T-34C Turbo-Mentor, which can be distinguished from the B (piston) model by the extended nose and exhaust stacks on either side behind the prop. After a
production hiatus of almost 15 years, the T-34C Turbo-Mentor powered by a Pratt & Whitney Canada PT6A-25 turboprop engine was developed in 1973.
Development proceeded at the behest of the USN, which supplied two T-34Bs for conversion. After re-engining with the PT6, the two aircraft were
redesignated as YT-34Cs, the first of these flying with turboprop power for the first time on 21 September 1973. Mentor production re-started in 1975 for
deliveries of T-34Cs to the USN and of the T-34C-1 armed version for export customers in 1977, this version featuring four underwing hardpoints. The last
Turbo-Mentor rolled off the production line in 1990.