One I don't see here is a reference to a mechanic. I think it was IA? Any idea what this is?
Inspection
Authorization.
An add on rating to an A&P mechanic (Airframe & Powerplant) license.
An IA is necessary to sign off an annual inspection or the bottom of a FAA Form 337, Major Alteration or Repair form. An A&P can sign for the work done for the Form 337, but an IA must sign the inspection box (the same person, if an IA, may sign both places on the form)
Charles