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Hi BILLS,
I do not have an answer to your question but I am going to offer a little thought here. I have occasionally thought over the years that having manually operated cowl flaps would have been my preferred choice over the electric version that I have on my 73 G model 337. I have not had much problem over the 11 years that I have owned the airplane but one of my electric motors needed to be replaced years ago and the other was disassembled and cleaned up by my IA. These motors do occasionally require service which translates to dollars. I have thought that manually operating the cowl flaps as designed in the early model SkyMasters would have been the better of the two systems from a simplicity stand point. This is simply my opinion. Think about it. Maybe others can offer some opinion here as well.
Good Luck
Ed
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