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Preflighting Propellers

Gemini Sparkle

Key Takeaways:

  • Always treat a propeller as "hot" due to the significant danger of inadvertent starts, even with dead or absent batteries, making manual movement extremely risky.
  • Thorough propeller inspection is crucial, requiring checks that extend beyond the leading edge to include the entire blade and tips, as subtle damage can be easily missed with standard preflight procedures.
  • Pilots are strongly advised against manually rotating the propeller during preflight and to ensure meticulous safety protocols, such as checking for keys, before any prop interaction.
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My old, long-gone flight instructor was maniacal about prop inspection (“Preflighting Propellers,” August 2020). Here in Boston, when we conducted preflight in the dead of winter, he would rotate the prop with a peculiar hand and foot arrangement that was “proper” in case of starting. Keys were always on top of the dash so we could see them walking around. Before touching the prop we looked for the keys as part of the process.

I have thought about this over the years and have come to the conclusion that if it is too cold for the engine to be turned over with the starter (he drew it through 360 degrees, I think to assure it was not stuck from the cold), then it is too cold for me to fly.

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