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:

• Multiple aircraft incidents involved failures or issues with various yoke assemblies, including nose, main, and ski landing gear yokes, as well as control yokes.
• Corrosion was a recurring and significant factor, contributing to structural degradation, fractures, and complete component failures across different aircraft models.
• Failures were discovered during various phases, from pre-flight inspections and taxiing to post-hard-landing assessments, with contributing factors including existing cracks, broken welds, prior damage, environmental exposure, and neglected service bulletins.

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