Chief technician (Chf Tech or formerly C/T) is a senior non-commissioned rank in the Royal Air Force which is only held by aviators in technical trades and by musicians.
During that period it was equivalent to flight sergeant, but was made junior to that rank in 1964.
The rank of Chief Technician falls into Supplement 3 Pay Scales, an exception is Weapons Technician, which falls into Supplement 2 Pay Scales.
This enhanced pay rewards those who wish to take on a technical trade.
To mitigate the extra ranks, a Chief Technician is said to receive a 'Flight Sergeants pension" after 2 years in rank and are currently receiving an extra uplift in pay (daily), due to holding "technical status", as part of the DERR Policy set out on NEM2016.