After making a repair to an aircraft engine that is to be returned to service, an FAA Form 337 is prepared. How many copies are required and what is the disposition of the completed forms?

After making a repair to an aircraft engine that is to be returned to service, an FAA Form 337 is prepared. How many copies are required and what is the disposition of the completed forms?

• A. Two; one copy for the aircraft owner and one copy for the FAA
• B. One; kept by the mechanic
• C. Three; owner, FAA, and operator
• D. Two; both copies retained by the operator

Answer: (A)

When a major repair or alteration is completed on an aircraft, Form 337 is used to document the change and its effect on airworthiness. After the repair, two copies are produced: one goes to the aircraft owner to be kept in the aircraft’s records, and the other is sent to the FAA and filed with the district office as part of the official regulatory record. The mechanic or repair station doesn’t keep the formal record by itself; the important records are with the owner and the FAA. This setup ensures regulatory traceability and that the owner has a copy for continued airworthiness documentation.

When a major repair or alteration is completed on an aircraft, Form 337 is used to document the change and its effect on airworthiness. After the repair, two copies are produced: one goes to the aircraft owner to be kept in the aircraft’s records, and the other is sent to the FAA and filed with the district office as part of the official regulatory record. The mechanic or repair station doesn’t keep the formal record by itself; the important records are with the owner and the FAA. This setup ensures regulatory traceability and that the owner has a copy for continued airworthiness documentation.