FAA: Who does not need a PMA for parts used or replaced on an aircraft:
"An Air Carriers Operating Under 14 CFR part 121 or 135 (Airlines and commuter aircraft.) Carriers may produce parts for installation on their own products without a PMA. We don’t require a PMA if the air carrier has accepted instructions and procedures in their manual. Also, the installation of the part must comply with 14 CFR Part 43. If air carriers intend to sell a part to other owners or operators, then they need a PMA.
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