1 INTRODUCTION TO A SINGLE-SHAFT TURBOPROP ENGINE This section describes the components, component assemblies, systems and operation of a typical single shaft turbopropeller engine. This engine is rated approximately 4900 E.S.H.P. at Standard Day conditions at 100% RPM and a maximum turbine inlet temperature of over 1050 C. The engine consists of a power section, a reduction gear, and a torquemeter assembly. The propeller is mounted on a single rotation propeller shaft. The following definitions apply to this engine. FRONT: The propeller end. REAR: The exhaust end. TOP: Determined by the breather located at the forward end of the power section. BOTTOM: Determined by the power section accessory drive housing, w hich is located at the forward end of the power section. RIGHT AND LEFT: Determined by standing at the rear of the engine, facing forward. ROTATION: The direction of rotation is determined when standing at the rear of the engine, facing forward. The power section rotors rotate in a counterclockwise direction. The propeller rotation is clockwise. ACCESSORIES ROTATION: Determined by facing the mounting pad of each accessory. COMBUSTION LINER NUMBERING: The combustion liners are numbered from one through six in a clockwise direction when viewing the engine from the rear. COMPRESSOR AND TURBINE STAGES NUMBERING: Numbered beginning from the front of the power section toward the rear. MAIN ROTOR BEARINGS: The main rotor bearings of the power section are the front compressor rotor bearing, the rear compressor rotor bearing, the front turbine rotor bearing, and the rear turbine rotor bearing. The bearings are numbered one through four. In addition to these main rotor bearings, there is a compressor extension shaft bearing. SPARK IGNITER LOCATION: Two spark igniters are used. These are located in combustion liners numbers two and five.

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