The General Electric TF34 is an American military turbofan engine used on the A-10 Thunderbolt II and S-3 Viking. Design and development Developed by GE Aircraft Engines during the late 1960s, the original engine comprises a single stage fan, driven by a 4-stage low pressure (LP) turbine, supercharging a 14-stage high pressure (HP) compressor, driven by a 2-stage HP turbine. An annular combustor is featured. The TF34-GE-400A is rated at 9,275 lbf (41.26 kN) static thrust. The civilian variant, the CF34, is used on a number of business and regional jets. Variants TF34-GE-2 Initial variant for Lockheed S-3, entered production in August 1972. TF34-GE-100 Variant for Fairchild A-10A, first flown in A-10 during May 1972. Production began in October 1974. TF34-GE-400A Improved version of GE-2 for Lockheed S-3. Applications Fairchild Republic A-10 Thunderbolt II Lockheed S-3 Viking Lockheed Martin RQ-170 Sentinel Sikorsky S-72 Specifications (TF34-GE-400A) See also References Taylor, John W.R. Jane's All the World's Aircraft 1982-83., London, Jane's Publishing Company Ltd, 1982. . External links General Electric TF34 page TF34 High-bypass turbofan engines 1960s turbofan engines