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).

Regulatory requirements for an Engine PMA

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

Procedural requirements for an engine PMA approval

• Order 8110.42, Parts Manufacturer Approval Procedures

Engine product PMA approval policies

• Turbine engine PMA policy:
  • Design Approval Procedures for PMA of Critical Engine and Propeller Parts (3/4/2005)
  • Repair and Alteration of Turbine Engine Life-limited Parts (7/27/06)
• Reciprocating Engine PMA Policy:
  • PMA or STC Approval of Reciprocating Engine External Accessory Replacement Parts, Part 33 (12/21/09)

Guidance Information for Turbine Engine Influencing Parts

• Engine LLP Influencing Parts presentation
• AIA Familiarization Guide: Influencing Parts Tool
• A DER Training module is available: Course 27200180, Powerplant: Engine Life-limited Parts–Influencing Parts can be taken via the FAA designee training system.