Form 337 which document is used to document FAA-approved major modifications and alterations?

Form 337 which document is used to document FAA-approved major modifications and alterations?

• A. Form 337
• B. Type Certificate Data Sheet
• C. Advisory Circular
• D. Manufacturer's Manual

Answer: (A)

Form 337 is the official record used to document FAA-approved major modifications and alterations. When a change to the airframe, engine, or propeller is significant enough to be considered a major alteration or repair, the work isn’t just noted in a logbook; it must be described on a Form 337. This form records the scope of the modification, the design data or data source used to implement it, and a declaration that the work complies with applicable airworthiness standards. It becomes part of the aircraft’s airworthiness records, and a copy is retained with the aircraft’s documentation, with the relevant authorities as required. The other items aren’t used for this purpose: the Type Certificate Data Sheet describes the original design approval, not post-production changes; an Advisory Circular provides guidance, not a formal modification record; and a Manufacturer’s Manual contains maintenance instructions, not the regulatory documentation for approved alterations.

Form 337 is the official record used to document FAA-approved major modifications and alterations. When a change to the airframe, engine, or propeller is significant enough to be considered a major alteration or repair, the work isn’t just noted in a logbook; it must be described on a Form 337. This form records the scope of the modification, the design data or data source used to implement it, and a declaration that the work complies with applicable airworthiness standards. It becomes part of the aircraft’s airworthiness records, and a copy is retained with the aircraft’s documentation, with the relevant authorities as required.

The other items aren’t used for this purpose: the Type Certificate Data Sheet describes the original design approval, not post-production changes; an Advisory Circular provides guidance, not a formal modification record; and a Manufacturer’s Manual contains maintenance instructions, not the regulatory documentation for approved alterations.