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Aftermath: A Pattern of Failure

Gemini Sparkle

Key Takeaways:

  • A series of in-flight wing failures of Zodiac CH 601 aircraft between 2006 and 2009 prompted an FAA investigation into the design.
  • The FAA's report identified several design deficiencies, including faulty wing stress analysis, issues with aileron balance (suggesting flutter), and airspeed calibration errors, which collectively could explain the breakups.
  • These deficiencies led to required wing modifications and static testing, with the manufacturer disputing some findings while accepting others.
  • The incidents raised broader concerns that aircraft design, particularly for light-sport and amateur-built planes, may involve significant discrepancies and non-conservative assumptions compared to robust engineering standards.
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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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