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There may be a backup electric system that is STC'd for the Skymaster but I don't know of any alternate system to completely eliminate the vac pumps for boots. The problem has always been that there is NO audience to entice suppliers / manufacturers to develop systems for our 337's. If we had a fleet like Bonanza's with owners willing to spend money on their airplanes the market would justify such options.
We love our birds but we are too small of a flock
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Herb R Harney
1968 337C
Flying the same Skymaster for 47 years
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