> If you want to remove the generator and install an > alternator, you MUST > buy the STC from the owner, then have your AP install it and > your IA can sign it off.
This is not entirely accurate. You do not have to buy the STC. You may choose to go the "one time field approval" route. It is then up to you and your IA to convince the FAA inspector to approve the work. The benefit of using an existing STC is that approval is automatic.
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