What documentation is required to accompany a major alteration when applicable?

What documentation is required to accompany a major alteration when applicable?

• A. No Form 337 is required for major alterations.
• B. A simple maintenance tag suffices.
• C. A basic note in the logbook is all that is needed.
• D. Form 337 is required to accompany a major alteration when required.

Answer: (D)

When a modification is considered major, formal documentation is required to record the change and provide a traceable airworthiness history. Form 337, Major Repair and Alteration, is the official document used to detail the alteration, the parts and drawings involved, and the approvals by the mechanic and owner. It must be filed with the FAA (in duplicate) and retained in the aircraft’s permanent maintenance records, with a copy kept by the owner. This ensures the modification is inspected, approved, and meets applicable standards, and that the FAA has a record of the change for future inspections and determinations of airworthiness. For minor repairs or routine maintenance, Form 337 isn’t required.

When a modification is considered major, formal documentation is required to record the change and provide a traceable airworthiness history. Form 337, Major Repair and Alteration, is the official document used to detail the alteration, the parts and drawings involved, and the approvals by the mechanic and owner. It must be filed with the FAA (in duplicate) and retained in the aircraft’s permanent maintenance records, with a copy kept by the owner. This ensures the modification is inspected, approved, and meets applicable standards, and that the FAA has a record of the change for future inspections and determinations of airworthiness. For minor repairs or routine maintenance, Form 337 isn’t required.