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:

• Failures were reported across various aircraft "yoke" assemblies, encompassing nose landing gear, main landing gear, control yokes, and ski yokes.
• Corrosion is a predominant underlying cause, frequently leading to structural degradation such as cracks, fractures, or binding in these critical components.
• Contributing factors include existing component damage, unaccomplished maintenance (e.g., Service Bulletins), and operational stressors like hard landings or improper aircraft storage.

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