For aircraft following an ICAO procedure, what must be done if the required equipment fails before deployment?

When following an ICAO procedure, notifying the controlling agency without delay is essential if required equipment fails before deployment. This action is critical because the controlling agency needs to be aware of the situation to ensure the safety and efficiency of air traffic. They may need to adjust other flights, provide alternative routing, or give specific instructions to the aircraft that is facing equipment failure.

Communication with the controlling agency facilitates proper coordination and helps mitigate potential hazards associated with the failure of required equipment. It provides essential information that affects not only the aircraft in question but potentially other aircraft in the vicinity as well. This is in line with ICAO regulations that emphasize the importance of maintaining situational awareness and promoting safety through clear communication.

In contrast, simply replacing the equipment immediately may not be feasible, especially in-flight. Continuing the flight without informing the controlling agency could lead to increased risk, as they may not be able to provide necessary support or adjustments. Monitoring the system and reporting anomalies is an important procedure but does not replace the necessity of immediate notification to ensure comprehensive safety measures are enacted.