General Electric TF34/CF34

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A CF34 mounted on the #2 pylon of GE's Boeing 747 flight test aircraft at Mojave Airport in 2002.

The General Electric TF34 is a military turbofan engine used on the A-10 Thunderbolt and S-3 Viking. Developed by GE Aircraft Engines during the late 1960s, the original engine comprises a single stage fan, driven by a 4-stage LP turbine, supercharging a 14-stage HP compressor, driven by a 2-stage HP turbine. An annular combustor is featured. The TF34-GE-400A is rated at 41.26KN (9275lbf) static thrust.

The civilian variant, the CF34, is used on a number of jet airliners, including the Bombardier CRJ series, the 'E-Jets' from Embraer and the Chinese ARJ21 under development. Originally based on the TF34, 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 18500lbf (i.e. -10E)

1 Incidents
2 Specifications
3 Applications
4 External links

[edit] Incidents

On January 25, 2007, a Mesa Airlines CRJ-200LR with registration N17337 and operating as US Airways Express (in America West Express colors) flight 2985 from Denver International Airport to Phoenix Sky Harbor International Airport experienced an uncontained failure of its port engine approximate 50 nm (100 km) from Denver.^{[citation needed]} The flight crew declared an emergency and were able to return to Denver without injury to passengers or crew. The incident is the first of its kind for the General Electric CF34-3B1 engine used on the CRJ.^{[citation needed]}

[edit] Specifications

General characteristics

Type: axial flow, twin-shaft, bypass turbofan engine
Length:
Diameter:
Dry weight:

Components

Compressor:

Performance

Power output:
Power-to-weight ratio:

	CF34-3	CF34-8	CF34-10
Length	103 in
Diameter	49 in		57 in
Dry weight	1,625 - 1,670 lb	2,408 - 2,600 lb	3,700 lb
Compressor	1 fan 14 HP stages	1 fan 10 HP stages	1 fan + 3 LP stages 9 HP stages
Turbine	4 LP stages 2 HP stages	4 LP stages 2 HP stages	4 LP stages 1 HP stage
Thrust at sea level	9,220 lb_f	13,790 - 14,510 lb_f	18,285 - 20,000 lb_f
Power-to-weight ratio	5.6:1	5.3:1	5.2:1
Overall pressure ratio at max. power	21:1	28:1 - 28.5:1	29:1
Bypass ratio	6.2:1	5:1	5:1