Allison T56

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Contents

Introduction

The Allison T56 is a single shaft, modular design military turboprop with a 14 stage axial flow compressor driven by a four stage turbine.

Description

It was originally developed by the Allison Engine Company for the C-130 Hercules entering production in 1954. It is now produced under Rolls-Royce which acquired Allison in 1995. The commercial version is designated 501-D. With an unusually long and numerous production run, over 18,000 engines have been produced since 1954. The engine evolved from Allison's previous T-38 series. It was first flown in the nose of a Boeing B-17 test-bed aircraft in 1954.

Versions

Commercial designations

Series I

Series I include models 501-D13,A, D, and H.

Series II

Series II include models 501-D22 and 501-D36A (non-type certified).

Series III

Series III include models 501-D22A, C, and G. Rated at 3,424 kW.

Series III.V

A fuel efficient and reliable upgrade to the Series III. Proposed military designations are T56-A-14+, T56-A-15+ and T56-A-16+. First flown September 2012. T56-A-425+

Series IV

Model rated at 3,915 kW, supplied as T56-A-427 and T56-A-427A.

Military designations

T56-A-1

Initial model for the C-130A Hercules rated at 2,796 kW. Company designation Model 501-D13. The -A-1 was tested in the YC-131C Samaritan.

T56-A-2

Model studied by the US Navy for helicopter purposes. Not built.

T56-A-3

Experimental version, designated YT56-A-3, also tested in the YC-131C Samaritan.

T56-A-4

Retrofitted to C-131Ds as VC-131H executive transport.

T56-A-5

Developed for the YH-16B helicopter.

T56-A-6

Experimental straight jet version of the T56, designated YT56-A-6 and test flown on the NC-130B Hercules to provide upper surface blowing to the Herc's wings and thus improving its STOL performance.

T56-A-7

Series II model for the C-130B Hercules powering four-bladed propellers and rated at 3,020 kW. Produced as T56-A-7A for the C-130E Hercules.

T56-A-8

Model for the E-2A Hawkeye, produced or upgraded in -8, -8A and -8B model.

T56-A-9

Series I production model for the C-130A Hercules, powering three-bladed propellers.

T56-A-10W

Series II model for the P-3A Orion, fitted with water-methanol injection system to improve engine performance during take-off. Existing -10W models could be upgraded to T56-A-14.

T56-A-11

The T56-A-11 engine is a T56-A-9 power section which has been modified to operate with kerosene fuel. The T56-A-11 engine uses the same gearbox as the T56-A-7 engine. The weight of the -11 engine is approximately 100 pounds greater than the -9 and has the Aeroproducts Model A6341FN-D1A, 3 bladed propeller.

T56-A-14

Series III model for the P-3B/C Orion, lacking the water methanol injection system. Rated at 3,661 kW. In 2012, Rolls-Royce announced the T56-A-14+ conversion kit (commercial designation Series III.V), providing eight percent fuel savings over the existing model.

T56-A-15

Series III model for the C-130H Hercules and several C-130 re-engine programs. Rated at 3,210 kW. In 2012, Rolls-Royce announced the T56-A-15+ conversion kit (commercial designation Series III.V), providing eight percent fuel savings over the existing model.

T56-A-16

Series III model for the AC-130U Spooky, MC-130H Talon II, MC-130W Combat Spear and KC-130R/T Hercules. In 2012, Rolls-Royce announced the T56-A-16+ conversion kit (commercial designation Series III.V), providing eight percent fuel savings over the existing model.

T56-A-425

Series III model for the E-2C Group 0 Hawkeye.

T56-A-427

Model for the E-2C Group I and (in its -427A form) for the E-2D Advanced Hawkeye.

Supported platforms

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