Engine Parts Manufacturer Approvals (PMA)

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A PMA is required for any person producing replacement or modification engine parts for sale and for installation on a type-certificated engine model. A PMA is a combined design and production approval for replacement parts. Also we may use a PMA for the production of certain modification parts approved under supplemental type certificates (STC).

• Procedural Regulation: 21.303 of 14 CFR part 21
• Airworthiness Regulation: 14 CFR part 33 (CAR 13 for older engines)

• Order 8110.42C, Parts Manufacturer Approval Procedures (6/23/2008)

• PMA Design Approvals Policy: Identically vs. Test and Computation (10/7/1998)
• Turbine engine PMA policy:
  1. Policy for the Design Approval of Parts Manufacturer Approval (PMA) of Critical and Life-Limited Aircraft Turbine Engine Parts (7/16/1998)
  2. Design Approval Procedures for PMA of Critical Engine and Propeller Parts (3/4/2005)
  3. Repair and Alteration of Turbine Engine Life-limited Parts (7/27/06)
• Reciprocating Engine PMA Policy:
  1. Policy for Parts Manufacturer Approval (PMA) of Reciprocating Engine Critical, Highly Stressed or Complex Parts or Components (4/10/1997)
  2. PMA or STC Approval of Reciprocating Engine External Accessory Replacement Parts, Part 33
  (12/21/09)