Cessna 300/400 Series Corroded Trim Tab Screws A repair station states it has begun removing the four screws attaching the elevator trim tab horn to the trim tab to inspect them for corrosion at every annual inspection performed on 300/400 series Cessnas. The facility reports finding numerous screws corroded almost in half; there is no way to inspect these screws (p/n AN515-8R26 and MS35206-251) without removing them. Part Total Time: (unknown). Diamond DA20-A1 Backwards ELT Installation A repair station technician reports finding an ELT (p/n EBC-0502) installed backwards when removing it from the aircraft for replacement: The direction of flight arrow was pointing aft. This particular installation is located in the baggage compartment-a pilot can slide it out of its mount and reinstall it backwards. Part Total Time: (unknown). Piper PA23-160 Failed Main Gear Drag Link 288
Corrosion And Chafing
A repair station states it has begun removing the four screws attaching the elevator trim tab horn to the trim tab to inspect them for corrosion at every annual inspection performed on 300/400 series Cessnas. The facility reports finding numerous screws corroded almost in half; there is no way to inspect these screws (p/n AN515-8R26 and MS35206-251) without removing them.
Key Takeaways:
- Critical structural components on several aircraft types, including Cessna 300/400 series trim tab screws, Piper PA23-160 main gear drag links, and Piper PA28R-201 engine mounts, are failing due to severe corrosion, fatigue, or damage.
- An Emergency Locator Transmitter (ELT) in a Diamond DA20-A1 was found installed backwards, indicating a potential for user error due to its accessible mounting in the baggage compartment.
- A hydraulic leak in a Piper PA31T was caused by a chafed line in an area not typically included in routine inspections, highlighting the need for revised maintenance protocols for hidden components.
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