What is the meaning of ACAI and ATCI in Air Cadets? For my staff cadet course, I need to know what ACAI and ACTI stand for but I can't find it anywhere. Would anybody be able to notify me of what this means?
Those four letters can be abbreviations for many things related to aviation. Taking into account that this is for a staff cadet course, I think the most likely candidates are:


Air Cadet Administrative
Instructions
Air Cadet Training Instructions  


Source