After a repair is made to an aircraft engine, how many copies of GACA Form 8320-1/FAA Form 337 are required?

When a repair is made to an aircraft engine, the requirement is to submit two copies of GACA Form 8320-1/FAA Form 337. This form serves as a record of major repairs or alterations performed on the aircraft or its components.

The reason two copies are mandated is to ensure that one copy is retained by the person who performed the repair or alteration for their records, while the other copy is submitted to the relevant aviation authority for official documentation purposes. This process helps maintain a thorough maintenance history for the aircraft, which is crucial for safety and regulatory compliance. Each copy plays a significant role in tracking the repair history and ensuring that all regulatory requirements are met, thus supporting the overall safety and airworthiness of the aircraft.