Air specialist (class 1) technician (AS1(T)), formerly senior aircraftman technician (SAC Tech or SAC(T)) until July 2022,[1] is a rank in the Royal Air Force, ranking between senior aircraftman and corporal and having a NATO rank code of OR-2.

[2] Air specialist technicians are not NCOs and can not administratively discipline other personnel.

The rank badge is a three-bladed propeller inside a circle.

This rank was introduced to distinguish airmen who had finished trade specific training, although they still required supervision from a corporal or senior NCO.

The insignia of a 3- or 4-bladed propeller surrounded by a circle was originally used after World War II to identify trade apprentices.