Bad Yokes

During a scheduled inspection, technicians encountered corroded and bent control yoke boss attachment hardware that proved difficult to remove. After consulting with the manufacturer, the final recommendation was to remove the boss via cutting the bolts (p/n 2315152-33). Manufacturer was able to repair the yoke assembly using SB 31-27-11 and kit 2381602-801. Aircraft had been parked outside without gust locks.

Key Takeaways:

• Numerous aircraft incidents involve the failure of various "yoke" components, including control yokes, nose landing gear (NLG), main landing gear (MLG), and ski yokes.
• Corrosion is a predominant cause of these failures, often originating internally or exacerbated by environmental exposure, leading to structural degradation and component fracture.
• Other contributing factors include material fatigue, existing cracks, weld failures, and the non-accomplishment of manufacturer service bulletins or inadequate protection from elements.

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