Any commercial aeroplane or corporate jet is required to be equipped with a cockpit voice recorder and a flight data recorder. It is these two items of separate equipment which we commonly refer to as a ‘Black Box.’ While they do nothing to help the plane when it is in the air, both these pieces of equipment are vitally important should the plane crash, as they help crash investigators find out what happened just before the crash. An aircraft's Black Box is in fact orange and, depending on the plane, there may be two of them. The box, or boxes, record two streams of data. There is the Cockpit Voice Recorders (CVR) and Flight Data Recorders (FDR). the Black Box is still just as vitally important in helping piece together the causes of a plane crash. To help locate the cockpit voice recorder and a flight data recorder in the aftermath of a plane crash that occurs at sea, each recorder has a device fitted to it known as an Underwater Locator Beacon (ULB). The device is activated as soon as the recorder comes into contact with water and it can transmit from a depth as deep as 14,000 feet. Also, to help investigators find them; a Black Box is not actually black at all, but bright orange.
Today's recorders are made to withstand brutal sudden impacts, intense fire temperatures, and the crushing pressures of deep ocean depths. each recorder has a Underwater Locator Beacon (ULB) that transmits a signal at 37.5 KHz so the box can be found if it is submersed in water. The Federal Aviation Authority (FAA) requires most commercial aircraft (those flying paying passengers) and many private and corporate aircraft to have functioning CVRs and FDRs on board.
The Cockpit Voice Recorder records not just voices but all the sounds made within the cockpit. By listening to conversations between people on the flight deck and conversations between the flight crew and cabin crew, ground crew, airport tower, and Air Traffic Control, investigators can determine what the