Y12F is a civilian variant with big improvement over Y12D and Y12E.
Y-12F: The latest development with almost everything redesigned: wider fuselage, new wings, retractable landing gear and more powerful engines.
The turbine engines are more powerful PT6A-65B. Due to all the improvement, Y-12F has high cruise speed and long range, it can accommodate 19 passenger or carry cargo in 3 LD3 containers.
The design started at April 2005 and maiden flight on December 29, 2010.[12] It received the CAAC type certification on December 10, 2015, and the FAA type certification on February 22, 2016.[5] Y-12F has passed evaluation flight tests for its automatic flight control system by the FAA on June 30, 2018.