Purpose
Due to their inherent criticality, all changes to the design of an aircraft are required to be approved in some form. How this is achieved will vary from country to country. Generally, modifications and repairs deemed to be 'minor', such as the installation of a radio or the repair to upholstery, may be approved by the aircraft mechanic or maintenance engineer. However, larger changes, such as changing the type of engine or increasing the maximum weight, are deemed 'major' and require formal approval from the NAA or NAA approved person or organization.
Under the U.S. FAA's regulatory system, there are various methods to obtain approval for a major modification or repair to a type-certified aircraft (the following list is not exhaustive):
- A data approval issued by a Designated Engineering Representative which is usually issued on a FAA Form 8110-3
- A data approval issued by an Organization Designation Authorization Holder using ODA Procedures
- A Field Repair which may be issued on a FAA Form 337, or
- A Supplemental (or Supplementary) Type Certificate (STC).
Read more about this topic: Supplemental Type Certificate
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