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T56 :

The Allison T56 is a single shaft, modular design military turboprop with a 14 stage axial flow compressor driven by a four stage turbine. It was originally developed by the Allison Engine Company entering production in 1954, and is now produced under Rolls-Royce which acquired Allison in 1995. The commercial version is designated 501-D. Over 18,000 engines have been produced since 1954, logging over 200 million flying hours. MEPC provides MRO services on the T56 engines in partnership with Hellenic Aerospace Industries (HAI) for the RSAF C-130 Hercules aircraft. This service commenced in 2010 with the first modules being shipped for MRO services.

General characteristics

  • Type:Turboprop
  • Length: 146.1 in (3,711 mm)
  • Diameter:27 in (690 mm)
  • Dry weight:1,940 lb (880 kg)


  • Compressor:14 stage axial flow
  • Combustors: 6 cylindrical flow-through
  • Turbine:4 stage
  • Fuel type: JP8 2412 pounds per hour
  • 2 systems (1 each for power section and reduction gearbox)


  • Maximum Power output: 4,350 shp (3,915 kW) limited to 4,100
  • Overall pressure ratio: 14.5:1
  • Turbine inlet temperature: 860 c
  • Power-to-weight ratio: 2.75:1 (shp/lb)