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A repair station does not need to file a Form 337 for a major repair, although filing a Form 337 for a major repair would be permitted. Normally, however, a repair station can use the customer's work order in place of the Form 337. It must be a work order on which the details of the repair are recorded.

» Form 8100 9 is a document to be issued when an ODA approves or recommends approving the repair design that conforms to the FAR criteria. » With regard to the scope of ODA's approval, the category (structural, power plant, radio, etc.) and the content of the certificate (static analysis, safety analysis, etc.)

FAA Form 8110-3 is titled "STATEMENT OF COMPLIANCE WITH THE FEDERAL AVIATION REGULATIONS" and is used to approved or recommend for approval the data used in making alterations or repairs to aviation products or articles.

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.

The Aviation Safety Inspector can sign Block 3 of FAA Form 337 to approve the repair or alteration, or. Additional data from the applicant is needed if the original data package is found to be inadequate, or. The data needs Aircraft Certification Office review in light of its complexity or adequacy, or.

A field approval is the granting by an FAA airworthiness safety inspector of an FAA approval for a major repair or major alteration based on examination of data or physical inspection or testing. There are three kinds of field approvals for which the local FAA inspector can sign off in Block 3 of the FAA Form 337.

The person who performs or supervises a major repair or major alteration must prepare FAA Form 337. The form is executed at least in duplicate and is used to record major repairs and major alterations made to an aircraft, airframe, powerplant, propeller, appliance, or a component part thereof.