How often must transponder inspections be conducted?

Transponder inspections are crucial for ensuring the proper functioning of the aircraft's transponder, which is essential for air traffic control communications and safety. According to New Zealand aviation regulations, the frequency for conducting transponder inspections is every 24 months. This timeframe allows for adequate oversight of the transponder's performance and helps ensure that it will operate correctly when required.

The rationale behind the 24-month interval is to balance airworthiness and safety needs with practical maintenance scheduling. Regular inspections within this timeframe help to identify any potential issues before they could affect flight safety while keeping compliance with regulatory standards.

In contrast, options suggesting shorter or longer intervals do not align with the established regulations, making them less appropriate. Adhering to the 24-month inspection requirement ensures that aircraft remain compliant with the necessary aviation protocols and continue to operate safely within New Zealand airspace.