TF34
Type	Turbofan
National origin	United States
Manufacturer	General Electric
First run	1971
Major applications	A-10 Thunderbolt II S-3 Viking
Variants	General Electric CF34

The General Electric TF34 is an American military turbofan engine used on the A-10 Thunderbolt II, S-3 Viking and RQ-170 Sentinel.

Design and development

Developed by GE Aircraft Engines during the late 1960s, the original engine comprises 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. An annular combustor is featured. The TF34-GE-400A is rated at 9,275 lbf (41.26 kN) static thrust.

The civilian variant, the CF34, is used on a number of business and regional jets.

Variants

TF34-GE-2

Initial variant for Lockheed S-3, entered production in August 1972.

TF34-GE-100

Variant for Fairchild A-10A, first flown in A-10 during May 1972. Production began in October 1974.

TF34-GE-400A

Improved version of GE-2 for Lockheed S-3.

Applications

• Fairchild Republic A-10 Thunderbolt II
• Lockheed S-3 Viking
• Lockheed Martin RQ-170 Sentinel
• Sikorsky S-72

Specifications (TF34-GE-400A)

Data from Jane's.^[1]

General characteristics

• Type: Twin-shaft, high-bypass turbofan engine
• Length: 100 in (250 cm)
• Diameter: 52.2 in (133 cm)
• Dry weight: 1,478 lb (670 kg)

Components

• Compressor: Single-stage fan, 14 stage HP axial compressor
• Combustors: Axial, annular
• Turbine: 4 stage LP, 2 stage HP

Performance

• Maximum thrust: 9,275 lbf (41 kN; 4,207 kgf)
• Specific fuel consumption: 0.363 lb/(h·lbf) (10.3 mg/Ns)
• Thrust-to-weight ratio: 6.28