What indicates that the ELT is transmitting?

The indication that the Emergency Locator Transmitter (ELT) is transmitting is represented by the CAS message "ELT ON" along with an external buzzer. This combination provides clear and direct alerts regarding the operational status of the ELT. The CAS message confirms that the system has been activated, and the external buzzer serves as an audible alert, ensuring that the crew is informed of the transmission status.

While visual alerts, cockpit alarms, and flashing lights on the ELT panel may provide additional information regarding the ELT's status, they do not specifically combine the critical elements of both message confirmation and audible signaling, which are key indicators of an active transmission. The CAS message is particularly important as it informs the crew of the situation in a standardized format recognized by the crew's operational protocols. Therefore, this choice effectively encapsulates the most reliable indicators for confirming that the ELT is actively transmitting.