Senior aircraftman technician
Senior aircraftman technician (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. It is also subordinate to the Army and RAF Regiment rank of lance corporal, although SAC(T)s and junior technicians require a Corporal rank or above to be charged. This is due to ambiguities which arose within the charging Air Publication (AP) before the NATO rank systems were introduced and has never been amended since.
The rank, which is non-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(T). 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.