Recently Andhra Pradesh chief minister Y S Rajasekhara Reddy died in a flight crash. The experts said that he didn't dead upto 9 minutes after the crash. Have you ever imagined how the experts able to know this? This is all possbile by using a small instrument called Black Box.

Funny thing about black box is that, it is not in black colour. It is in orange colour.It is very strong. It will not break nad can withstand in any conditions. If it fallen from so much height, then also it will be safe. It can withstand in high temparatures.

This instrument is compulsory fitted in helicophters and in aeroplanes. It can record data upto some hours. It can record small sound also. If a pilot presses any key, that key sound also be recorded.

It has mainly two parts. They are 1. Flight Data Recorder(FDR), 2. Cockpit Voice Recorder. Flight data recorder records the information that the flight is at which height from the ground, direction, wind speed etc. Cockpit voice recorder records every sound. Experts observe all this data and analyses how the accident is happened. So experts first look for this instrument.

Unfortunately if it is drained in water, then it can send ultrasonic waves immediately for informing accident is occured. All the sensors which are connected with black box are fitted at different places inside the flight. For example, cockpit voice recoder is connected with different microphones. This mircophones records every sound.

Before the invention of black box, magnetic tapes are used for this recording purpose. This black box is invented by Australian scientist  David Waren in 1953