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Insidious Icing

Honeywell's “flight to nowhere” would test the so-called “Connected Aircraft” suite of technology apps enabled by a lightning fast Inmarsat GX satcom connection. Honeywell
Gemini Sparkle

Key Takeaways:

  • Carburetor ice is a significant cause of engine stoppage in aircraft, as experienced by the author, often occurring during low-speed flight or descents.
  • Ice primarily forms on the partially closed throttle valve, not the venturi, due to the substantial temperature drop caused by fuel evaporation downstream.
  • To prevent carburetor ice, it is recommended to use carb heat during descents, low-speed cruise in humid conditions, or when visible moisture is present.
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I was tootling along at low speed in my little experimental, leaning out the Marvel-Schebler carburetor one nice day, when the engine suddenly stopped. I immediately went through the restart procedures, but to no avail. Realizing that I had run out of options, I turned my little Sonex into the wind and landed on a hillside recently planted in wheat. I was later able to take off from a nearby highway and fly back to the airport. Nature had been kind to me. 

The throttle setting was relatively low, and the temperature-dew point spread was not too high either. It must have been carburetor ice!

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