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The altimeter and altitude reporting equipment are required to be inspected every 24 calendar months according to regulations. This timeframe is established to ensure that critical flight instruments, which directly affect the safety and performance of the aircraft, are functioning correctly. Regular inspections help maintain accuracy, preventing potential errors that could lead to unsafe flight conditions.

Each inspection involves checking the altimeter for calibration and accuracy, as well as other altitude reporting devices. The 24-month interval is designed to provide a balance between operational safety and the practicality of frequent checks, so pilots can operate their aircraft with confidence knowing their altitude indications are precise.

Other options suggest more frequent inspections, which are not mandated by aviation regulations, while options suggesting less frequent inspections would not meet safety standards. Regular checking at this specified interval ensures compliance with safety regulations and contributes to overall flight safety in commercial operations.