Honeywell TPE331
turboprop engine family by Garrett AiResearch
The Honeywell TPE331 (military designation: T76) is a turboprop engine. It was designed in the 1950s by Garrett AiResearch and has been produced since 1999 by its successor, Honeywell Aerospace. The engine's power output ranges from 575 to 1,650 shaft horsepower (429 to 1,230 kW).
Design and development
Garrett AiResearch began developing the TPE331 in 1959 for the military. "Designed as a 575-horsepower engine it was not a scaled-down version of a larger engine, as competitors were offering."
The TPE331 originated in 1961 as a gas turbine (the "331") to power helicopters. It first went into production in 1963. By the end of 1973, more than 700 units had been shipped. It was designed to be both a turboshaft (TSE331) and a turboprop (TPE331), but the turboshaft version never went into production. The first engine was produced in 1963, installed on the Aero Commander in 1964, and put into production on the Aero Commander Turbo Commander in June 1965.
Performance
The 715 shp TPE331-6 used in the Beechcraft King Air B100 has a 400-hr fuel nozzle cleaning interval, 1,800-hr hot section inspection interval, and a 5,400-hr time between overhaul; approval is possible for 3,000-hr HSIs and 6,000-hr overhauls, and engine reserves are cheaper than for the PT6A.
Variants
Military variants (T76)
Commercial variants (TPE331)
Applications
Fitted with TPE-331s as a replacement for their original engines
Specifications
General characteristics
Type: Single-shaft turboprop with integral gearbox
Length: 46 inches (1,200 mm) (TPE331-43A), 42.82 in (1,088 mm) (TPE331-10)
Diameter: 21 inches (530 mm) (TPE331-43A)
Dry weight: 336 lb (152 kg) (TPE331-43A), 385 lb (175 kg) (TPE331-10)
Components
Compressor: Two-stage centrifugal
Combustors: Reverse annular
Turbine: Three-stage axial
Fuel type: Jet A, Jet B, Jet A-1, JP-8, JP-1, JP-4, JP-5, JP8+100
Performance
Maximum power output: 575 hp (429 kW) (TPE331-43A), 940 hp (700 kW) (TPE331-10)
Overall pressure ratio: 10.55:1 (TPE331-10)
Specific fuel consumption: 0.534 lb/(hp⋅h) (325 g/kWh) (TPE331-10)
Power-to-weight ratio: 1.71 hp/lb (2.81 kW/kg) (TPE331-43A), 2.44 hp/lb (4.01 kW/kg) (TPE331-10)
See also
Comparable engines
General Electric Catalyst
Pratt & Whitney Canada PT6
Walter M601
Related lists
List of aircraft engines
References
Bibliography
External links
TPE 331 Cost Protection Programs[link removed]
TPE 331 Engine Conversions[link removed]
Power and fuel flow versus altitude and speed, for version 10.
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