What is the time frame to forward a duplicate copy of FAA Form 337 after inspection?

The time frame to forward a duplicate copy of FAA Form 337 after an inspection is 48 hours. This requirement ensures that the FAA is promptly notified of any major repairs or alterations to an aircraft. Timely documentation is crucial for maintaining accurate records and ensuring that the aircraft's airworthiness status is updated.

In the context of aviation maintenance and safety regulations, the 48-hour window allows both maintenance personnel and the FAA to efficiently track and manage alterations, reinforcing safety protocols. This timeframe is set forth to ensure that critical changes to the aircraft's condition are communicated without delay, helping to maintain compliance with airworthiness standards.

Other options, such as 24 hours, 72 hours, or 1 week, do not align with the regulatory requirements established by the FAA regarding the documentation of significant changes to aircraft repairs or alterations.