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Throttled

Engine failure. Take a breath and collect yourself. Hopefully you have a flow memorized to try and restore power, and maybe it includes the fuel selector, mixture control, boost pump, magnetos and more. But what about the throttle?

Gemini Sparkle

Key Takeaways:

  • The author's decision to relocate and complicate the throttle system on a light sport aircraft, departing from the original factory design, created new and unforeseen problems.
  • Despite observing sloppy workmanship and a defective throttle lever (only opening 75%) after the modification, the author unfortunately chose to disregard these critical warning signs.
  • These overlooked issues culminated in a dangerous incident where the engine unexpectedly accelerated after touchdown, leading to a challenging ground loop and highlighting the risks of unnecessary modifications and ignoring safety concerns.
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Ipurchased a popular light sport that had been sitting in a hangar after the builder injured his back. We both walked away happy with the sale, but I soon decided it needed an engine with more horsepower. I worked with an A&P and builder to coordinate the engine upgrade, and we agreed on a number of other projects, one of which involved relocating the throttle.

This was my first mistake, not leaving well enough alone. Clearly the factory knew a simple, foolproof throttle easily reached by both pilots was the way to go. Fabricating a dual-throttle so both pilots can fly with one hand on the stick and the other on the throttle ended up introducing problems that didn’t exist before.

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