Short description: High bypass turbofan aircraft engine
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CF34 engine mounted on an Embraer 190.Recent versions of the CF34 feature chevrons on the core nozzle outlet.
The General Electric CF34 is a civilian high-bypassturbofan developed by GE Aviation from its TF34 military engine. The CF34 is used on a number of business and regional jets, including the Bombardier CRJ series, the Embraer E-Jets, and ComacARJ21/C909.[1][2] There are 7,500 engines in service.[3]
The original engine contained a single stage fan driven by a 4-stage low pressure (LP) turbine, supercharging a 14-stage high pressure (HP) compressor driven by a 2-stage HP turbine, with an annular combustor. Later higher thrust versions of the CF34 feature an advanced technology core, with only 10 HP compressor stages. Latest variants, the -10A and -10E, were derived from the CFM56 engine family, and have a radically different HP spool, containing a 9-stage compressor driven by a single stage turbine. The LP spool has 3 core booster stages behind the fan. Static thrust is 82 kilonewtons (18,500 lbf) for the -10E variant.
On wing times can reach 14,000 hours, an overhaul costs over $1.5 million and a set of LLPs $2.1 million for a 25,000 cycle life.[4]
In 1995, GE invested $200 million to develop the -8C derivative for the CRJ700.[5]
In a 2020 solicitation by the US Air Force called the B-52 Commercial Engine Replacement Program, GE had proposed updating the Boeing B-52 Stratofortress with CF34-10 engines.[6] In September 2021, the Rolls-Royce F130 was selected instead of the GE proposal.[7]
