What type of inspection can a holder of an inspection authorization perform or supervise?

A holder of an Inspection Authorization (IA) can perform or supervise both annual inspections and progressive inspections as specified in the regulations. The IA allows for more extensive responsibilities and the authority to conduct maintenance tasks that are more detailed than what is permitted for those without such authorization.

Annual inspections are comprehensive checks required for aircraft to ensure compliance with airworthiness standards. The holder of an IA is uniquely qualified to uphold the integrity and safety of these inspections, ensuring that all necessary procedures and guidelines are followed.

Progressive inspections provide a flexible maintenance approach, allowing for the inspection of an aircraft at regular intervals instead of undergoing a full annual inspection. This method can help maintain the aircraft in a more continuous state of airworthiness.

Both inspection types require a thorough understanding of regulations and a high level of expertise, making the holder of an IA specially equipped to handle these responsibilities effectively. The existence of both options in the correct answer reflects the versatile role that IAs play in aircraft maintenance.