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GMAs, someone quite knowledgeable on aircraft in general and Skymasters in particular, and a past contributor to this forum, believes that the information given to Paul is in error, and that a 337 is required. This is contained in a lengthy message sent to some. I'm just the messenger here. GMAs believes that the cited installation without a 337 could get the owner in trouble. I don't want that to happen. Perhaps we need another opinion here.
Ernie
PS. While I don't consider myself sufficiently knowledgeable in this area to render an opinion, I do know that portable traffic-warning devices (about the size of a pack of cigarettes and costing around $600) can be used as long as they are powered by batteries or from the cigarette lighter on the airplane. When we attempted to hard-wire it to the electrical system, we were told that a 337 would be needed. FWIW.
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