Operating in 70 countries
More than 200 million operating hours
The T56 is a robust, reliable turboprop engine operating in military and civil aircraft worldwide. The engine’s commercial version, the T56 501-D, is the world-leading large turboprop engine.
Since the engine entered production in 1954 more than 18,000 T56/501-D turboprops have been installed on a variety of propeller-driven aircraft, including Lockheed Martin's C-130 Hercules and L-100 transports, Northrop Grumman's E-2 Hawkeye early warning aircraft and Lockheed Martin’s P-3C Orion anti-submarine warfare aircraft. The Convair 580 and Lockheed Martin Electra are currently in commercial passenger and cargo service around the world.
A new engine enhancement, the T56 Series 3.5 Engine Enhancement Package, uses proven Rolls-Royce technology and materials to improve fuel efficiency, reduce maintenance costs, increase reliability and enhance performance. The Series 3.5 package delivers dramatic improvements, which require no changes to the aircraft or controls.
The T56 is a single shaft, modular design, turboprop engine with a 14-stage axial flow compressor driven by a four-stage turbine unit. The gearbox has two stages of gear reduction, features a propeller brake and is connected to the power section by a torquemeter assembly. Other engine modules are the can-annular type combustor and the accessory drive housing.
T56-A Series III
T56-A Series IV
Basic weight (lb)
Lockheed Martin C-130A-H Hercules, Lockheed Martin P-3C Orion, Northrop Grumman E-2C Hawkeye, E-2C, Northrop Grumman C-2A Greyhound