FAA Form 337

The FAA form that must be filled in and submitted to the FAA when a major repair or major alteration has been completed. Federal Aviation Administration Flight Standards District Office (FAA FSDO). An FAA field office serving an assigned geographical area staffed with Flight Standards personnel who serve the aviation industry and the general public on matters relating to certification and operation of air carrier and general aviation aircraft.

Aviation Maintenance Technician Handbook — Airframe, p. G-15

The Major Repair and Alteration form that must be completed when an FAA-certificated aircraft or engine has been given a major repair or major alteration.

Aviation Maintenance Technician Handbook — Powerplant, p. G-12