Pawnee

[Karl Landl]

Fellow Tow Pilots:

You may say why do I get involved in this but the fact is that years ago the CGC had problems with cracked cylinders on their Pawnee. I did not know that Ray Konrath whom I’ve known for decades was involved in the pre-purchase inspection of our Pawnee. I asked him if he would be so kind and inform our tow pilots on the recommended let-down procedure that the CGC uses regarding the Pawnee and here is what he said: The CGC rules after tow release are: Reduce rpm to 2000 after release, airspeed under 100 mph. Lean mixture if desired, decrease rpm by 100 rpm every 30 seconds or 10 degrees CHT reduction until 1500 rpm. Monitor CHT for cool down less than 30 degrees per minute. (If the Pawnee does not have a CHT then the pilot NEVER knows what is happening with the engine cylinders). Apparently this procedure solved the problems.

I hope this helps,

Karl

[Larry Kase]

Thanks

Sent from my iPad

[ANDRZEJ CHICEWICZ]

https://www.lycoming.com/content/how-avoid-sudden-cooling-your-engine

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