General Electric CF34



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. In 2012, there were 5,600 engines in service.

Design and development
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 18500 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. 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.

Applications

 * CF34-1A
 * Bombardier Challenger 601-1A
 * CF34-3A
 * Bombardier Challenger 601-3A/3R
 * Bombardier CRJ100
 * CF34-3B
 * Bombardier Challenger 604
 * Bombardier Challenger 605
 * Bombardier Challenger 650
 * Bombardier Challenger 850
 * Bombardier CRJ200
 * Bombardier CRJ440
 * CF34-8C
 * Bombardier CRJ550
 * Bombardier CRJ700
 * Bombardier CRJ705
 * Bombardier CRJ900
 * Bombardier CRJ1000
 * CF34-8E
 * Embraer 170
 * Embraer 175
 * CF34-10A
 * Comac ARJ21
 * CF34-10E
 * Embraer 190
 * Embraer 195
 * Embraer Lineage 1000