The General Electric CF34 is a civilian high-bypass turbofan 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 Comac ARJ21/C909. There are 7,500 engines in service.
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 and , 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 for the 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. In 1995, GE invested $200 million to develop the -8C derivative for the CRJ700.
GE had proposed updating the Boeing B-52 Stratofortress with CF34-10 engines, but the Rolls-Royce F130 was selected in September 2021 instead.