Final answer:
E.L.T. stands for Emergency Locator Transmitter, a device used to transmit a distress signal for an aircraft in distress, facilitating rapid location by search and rescue teams.
Step-by-step explanation:
In the context of an Emergency locator transmitter, E.L.T. stands for Emergency Locator Transmitter. This is a device that gets activated by a crash and sends out a signal to assist search and rescue teams in locating an aircraft in distress. The primary function of an ELT is to transmit a distress signal indicating the location of the aircraft to ensure rapid response in the event of an incident. Modern ELTs typically operate on the 406 MHz frequency, which can be detected by satellites and allows for quick location determination.