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I used to fly Piper Arrows. For their turbo model they have a presurrized magneto kit (used to cost $250 back in the late 80's). If you didn't have it you'd tend to get missing from the arcing in the mags once you spent 1/2 hour or so over 12K-13K feet. Happened to me once and the dumb FBO said it had nothing to do with the mags. I had been flying at 14,500 and after about 1/2 hour, as mentioned, the missing started.
Called Piper customer support when I got home and the first question he asked me was "Does the airplane have the presurrized mag kit on it?"
All the kit does is would be the same mentioned in this thread - takes a little upper deck pressurized air and feeds it via a tube back into the magneto. Viola. It was a standard thing for the turbo Arrows.
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05-03-05, 06:14 PM
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