In the normal start sequence when the starter push button is depressed, the starter will drive:

In the normal start sequence when the starter push button is depressed, the starter will drive:

• A. The RGB
• B. The power turbine
• C. The freewheeling unit
• D. The compressor / gas generator turbine

Answer: (D)

When the starter push button is depressed, the correct action in the normal start sequence is for the starter to drive the compressor and gas generator turbine. This initial phase is crucial for establishing the necessary airflow and conditions for combustion within the engine. During the start sequence, when the starter engages, it turns the compressor, which takes in air and pressurizes it. This pressurized air is then directed into the combustion chamber where fuel is added, leading to ignition and the eventual startup of the gas generator turbine. The gas generator turbine then generates the power needed for operation of the rotor system. Other components, like the RGB (reduction gearbox), the power turbine, and the freewheeling unit, have different roles and are not directly driven by the starter during this initial process. Instead, they operate based on the energy produced once the gas generator is running and delivers the necessary power for the rotor systems and other functionalities of the helicopter. Thus, the emphasis on the relationship between the starter and the compressor emphasizes the appropriate role that the starter plays in the engine start-up process.

When the starter push button is depressed, the correct action in the normal start sequence is for the starter to drive the compressor and gas generator turbine. This initial phase is crucial for establishing the necessary airflow and conditions for combustion within the engine.

During the start sequence, when the starter engages, it turns the compressor, which takes in air and pressurizes it. This pressurized air is then directed into the combustion chamber where fuel is added, leading to ignition and the eventual startup of the gas generator turbine. The gas generator turbine then generates the power needed for operation of the rotor system.

Other components, like the RGB (reduction gearbox), the power turbine, and the freewheeling unit, have different roles and are not directly driven by the starter during this initial process. Instead, they operate based on the energy produced once the gas generator is running and delivers the necessary power for the rotor systems and other functionalities of the helicopter. Thus, the emphasis on the relationship between the starter and the compressor emphasizes the appropriate role that the starter plays in the engine start-up process.