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#4
November 19th 03, 07:03 PM
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Bob Noel wrote:
If the part is not PMA'd for your aircraft, you'll need a different "basis" for the approval of the installation in your aircraft. This does not need to be via an STC. Ah, so a PMA is aircraft-specific? That's a little suprising - although reasonable in retrospect - as a number of aftermarket instrument lighting vendors advertise that their product is "PMA certified", or some such. No mention is made of "...for the following aircraft...". As an example, a digital OAT probe I installed in my cherokee was PMA'd for certain beechcraft aircraft but not my cherokee. The installation this digital OAT probe was approved via a 337. I'm confused about the role of a 337. When is one required? One example is what you've cited: a change for which neither PMA nor STC exists. But is one required for a replacement with a PMAed "part"? Is one required for an STCed alteration? - Andrew 
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