Article · Wikipedia archive · Last revised Jun 4, 2026

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/C909. There are 7,500 engines in service.

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Jun 4, 2026
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CF34
A CF34 installed on a Bombardier CRJ200
TypeTurbofan
National originUnited States
ManufacturerGE Aviation
First run19821
Major applicationsBombardier CRJ
Comac C909
Embraer E-Jets
Developed fromGeneral Electric TF34
Developed intoGeneral Electric Passport
CF34 engine mounted on an Embraer 190. source ↗
Recent versions of the CF34 feature chevrons on the core nozzle outlet. source ↗

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/C909.23 There are 7,500 engines in service.4

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 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.5 In 1995, GE invested $200 million to develop the -8C derivative for the CRJ700.6

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.7 In September 2021, the Rolls-Royce F130 was selected instead of the GE proposal.8

Applications

CF34-1A

CF34-3

CF34-3A

CF34-3B

CF34-8

CF34-8C

CF34-8E

CF34-10

CF34-10A

CF34-10A powering the Comac C909 source ↗

CF34-10E

Specifications

CF34 Engine Comparison9
CF34-310 CF34-8C11 CF34-8E12 CF34-10A13 CF34-10E14
Application CL600/CRJ200 CRJ700/900/1000 E170/175 C909 E190/195
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)
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)
Fan 44 in (110 cm) 46.2 in (117 cm) 53 in (130 cm)
Compressor 14 HP stages, 14:1 10 HP stages 3 LP + 9 HP stages
Turbine 4 LP + 2 HP stages 4 LP + 1 HP stage
Thrust (SL) 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)
Thrust/weight 5.52:1 5.7-6:1 5.6:1 5.1:1 5.2:1
OPR (max. power) 21:1 28-28.5:1 28.5:1 29:1
Bypass ratio 6.2:1 5:1 5.4:1
SFC (Cruise) 0.69 lb/lbf/h
(20 g/kN/s) 		0.67–0.68 lb/lbf/h
(19–19 g/kN/s) 		0.68 lb/lbf/h
(19 g/kN/s) 		0.65 lb/lbf/h
(18 g/kN/s) 		0.64 lb/lbf/h
(18 g/kN/s)
See also

See also

Related development

Comparable engines

Related lists

References

References

  1. GE Aviation at flightglobal.com
  2. The CF34 Archived 2022-05-29 at the Wayback Machine at aviationpros.com
  3. GE's CF34-3 Engines Celebrate 20 Years of Regional Jet Service Archived 2022-05-29 at the Wayback Machine at aviationpros.com
  4. https://www.geaerospace.com/commercial/aircraft-engines/cf34
  5. "E190 Values Start to Take Note of E2". Aircraft Value News. October 29, 2018.
  6. David Hughes (Feb 13, 1995). "CF34-8C to power new regional jet". Aviation Week.
  7. "Propulsion Hub & Engine Product | GE Aviation". Archived from the original on June 26, 2020. Retrieved June 25, 2020.
  8. "Rolls-Royce North America selected to power the B-52 Commercial Engine Replacement Program". Retrieved July 21, 2023.
  9. "The CF34 Engine". GE Aviation.
  10. "CF34-3 turbofan engine" (PDF). GE Aviation.
  11. "CF34-8C turbofan engine" (PDF). GE Aviation.
  12. "CF34-8E turbofan engine" (PDF). GE Aviation.
  13. "CF34-10A turbofan engine" (PDF). GE Aviation.
  14. "CF34-10E turbofan engine" (PDF). GE Aviation.
External links