The AT-6 dropped 25lb BDU-33 and 500lb BDU-50 training rounds during the testing. HBC completed the operational assessment of AT-6 aircraft at Davis-Monthan Air Force Base in Tucson, Arizona, in October 2010.

Each engine can produce 1,600shp (1,193kW) of power. The second AT-6 prototype, which is powered by a Pratt & Whitney Canada PT6A-68D engine completed its maiden flight on 5 April 2010. The AT-6 prototype completed its first flight in September 2009, and entered the next phase of flight testing. Nearly identical to standard USAF and USN in terms of avionics, cockpit layout, and performance. CT-156 Harvard II Version of the T-6A for NTFC with the Canadian Forces. T-6D Texan II Version based on T-6B and C for the US Army for operational support, testing, utility, and chase plane roles.

T-6C Texan II Upgraded version of the T-6B with wing hard points, primarily designated for export sales. Engine power is increased to 1,600 shp (1193 kW) with the Pratt & Whitney Canada PT6-68D engine, and the structure is reinforced. It has the same digital cockpit, but upgraded to include datalink and integrated electro-optical sensors along with several weapons configurations. AT-6B Wolverine Armed version of the T-6B for primary weapons training or light attack roles. T-6B Texan II Upgraded version of the T-6A with a digital glass cockpit that includes a Head-Up Display (HUD), six multi-function displays (MFD) and Hands on Throttle And Stick (HOTAS), used at Naval Air Station Whiting Field, Naval Air Station Corpus Christi, and United States Naval Test Pilot School. T-6A NTA has the capability to carry rocket pods, gun pods, external fuel tanks, and bombs. T-6A NTA Texan II Armed version of the T-6A for the HAF (20). Variants Model 3000 Company designation T-6A Texan II Standard version for the USAF, USN, and Hellenic Air Force (25). The AT-6 design allows for advanced training with weapons delivery capabilities and the ability to conduct actual operational missions with the same platform. The multirole, multimission system is designed for net-centric intelligence, surveillance and reconnaissance (ISR) and light precision attack missions. HBC showcased the AT-6 at the Royal International Air Tattoo and Farnborough International Airshow in the UK in 2010. Through the addition of open architecture avionics, state-of-the-art sensors, datalinks, cockpit and aircraft protection components and various weapons capabilities to the proven training platform, the Beechcraft AT-6B provides multimission capability on a low-cost platform.

During the Farnborough Air Show in 2006, Hawker Beechcraft formally announced plans for the next spiral development of the successful T-6 platform into the AT-6B aircraft for the net-centric battlefield.

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