What should be added at the end of every transmission if the radio is non-functional?

The inclusion of "Transmission Blind" at the end of every transmission when the radio is non-functional is vital for ensuring clarity and safety in communication. This phrase indicates to other pilots and air traffic control that the sender is unable to receive any responses or acknowledgments to their transmission. By stating "Transmission Blind," the pilot communicates that they are transmitting their message without the ability to hear replies, which can alert others to the potential seriousness of the situation.

In aviation communication, it’s crucial to maintain awareness and understanding among all parties involved, especially in instances of radio failure. The use of appropriate terminology can convey the current status of the aircraft and its pilot, ensuring that surrounding aircraft maintain situational awareness.

The other options suggest urgency or broadcasted communications but do not specifically instruct others on the sender's inability to receive responses. "Mayday" indicates an imminent danger and is used for emergency situations requiring immediate assistance. "All Stations" would imply a general broadcast directed to all listeners, which is unnecessary when the intention is to indicate a non-functional radio. "Urgent Message" may be relevant in a scenario needing immediate attention but does not specifically denote that the sender cannot hear replies. Therefore, "Transmission Blind" is the most appropriate choice to convey the