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John C.
 
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On 16 Mar 2005 19:51:01 -0800, wrote:

GA is a little different issue. AFAIK under the relevant Part of the
FARs-I don't remember which-scheduled airlines have the authority to
manufacture parts for their own use, without a PMA or buying the TC,
provided they can show conformity to the certificated part. Transport
category aircraft are a whole different business and most of them in
Mojave have earned their retirement.

As an airline, you can repair many parts yourself, and with
engineering approval even mfgr parts. You cannot, however sell them to
another airline. Most of the parts airlines mfgr are sheetmetal of
course, and interior pieces. Also tubing, wiring, etc.
John