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)

 

Components

  • 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)

 

Performance

 

  • 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)

Middle East Propulsion Company (MEPC) is a Rolls-Royce T56 Authorized Maintenance and Overhaul Facility (AMOF) as the first company in the Middle East and North Africaregion. 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 for the RSAF C-130 Hercules aircraft. This service commenced in 2009.

 

T56 Capabilities:

 

  • Authorized Maintenance and Overhaul Facility (AMOF) by Rolls Royce
  • Eddy Current inspection. Globally MEPC is one of the only two companies to be approved by Rolls Royce to carry out this inspection.
  • T56-A-15 Engine Modules overhaul, repair
  • 501-D22A EngineModules overhaul, repair
  • Components and accessory overhaul, repair
  • Hot section and power section inspections, repairs
  • Foreign Object Damage (FOD) repair
  • Service Bulletin (S/B) compliance
  • Bore scope inspection
  • Metal In Filter (MIF) repair
  • Failure analysis
  • Spare parts supplying
  • Airbasessupport

 

Engine Specifications:

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.

Specification T56-A Series III T56-A Series IV
Power (shp) 4,591 5,250
Pressure ratio 11.3 11.5
Length (in) 146.3 146.1
Diameter (in) 27 27
Basic weight (lb) 1,920 1,940
Compressor 14HP 14HP
Turbine 4HP 4HP