the tailwheel axle had been damaged and its end was partially ground off, 288
Untorqued, Delaminated
Inspection of a recent engine installation uncovered a fractured engine-mount bolt. After informing the STC holder of the failure, we were told we should have re-torqued these bolts after 25 hours of operation. This information was not included in the STC. The submitter believes the STC is inadequate in ensuring continued airworthiness.
Key Takeaways:
- Multiple aircraft types are experiencing various component failures, including fractured engine mount bolts, severely worn tailwheel assemblies, recurrently cracked battery mount structures, and empennage damage.
- Specific issues range from inadequate STC instructions (Stearman engine mounts) and potential design flaws leading to recurrent cracking (Cessna 182S battery mounts) or stripped threads (Diamond DA40 alternate air valves).
- Operational factors, such as extreme braking leading to "gear walk" in Cessna Corvalis models, are also contributing to structural damage.
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