Commercial Pilot License (CPL) Practice Exam 2025 - Free Commercial Pilot License Practice Questions and Study Guide

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How can a pilot determine if their aircraft has a Mode C transponder?

Check the aircraft’s maintenance log

Review the current weight and balance equipment list

The determination of whether an aircraft is equipped with a Mode C transponder can be effectively made by reviewing the aircraft's maintenance log. The maintenance log contains detailed records of all equipment installed on the aircraft, including any transponders. It would specify if a Mode C transponder has been installed and whether it is compliant with the necessary regulations for the airspace where the aircraft operates.

The maintenance log is an official record that provides insight into the modifications and equipment history of the aircraft, ensuring that pilots have access to accurate information about their onboard systems. Thus, this documentation is a reliable source for verifying the presence of a Mode C capability, which is essential for properly navigating controlled airspace and interfacing with air traffic control requirements.

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Inspect the cockpit for transponder equipment

Verify with air traffic control

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