By listening to the ambient sounds in the cockpit before a crash, experts can determine if a stall took place, the RPMs of the engine, and the speed at which the plane was traveling.When these sounds are cross-referenced with ground control conversations, they can even help searchers locate a crash site.Then, there`s the flight data recorder. It gathers 25 hours of technical data from airplane sensors, recording several thousand discreet pieces of information.
Could you please define cross-referenced and ground control conversation in simple English.