Who must be notified if the holder of an inspection authorization changes their fixed base of operation?

The requirement to notify the FAA Flight Standards District Office (FSDO) for the area of the new base when an inspection authorization holder changes their fixed base of operation is rooted in regulatory compliance and the need for accurate record-keeping. This notification ensures that the FSDO is aware of the current operating location of the IA holder, which is crucial for maintaining oversight and ensuring that the holder is meeting all requirements in that jurisdiction.

The FSDO is responsible for the oversight of all aviation maintenance activities in its respective area, and keeping them informed about changes in the location of IAs helps facilitate inspections, audits, and support to the maintenance organization. It also aids in informing the appropriate personnel about who they can reach regarding inspection authorizations in that new area.

Notifying the FSDO for the area of the old base or involving the FAA Regional Office is not necessary since these offices need to have up-to-date and relevant information pertaining to the new operating environment. The International Field Office is also not relevant in this scenario unless there is a specific international operation context involved, which is not indicated by the question.