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 TPE331 (military designation: T76) is a turboprop engine originally designed in the 1960s by Garrett AiResearch, and produced since 1999 by Honeywell Aerospace, 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]

Design and development[edit]

Garrett AiResearch designed it from scratch in 1959 for the military.[5] 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.[8] 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.[9]

As of July 2016, more than 13,500 TPE331 engines have been delivered, logging more than 122 million hours of flight time.[1] In April 2017, the series includes 18 models and 106 configurations and nearly 14,000 engines delivered logged more than 130 million flight hours.[5]

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.[10]


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),[11] 42.82 in (1,088 mm) (TPE331-10)[12]
  • Diameter: 21 in (533 mm) (TPE331-43A)[11]
  • Dry weight: 336 lb (153 kg) (TPE331-43A),[11] 385 lb (175 kg) (TPE331-10)[12]


  • 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. ^ "TPE". Honeywell Aerospace. Archived from the original on September 8, 2010. 
  4. ^ "TPE331-14 Turboprop Engine" Honeywell. Accessed: 29 August 2014.
  5. ^ a b "TPE331 Engines Offers Super Performance on Dornier 228 Aircraft" (Press release). Honeywell. April 2017. 
  6. ^ 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.
  7. ^ Canadian Museum of Flight, "Garrett TPE331"
  8. ^ Schoneberger and Scholl, p. 203.
  9. ^ Leyes, p. 725
  10. ^ Fred George (Jan 30, 2017). "Used Aircraft Report: Beech King Air B100". Business & Commercial Aviation. Aviation Week. 
  11. ^ a b c d e Canadian Museum of Flight "Garrett TPE331-43A"
  12. ^ a b c d e f "TPE331-10 Turboprop Engine" (PDF). Honeywell. April 2006. 

External links[edit]