Garrett TPE331

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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]

The Garrett AiResearch TPE331 is a turboprop engine originally designed and manufactured by Garrett AiResearch, and produced by Honeywell Aerospace since 1999 after AlliedSignal/Garrett acquired Honeywell, keeping the Honeywell name. The TPE331 family includes 18 models and 106 configurations; the engines range from 575 to 1650 shaft horsepower.[2][3][4] The military version is designated the T76.

Design and development[edit]

The TPE331 originated in 1961 as a gas turbine (the "331") to power helicopters.[5] It first went into production in 1963.[6] More than 700 had been shipped by the end of 1973.[7] 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.[8]

As of July 2016, more than 13,500 TPE331 engines have been delivered, logging more than 122 million hours of flight time.[1] 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 with $130,000 HSI checks and $190,000 overhauls.[9]


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


Cutaway view of a TPE-331

General characteristics

  • Type: Single-shaft turboprop with integral gearbox
  • Length: 46 in (1168 mm) (TPE331-43A),[10] 42.82 in (1,088 mm) (TPE331-10)[11]
  • Diameter: 21 in (533 mm) (TPE331-43A)[10]
  • Dry weight: 336 lb (153 kg) (TPE331-43A),[10] 385 lb (175 kg) (TPE331-10)[11]


  • Compressor: Two-stage centrifugal
  • Combustors: Reverse annular
  • Turbine: Three-stage axial


See also[edit]

Comparable engines
Related lists


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


  1. ^ a b "Honeywell Continues to Hone Turboprop Engine for 50th Anniversary" (Press release). Honeywell. July 2016. 
  2. ^ "Honeywell Aerospace TPE331 Spec Chart" Honeywell. Accessed: 29 August 2014.
  3. ^ [1] Archived September 8, 2010, at the Wayback Machine.
  4. ^ "TPE331-14 Turboprop Engine" Honeywell. Accessed: 29 August 2014.
  5. ^ William A. Schoneberger and Robert R. H. Scholl, Out of Thin Air: Garrett's First 50 Years, Phoenix: Garrett Corporation, 1985 (ISBN 0-9617029-0-7), pp. 174-5.
  6. ^ Canadian Museum of Flight, "Garrett TPE331"
  7. ^ Schoneberger and Scholl, p. 203.
  8. ^ Leyes, p. 725
  9. ^ Fred George (Jan 30, 2017). "Used Aircraft Report: Beech King Air B100". Business & Commercial Aviation. Aviation Week. 
  10. ^ a b c d e Canadian Museum of Flight "Garrett TPE331-43A"
  11. ^ a b c d e f "TPE331-10 Turboprop Engine" (PDF). Honeywell. April 2006. 

External links[edit]