Gas Turbine Engine Components

Engine Architecture

• The T700 GE 701D EDECU engine is a front drive turboshaft engine with a modular construction.
• The engine is divided into four modules: cold section, hot section, power turbine section, and accessory section.

Cold Section

• The cold section includes the main frame, diffuser and mid frame assembly, inlet particle separator, compressor, output shaft assembly, and associated components.
• The compressor has five axial stages and one centrifugal stage.
• There are variable inlet guide vanes and variable stage 1 and 2 stator vanes.

Hot Section

• The hot section module consists of three subassemblies: the gas generator turbine (NG), stage 1 nozzle assembly, and annular combustion liner.

Power Turbine Section

• The power turbine module includes a two-stage power turbine (NP) and exhaust frame.
• Mounted on the power turbine module are the thermocouple harness, the torque and overspeed sensor, and the NP sensor.

Accessory Section

• The accessory section module includes the top-mounted accessory gearbox.
• Components mounted on the cold section module include the Enhanced Digital Electronic Control Unit (EDECU), history recorder/history counter, ignition system, and electrical cables.

Fuselage

• The fuselage includes a forward, center, and aft section.
• The forward fuselage section contains a portion of the Extended Forward Avionics Bays (EFAB), and the CPG station.
• The center fuselage contains a portion of the EFAB, the pilot station, and provides support for the main landing gear, main transmission, wings, fuel cells, and ammunition bay.
• The aft fuselage section includes the vertical stabilizer and mounts the tail landing gear.

Rotors

• The helicopter has a fully articulated four-blade main rotor system equipped with elastomeric lead-lag dampers.
• The tail rotor is a semi-rigid design and consists of four blades.

Engines and Power Transmission

• The helicopter is powered by two turboshaft engines.
• Power is supplied to the main transmission through engine-mounted nose gearboxes, shafts, and over-running clutches.
• The main transmission drives the main and tail rotors and accessory gearbox.

Wings

• Left and right wings are attached to the center fuselage.
• Each wing provides two hard points for external stores pylons with hydraulic and electrical quick-disconnects.
• Wing tip pylons are installed on the outboard portion of each wing for mounting the ATA launchers.

Special Mission Kits

• The helicopter can be equipped with various kits, including Longbow Fire Control Radar (FCR), Winterization, Extended Range Fuel System, Air to Air to Ground (AAG), Link 16, and Upper Receiver (UR).