Senior aircraftman technician
Senior Aircraftman Technician (SAC Tech or formerly SAC(T)) is a rank in the Royal Air Force, ranking between Senior Aircraftman and Corporal and having a NATO rank code of OR-2. SAC Technicians are not NCOs and cannot administratively discipline other personnel.
The rank, which is self-supervisory, was introduced in 2000 to replace Junior Technician (although Junior Technicians promoted before this date retain their rank). The rank badge is a three-bladed propeller inside a circle.
From March 2005, SACs in technical trades who had attained the Operational Performance Standard were promoted to SAC Tech. This rank was introduced to distinguish airmen trained to work unsupervised from those who were not.
Previous use of insignia
The insignia of a 3 or 4 bladed propeller surrounded by a circle was originally used after World War II to identify trade apprentices. It fell out of use after a very short period in service.