General Electric CF34
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|A CF34 installed on a Bombardier CRJ200|
|National origin||United States|
|Major applications||Bombardier Challenger 601/604/605|
Bombardier Challenger 850
|Unit cost||CF34-8C5: US$4 million (2012) |
CF34-10E: US$7.3 Million (2012) 
|Developed from||General Electric TF34|
|Developed into||General Electric NG34|
The General Electric CF34 is a civilian high-bypass turbofan developed by GE Aircraft Engines 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 the Chinese ARJ21. As of 2012, there are over 5,600 engines in service.
Design and development
The original engines comprise a single stage fan, driven by a 4-stage low pressure (LP) turbine, supercharging a 14-stage HP compressor, driven by a 2-stage high pressure (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, comprising 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. In 1995, GE invested $200 million to develop the -8C derivative for the CRJ700.
|Bombardier CRJ700/900/1000||E-170/175||Comac ARJ21||E-190/195|
|Length||103 in (2.6 m)||128 in (3.3 m)||121 in (3.1 m)||90 in (2.3 m)||145 in (3.7 m)|
|Diameter||49 in (1.2 m)||52 in (1.3 m)||53 in (1.3 m)||57 in (1.4 m)||57 in (1.4 m)|
|Dry weight||1,670 lb (760 kg)||2,400–2,450 lb (1,090–1,110 kg)||2,600 lb (1,200 kg)||3,700 lb (1,700 kg)||3,700 lb (1,700 kg)|
|Compressor||1 44 in fan
14 HP stages, 14:1
|1 46.2 in fan
10 HP stages
|1 53 in fan + 3 LP stages|
9 HP stages
|Turbine||4 LP stages
2 HP stages
|4 LP stages|
1 HP stage
at sea level
|9,220 lbf (41.0 kN)||13,790–14,500 lbf (61.3–64.5 kN)||14,500 lbf (64 kN)||17,640 lbf (78.5 kN)||20,360 lbf (90.6 kN)|
|Overall pressure ratio
at max. power
|Cruise SFC||0.69 lb/lbf/h (70 kg/kN/h)||0.67–0.68 lb/lbf/h (19–19 g/kN/s)||0.68 lb/lbf/h (69 kg/kN/h)||0.65 lb/lbf/h (66 kg/kN/h)||0.64 lb/lbf/h (18 g/kN/s)|
- PowerJet SaM146
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- GE Aviation at flightglobal.com
- Technology Development Continues for Next-Generation Turbofan and Turboprop Engines at geaviation.com
- The CF34 at aviationpros.com
- GE's CF34-3 Engines Celebrate 20 Years of Regional Jet Service at aviationpros.com
- "E190 Values Start to Take Note of E2". Aircraft Value News. October 29, 2018.
- David Hughes (Feb 13, 1995). "CF34-8C to power new regional jet". Aviation Week.
- "The CF34 Engine". GE Aviation.
- "CF34-3 turbofan engine" (PDF). GE Aviation.
- "CF34-8C turbofan engine" (PDF). GE Aviation.
- "CF34-8E turbofan engine" (PDF). GE Aviation.
- "CF34-10A turbofan engine" (PDF). GE Aviation.
- "CF34-10E turbofan engine" (PDF). GE Aviation.
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