What action should be taken if a message is received that is not understood?

The appropriate action to take when receiving a message that is not understood is to request clarification from the sender. This is crucial in ensuring effective communication and avoiding misunderstandings, especially in aviation and telecommunications where precision is vital. Seeking clarification allows for the sender to explain their message more clearly, which can prevent potential safety risks that might arise from misinterpretation.

Ignoring the message could result in missing critical information, while making assumptions about its content can lead to incorrect responses or actions. Waiting for the message to be retransmitted might also be ineffective if the original communication was unclear. Asking the sender directly fosters clarity and maintains the integrity of the communication process, ensuring that all parties have a shared understanding.