The Honeywell TPE331 (military designation: T76) is a

turboprop A turboprop is a Gas turbine, gas turbine engine that drives an aircraft Propeller (aeronautics), propeller. A turboprop consists of an intake, reduction drive, reduction gearbox, gas compressor, compressor, combustor, turbine, and a propellin ...

engine. It was designed in the 1950s by Garrett AiResearch, and produced since 1999 by successor

Honeywell Aerospace Honeywell Aerospace Technologies is a manufacturer of aircraft engines and avionics, as well as a producer of auxiliary power units (APUs) and other aviation products. Headquartered in Phoenix, Arizona, it is a division of the Honeywell Intern ...

. The engine's power output ranges from .

Design and development

Garrett AiResearch designed the TPE331 from scratch 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. More than 700 had been shipped by the end of 1973. It was designed to be both a

turboshaft A turboshaft engine is a form of gas turbine that is optimized to produce shaft horsepower rather than jet thrust. In concept, turboshaft engines are very similar to turbojets, with additional turbine expansion to extract heat energy from the ex ...

(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 have 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)

;T76-G-2: ;T76-G-4: ;T76-G-6: ;T76-G-8: ;T76-G-10: ;T76-G-12: ;T76-G-12A: ;T76-G-14: ;T76-G-16: ;T76-G-410: ;T76-G-411: ;T76-G-416: ;T76-G-417: ;T76-G-418: ;T76-G-419: ;T76-G-420: ;T76-G-421:

Commercial variants (TPE331)

Applications

Fitted with TPE-331s as a replacement for their original engines

Specifications

References

Bibliography

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External links

TPE 331 Cost Protection Programs

TPE 331 Engine Conversions

Power and fuel flow versus altitude and speed
for version 10.
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