Definition
An FAA document titled 'Major Repair and Alteration (Airframe, Powerplant, Propeller, or Appliance)' used to record any major repair or major alteration performed on a certificated aircraft. The form is completed by the person performing or approving the work, signed by an authorized mechanic or repair station, and a copy is retained in the aircraft's permanent maintenance records while another copy is sent to the FAA.
Plain English
A paperwork form that records important repairs or changes made to an aircraft. One copy stays with the aircraft's records and one copy goes to the FAA.
Context Anchor
A pilot may see FAA Form 337 in the aircraft maintenance records during a preflight review, aircraft purchase review, rental checkout, or inspection of aircraft documents.
Why Pilots Care
A completed Form 337 confirms that major work meets regulatory standards and the aircraft remains airworthy for flight.
Intuition Check
Do not treat FAA Form 337 as just any maintenance note or receipt. It is a specific FAA form for major repairs and major alterations, and it becomes part of the aircraft’s important records.
Example Sentence 1
While reviewing the aircraft records before her flight, she noticed a Form 337 documenting a recent engine mount repair.
Example Sentence 2
During preflight the pilot reviewed the logbooks and verified the FAA Form 337 for the recent wing repair was properly approved.