PPRuNe Forums - View Single Post - What happened to the 170a turning into wind thread?
Old 13th December 2011 | 20:04
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Big Pistons Forever
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All of the Cessna singles have a allowable static RPM range (eg C172M is 2300 to 2420 RPM). I teach this as a required check on every takeoff. The RPM is to be checked to ensure that it is within the range as soon as full throttle is applied as this is the only way to ensure an aircraft engine with a fixed pitch prop is developing full power. I also include a check of the oil pressure and temperature.
I call this the "good engine" check and expect it to be verbalized by all my students.

Since there is normally no requirement to go to full throttle on the runup, variations in RPM caused by wind loading (ie upwind vs downwind) are automatically adjusted because a fixed value for the runup is always set and so you simply use what ever throttle amount is need to get to that value (usually 1700 RPM).
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