Garrett ATF3

ATF3 / F104
A Dassault HU-25 Guardian, powered by two ATF3 engines
Type	Turbofan
National origin	United States
Manufacturer	Garrett AiResearch Honeywell Aerospace
First run	May 1968
Major applications	Dassault Falcon 20G Dassault Falcon 200 Dassault HU-25 Guardian
Number built	200+

The Garrett ATF3 (US military designation F104) is a 3-spool turbofan engine developed at the California division of Garrett AiResearch. Due to mergers it is currently supported by Honeywell Aerospace. The engine's design is unusual; the core flow path is reversed twice. Aft of the fan, the axial compressor has five stages, after which the gas path progresses to the aft end of the engine. There, it is reversed to flow through a centrifugal compressor stage, the combustors and then the turbine stages. Beyond this, the flow is then reversed again to exit through the fan bypass duct. All engine accessories are mounted on the aft end of the engine under an engine tail-cone.^[1]