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There is an FAA advisory circular, AC 23-27, that allows us to use substituet materials to maintain our airplanes, certified prior to Jan 1, 1980, as long as it maintains fit, form and function of the original unit. What this means is that if you can find a FAA Form 337, Major Repair and Alteration form, that was field approved from the FAA, that is approval to do the same thing on your airplane, using that 337 as your approval data.
I just finished an IA renewal program where the head guy from FAA Headquarters was there and explained it.
Dave
N302A
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