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The Honeywell TPE331 (military designation: T76) is a turboprop engine. It was originally designed in the 1960s by Garrett AiResearch, and produced since 1999 by Honeywell Aerospace. The engines power output ranges from 575 to 1650 shaft horsepower (shp).[2][3][4]

TPE331 / T76
Honeywell (Garrett) TPE331-14.jpg
Type Turboprop
National origin United States
Manufacturer Garrett AiResearch
Honeywell Aerospace
First run 1960
Major applications Fairchild Swearingen Metroliner
Mitsubishi MU-2
Rockwell Turbo Commander
Number built 13,500+[1]

Design and developmentEdit

Garrett AiResearch designed the TPE331 from scratch in 1959 for the military.[5] “Designed as a 575-horsepower engine it was not a scaled-down version of a larger engine, as competitors were offering.”[6] The TPE331 originated in 1961 as a gas turbine (the "331") to power helicopters.[6] It first went into production in 1963.[7] More than 700 had been shipped by the end of 1973.[6] 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.[citation needed]


The 715 shp TPE331-6 used in the Beech 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.[8]



Cutaway view of a TPE-331

General characteristics

  • Type: Single-shaft turboprop with integral gearbox
  • Length: 46 inches (1,200 mm) (TPE331-43A),[7] 42.82 in (1,088 mm) (TPE331-10)[9]
  • Diameter: 21 inches (530 mm) (TPE331-43A)[7]
  • Dry weight: 336 lb (152 kg) (TPE331-43A),[7] 385 lb (175 kg) (TPE331-10)[9]



See alsoEdit


^ These aircraft were fitted with TPE-331s as a modification to replace their original engines


  1. ^ Brecken, Steve (July 2016). "Honeywell Continues to Hone Turboprop Engine for 50th Anniversary" (Press release). Phoenix, Arizona: Honeywell Aerospace. Archived from the original on 2019-07-04.
  2. ^ "TPE331 Spec Chart". Honeywell Aerospace. Archived from the original (PDF) on 2014-09-03. Retrieved 2014-08-29.
  3. ^ "TPE". Products & Services. Honeywell Aerospace. Archived from the original on 2010-09-08.
  4. ^ "TPE331-14 Turboprop Engine" (PDF). Honeywell Aerospace. 2006-07-10. Archived from the original (PDF) on 2014-09-03. Retrieved 2014-08-29.
  5. ^ "TPE331 Engines Offers Super Performance on Dornier 228 Aircraft" (Press release). Phoenix, Arizona: Honeywell Aerospace. 2017-04-11.
  6. ^ a b c Schoneberger, William A.; Scholl, Robert R. H. (1985). Out of Thin Air: Garrett's First 50 Years. Garrett Corporation. pp. 153, 174–175, 203. ISBN 9780961702908.
  7. ^ a b c d e f "Garrett TPE331". Collection. Canadian Museum of Flight. Archived from the original on 2019-07-04.
  8. ^ George, Fred (2017-01-30). "Used Aircraft Report: Beech King Air B100". Business & Commercial Aviation. Aviation Week Network.
  9. ^ a b c d e f "TPE331-10 Turboprop Engine" (PDF). Honeywell Aerospace. April 2006. Archived from the original (PDF) on 2012-07-19.

External linksEdit