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For any major changes to the design of an aircraft, a Supplemental Type Certificate (STC) is required from CAAS as approval for the change. A major change is a change that might appreciably affect the weight, balance, structural strength, and other aircraft characteristics.

A supplemental type certificate ( STC ) is a type certificate ( TC ) issued when an applicant has received FAA approval to modify an aeronautical product from its original design.

An STC applicant submits a certification plan to the FAA that details the proposed alteration to a type-certified product and how that alteration will comply with the applicable FAA regulations and guidance material. The FAA reviews the certification plan and issues an STC project number if the plan is accepted.

An STC will be issued only if: the pertinent technical data have been examined and found satisfactory, all necessary tests and compliance inspections have been completed, and. the alteration has been found to conform with the technical data.

The purpose of an STC is to create a permanent certified approval for the modifition of an aircraft in a particular way. The purpose of a 337 is to document a major repair or alteration of an aircraft.

Certification affirms that FAA requirements have been met. 14 CFR Part 21 defines three separate certifications: type, production, and airworthiness.

An STC applicant submits a certification plan to the FAA that details the proposed alteration to a type-certified product and how that alteration will comply with the applicable FAA regulations and guidance material. The FAA reviews the certification plan and issues an STC project number if the plan is accepted.

The purpose of an STC is to create a permanent certified approval for the modifition of an aircraft in a particular way. The purpose of a 337 is to document a major repair or alteration of an aircraft.