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In reading a booked called "Design for Safety", by David Thurston, he
advises owners to "turn the propeller over by hand three or four times during preflight if the airplane has been standing for half a day or longer." [p169] His rationale is as follows. "When an engine has been standing for awhile and has not been pulled through by hand prior to starting, an accident could result if fuel or oil has collected in the cylinders. When the engine fires, trapped fluids can cause bent piston rods, cracked cylinders, or a damaged crankshaft. Althouogh such accidents might not cause bodily injury, they surely can harm one's budget and can beavoided by proper preflight procedures. It is also possible for damage of this type to remain hidden until something fails in flight" [pp 147-148]. I am quite surprised that this is the first I have heard such advice. What do folks on this newsgroup think of that advice? Does anyone out there do this routinely? If so, what is the proper procedure? Do you just turn the prop slowly in the direction the prop normally turns? Could fuel actually collect in the cylinders as suggested? Why would the fuel not just evaporate? -Sami M2057M, Piper Turbo Arrow III |
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