What action should be taken if RADAR fails calibration checks?

The appropriate action when RADAR fails calibration checks is to immediately refrain from using the device and obtain repairs or replacements, which aligns with the selected answer. Calibration checks are crucial to ensure the device operates within specified parameters for accuracy and reliability. A failure in these checks indicates that the system may provide incorrect data, which can lead to serious safety risks or operational errors, especially in high-stakes environments such as aviation or maritime operations.

By not using the device and seeking immediate repairs or professional assessment, you prioritize safety and operational integrity. Continuing to use the RADAR system despite calibration failures could compromise the effectiveness of the measurements and potentially lead to hazardous situations. Therefore, halting usage until the device is properly recalibrated is essential for maintaining operational standards and safety protocols.