Answer / Sheshmani Saroj

400 Hz is used in the aviation industry due to historical reasons, as well as practical considerations. It was chosen as a standard frequency because it allows for effective filtering and minimizes interference with other systems.

For flight instruments, 400 Hz is used because it provides a stable and easily discernible vibration that pilots can feel during instrument flights. This helps them maintain proper orientation and control of the aircraft.

In radio transmission systems, 400 Hz is often used as a reference frequency for modulation and demodulation purposes. It allows for clear and reliable communication between ground controllers and aircraft.

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