After completing their initial familiarisation and flying training on the Bulldog and Tucano two-seat aircraft, trainee Royal Air Force Navigators progress to the Dominie T1. This is a much larger aircraft, being a development of the early versions of the HS125 executive jet. Equipped as a flying classroom, the Dominie carries a wide range of navigation equipment and training is carried out at low, medium and high altitudes. Fast-jet navigators complete their training on the Hawk before progressing to an operational conversion unit.

Powerplant: Two Bristol Siddeley Viper 520 turbojets of 3,310lb st
Span: 47ft (14.33m)
Length: 47ft 5in (14.48m)
Max Speed: 472mph (755km/h)
Accommodation: Crew of two plus four students.

Recognition: Swept low-wing monoplane with two engines mounted on rear fuselage. Swept, almost T-type tail. Pronounced dorsal fairing forward of fin. Small ventral strake. Has four fuselage windows on each side.