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.The CF34 at aviationpros.comGE's CF34-3 Engines Celebrate 20 Years of Regional Jet Service at aviationpros.com There are 7,500 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 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.

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. In September 2021, the Rolls-Royce F130 was selected instead of the GE proposal.

Applications

CF34-1A Bombardier Challenger 601-1A

CF34-3

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

CF34-8

CF34-8C Bombardier CRJ550 Bombardier CRJ700 Bombardier CRJ705 Bombardier CRJ900 Bombardier CRJ1000

CF34-8E Embraer 170 Embraer 175

CF34-10

CF34-10A

Comac C909

CF34-10E Embraer 190 Embraer 195 Embraer Lineage 1000

Specifications

+ CF34 Engine ComparisonCF34-3CF34-8CCF34-8ECF34-10ACF34-10EApplicationCL600/CRJ200CRJ700/900/1000E170/175C909E190/195LengthDiameterDry weight Fan Compressor14 stages, 14:110 HP stages3 + 9 stagesTurbine4 + 2 stages4 LP + 1 HP stageThrust (SL)Thrust/weight5.52:15.7–6:15.6:15.1:15.2:1 OPR (max. power)21:128–28.5:128.5:129:1Bypass ratio6.2:15:15.4:1SFC (Cruise)

See also

References

External links

General Electric CF34 page