Black Box in flight

Subject: Science & Technology

Context: Black boxes located at Indonesian airliner crash site as human remains recovered.

Concept:

It is also called flight data recorder or cockpit voice recorder and it stores data about planes.
They reveal information which leads to information about the accidents of flight.
There are two different flight recorder devices the flight data recorder (FDR) preserves the recent history of the sounds in the cockpit, including the conversation of the pilots.
These can also be combined into a single unit.
These boxes are of a size of a shoe.
It is compulsory on every commercial flight or corporate jet, and are mostly on tail of aircraft.
FDR records airspeed, altitude, vertical acceleration and fuel flow and can store data of 25 hours.
The CVR records the conversation between the pilots as well as with air travel control tower.
Once black box crashes into water, the beacon sends out an ultrasonic pulse that is detectable by sonar and audio equipment to depths to approximately 14000 feet.
These black boxes are of fluorescent flame-orange (makes it more visible) in colour and not black and was used for the first time during World War 2 with the development of radio, radar and electronic navigations.