of the Swedish Air Force. In October 2009, Saab proposed to replace the Swedish Air Force's Sk 60 trainers with the Embraer Super Tucano. In March 2014, the Swedish Air Force publicly acknowledged that it was to begin studying replacement options for the Saab 105; Major General Micael Bydén observed that multinational training opportunities were being examined and that prospective replacement aircraft include the Alenia Aermacchi M-346, BAE Systems Hawk and Pilatus PC-21. On 28 March 2014, Saab and Pilatus Aircraft signed a memorandum of understanding to offer the PC-21 to the Swedish Air Force. On 29 April 2015, a request for information (RFI) was issued by the Defence Materiel Administration (FMV) for a new Military Flying Training System to provide long term basic and advanced training fleet functions; the advanced trainer requirements specify the presence of an embedded training capability including simulated radar and weapons use, as well as tactical displays in both cockpit positions resembling fourth and fifth-generation jet fighter aircraft. In 2020 Saab signed a new service agreement with the Swedish Armed Forces to provide support for the Saab 105 to 2025, with one year option to 2026. In May 2021 the Grob G 120TP was chosen to be the new basic trainer for the Swedish Air force with first airplanes to be operational in 2023. Variants Saab 105 Prototype. Two built. Sk 60A Two-seat jet trainer, liaison aircraft for the Swedish Air Force. 149 built as Sk 60A. Sk 60B Two-seat attack version for the Swedish Air Force, modified from Sk 60A with new weapons sight. Sk 60C Two-seat ground attack/reconnaissance version for the Swedish Air Force with extended camera nose. One new-build prototype and 29 conversions from Sk 60A. Sk 60D Saab had also designed the Saab 105 for use as a four-seat liaison transport: the two ejection seats could be removed and quickly replaced with four airline-type seats, with no provision for wearing a parachute; or four more austere seats that allowed the wearing of parachutes. In the mid-1970s, ten SK 60A aircraft were permanently configured as transports and given the designation of "SK 60D". Some were painted in the light green/dark green/tan "splinter" camouflage associated with the Saab Viggen fighter. Sk 60E This variant was a similar four-seat SK 60A conversion, but featured commercial-type instruments, including an instrument landing system. It was used to help train Flygvapnet reserve pilots in flying commercial aircraft.