From the video, it looks like they activated the aircraft&#x27;s ELT, which is the aircraft version of a PLB. Same system, just integrated into the aircraft and designed to automatically activate in a crash.<p>At the time that video was recorded (1989), ELTs were analog-only... nowhere near as accurate, and very prone to false alarms.<p>The new 406 MHz digital beacons are much more accurate. :)