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Engine and Powerplant FAQs

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  1. What is a Designated Engineering Representative (DER) for engines and powerplants?

    A DER is an FAA-authorized technical expert empowered to approve engineering data on behalf of the agency. In the engine/powerplant domain, a DER signs off on Test & Computations, and compliance matrices to ensure your PMA or repair-station submissions meet the applicable 14 CFR requirements.

  2. How can a DER accelerate my engine PMA approval?

    By authoring a DER-endorsed Test & Computations package and pre-auditing your submission, our DER minimizes FAA comments and shortens the approval cycle. Early DER involvement also aligns your design with Part 23, 25, and 33 and AC 21-303, reducing rework.

  3. Which engine components are eligible for PMA under DER support?

    We cover o-rings, fuel nozzles, fuel systems, accessory gearbox bearings,  shafts, and more. If your part interfaces with engine performance, our DER validates material specs, life-cycle testing, and identicality or Test & Computations pathways.

  4. Can a DER support Supplemental Type Certificates (STCs) for engine modifications?

    Yes. We provide support for Part 23, 25, and 33 STCs, TCs, and ATCs. 

  5. What documentation does Prime Propulsion deliver for engine PMA projects?

    Deliverables include an FAA-ready Compliance Matrix, DER Letter of Authorization, full Test & Computations report, First-Article Inspection report, Technical Data Package (TDP).

  6. How much does DER consulting for engine PMA and repair approvals cost?

    Pricing varies by scope—We’ll provide a detailed fixed priced quote after scoping your part complexity, test requirements, and expected DER‐hours.

  7. How do I schedule an Engine & Powerplant DER consultation with Prime Propulsion?

    Simply click the Contact Us at button on this page or email info@primepropulsion.com. We’ll arrange a 30-minute scoping call to discuss your engine component, regulatory path, and target timeline.

  8. What is turbine engine PMA DER consulting? Turbine engine PMA DER consulting is a specialized service in which a FAA-designated engineering representative (DER) guides you through the Parts Manufacturer Approval (PMA) process specifically for  engine components.

  9. What’s included in FAA DER test computations services?
    Our FAA DER test computations service delivers a turnkey analytical package that meets or exceeds AC 21-303 requirements and additional regulatory guidance such as AC 33-8. 

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