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The determination of whether a proposed change in design, power, thrust, or weight to an existing type certified aircraft, engine, or propeller is acceptable under a STC is proposed by the design holder, and subjected to the approval of the FAA. If the FAA finds that the proposed changes are too
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substantial, a new type certificate will be required under 14 CFR 21.19. In this case, a substantially complete investigation of compliance with the applicable regulations will be required.
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In 2010 at the US/Europe
International Aviation Safety Conference, Eurocopter discussed concerns about potential risks with, and incompatibilities in, STCs. In response the
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Some civil aviation authorities also issue
Limited or LSTCs that are only applicable to a single aircraft or small number of specific serial numbers.
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94:(PMA) industry had experienced in implementing Continued Operational Safety (COS) programs for the prediction and proactive addressing of hazards.
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The
European Union regulations for STCs are found Commission Regulation (EU) No 748/2012 of 3 August 2012 as amended, Part-21, Subpart E et seq.
195:, Aircraft Certification Information Session 3 (Summary of Major Discussion Points, produced by the Federal Aviation Administration).
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52:-approved major modification or repair to an existing type certified aircraft, engine or propeller. As it adds to the existing
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A supplemental type certificate (STC) originally issued in 1960 by the
Federal Aviation Administration (FAA)
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Commission
Regulation (EU) No 748/2012 of 3 August 2012 as amended, Part-21, Subpart E
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The United States regulations for STCs are found at 14 CFR 21.111.
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Document of approval for modifications or repairs to an aircraft
112:"Part 21 Certification Procedures for Products and Articles"
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