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Aftermath: A Pattern of Failure

Gemini Sparkle

Key Takeaways:

  • Between 2006 and 2009, Zodiac CH 601 aircraft experienced a series of in-flight wing failures, often preceded by visible wing vibration or flutter, leading to mid-air breakups.
  • An FAA special review team identified multiple design deficiencies in the CH 601, primarily faulty wing stress analysis, inadequate aileron balance contributing to flutter, and issues with airspeed calibration.
  • Although the wing design was subsequently modified, the investigation highlighted significant discrepancies between manufacturer assumptions and federal standards, raising concerns about design rigor across the Light Sport Aircraft and homebuilt industry.
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According to an eyewitness whose attention was caught by the loud gunning of its engine as it approached the airport, the little two-seater’s wings both vibrated visibly before the left wing folded back against the fuselage. The airplane pitched downward and began to spin; the right wing then bent upward, and it too folded back against the fuselage. Moments later the airplane struck the ground and exploded in flames.

Two men were aboard: the 350-hour pilot-owner, who had bought the airplane from its amateur builder seven weeks earlier, and a 17,000-hour flight instructor. The airplane, equipped with a six-cylinder Jabiru engine of 110 hp, had been flown only 60 hours; this was its new owner’s first outing in it.

Peter Garrison

Peter Garrison taught himself to use a slide rule and tin snips, built an airplane in his backyard, and flew it to Japan. He began contributing to FLYING in 1968, and he continues to share his columns, ""Technicalities"" and ""Aftermath,"" with FLYING readers.

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