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 models reported critical component failures, including fractured engine-mount bolts, extensively worn tailwheel assemblies, and recurring structural cracks in battery mounts.
- These incidents highlight issues with inadequate maintenance documentation (e.g., missing re-torque instructions in an STC) and potential design flaws leading to repeated part failures even after replacement.
- Other widespread problems included empennage damage from extreme braking maneuvers in Cessna Corvalis aircraft and a fleet-wide issue of loose alternate air control cables in Diamond DA40s due to stripped threads.
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