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Answer :
Final answer:
Beta mode in a propeller is activated when the power lever is pulled back past the flight idle stop. An RPM decrease ensues, but specifying an exact percentage would be inaccurate without referring to a specific aircraft make and model. Always consult the aircraft's operating manual for accurate information.
Explanation:
Beta mode is a specific operating mode of a propeller in a turboprop engine, used in ground operations such as taxiing, reversing, etc. In beta mode, the propeller blades' pitch is controlled by the power lever instead of the propeller governor. The statement 'the propeller control is in beta mode' can be indicated variously by cockpit instruments, depending on the specific design of the aircraft.
However, the decisive indication is not necessarily a specific propeller RPM percentage. It might be misleading to state that any of the provided percentages (below flight idle, 80%, 50%, or 30%) necessarily indicate beta mode. Instead, beta mode is usually activated when the power lever is pulled back past the flight idle stop. This results in a decrease in RPM, but the specific percentage can vary based on many factors such as engine condition, model, etc.
Therefore, it's not appropriate to single out only one of the statements as completely correct without referring to a specific make and model of aircraft. It's crucial to consult the aircraft's operating manual for the most accurate information.
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