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Aircraft Parts, aviation, FAA, FAA Design Approval, Manufacturing, PMA, Policy

MARPA Files Comments on FAA Geometry AC

MARPA recently filed comments on the FAA Engine and Propeller Directorate’s draft Advisory Circular 33-Geometry, discussing geometry and dimensional considerations for comparative test and analysis for turbine engine and APU replacement parts.  In a previous blog post we observed that AC identified a number dimensional and geometric factors that the FAA expects to be assessed in ensuring the integrity of dimensional characteristics for the purposes of showing similarity.

We requested feedback from our members describing to what extent the FAA’s expectations were reasonable and practicable, and identifying any issues with the proposed guidance on which MARPA should comment. We received several very helpful responses from our members that helped us shape our comments to the proposed AC. Among the issues members identified were:

    •  Possible confusion over availability of existing industry guidance;
    •  Apparent inconsistency with existing FAA guidance;
    •  Inaccurate implications that product testing is the only method available to collect data for lifing methods of life limited parts; and
    •  Issues regarding the specific practice of part selection for selective assembly components.

Feedback from our members is both helpful and valuable to our comments, as it helps us to identify issues that directly affect members’ businesses, and helps us to better focus our resources on those matters that are important to the PMA community.  The result is more detailed and on-point responses to the FAA to better help shape the guidance material that will ultimately be issued.

We greatly appreciate the feedback we received from our members on this Advisory Circular, and we hope that our members will continue to answers our requests for responses as additional guidance and rulemaking documents are issued.  Together we can work with the FAA to develop the best possible guidance for our industry.

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