Local Offices

• Certification Branches – formerly Aircraft Certification Offices (ACO)
• Certificate Management Branches – formerly Manufacturing Inspection Offices (MIO)
• Certificate Management Sections – formerly Manufacturing Inspection District Offices (MIDO)

Which Local Office should I contact?

As a result of 2023 AIR Reorganization:

• The Integrated Certificate Management Division (AIR-500) was created to address certification, delegation, system oversight and continued operational safety functions with focus on commercial airplanes and engines.
• Aircraft Certification Offices (ACOs) are now Certification Branches
• Manufacturing Inspection District Offices (MIDOs) are now Certificate Management Sections.
• Manufacturing Inspection Offices (MIOs) are now Certificate Management Branches