What is the black box in an airplane crash
What is the black box in an airplane crash, the black box everyone should have heard of, although the probability of aircraft accidents is the lowest of all modes of transportation, but it is also the mortality rate is also the highest, the accident may be small once the accident occurs, the following to understand the black box of the plane crash is what.
What is an airplane crash black box 1"Black box" is a polysemous word, the physical term black box refers to the machine that does not understand how it works. In real life, there are many things that can be called a black box, such as a computer, which is a black box in every sense of the word, because the average person does not understand what the internal workings of a computer are.
And this article to say the black box, is the airplane black box. Just like the car's driving recorder, the black box is an instrument specifically designed to record the flight and performance parameters of the aircraft.
The black box was invented by Dr. David Warren, a Melbourne native, in 1958. 1908, the first military aircraft accident occurred in the United States, and since then, flight accidents continue to occur, and after a flight accident, the probability that the aircraft will be disintegrated, and the survival rate of the people inside the aircraft is extremely low, so there is a pressing need for a way to remember the process of accidents and the reasons for the instrument, the black box is born in this context. The black box was born in this context.
In the early days of its existence, the black box was truly a "black" box, when all the electronic equipment in the airplane was placed in a black box of uniform shape and size. But the development to the present, the black box is not black, but orange or orange-red, because this color is more eye-catching, easy to find at night, for which some of the black box surface is also affixed with a reflective logo.
In addition to the color, the current black box shape is not the previous square box, like a streamlined container, is a sealed container, the size of an ordinary drawer 1/4 ~ 1/3 so big.
Since it is not black, the shape is not like a box, why still call it a black box today? This is a matter of habit, "black box" this name seems to have a sense of mystery, it stores the data is very critical and mysterious, in addition, in some flight accidents, it may also go through the fire to become black, so it is still called the black box.
We already know what the black box is, then why the airplane crash, the first time to find the black box? In fact, as mentioned earlier, the black box is known as the air disaster "witness", it can give investigators evidence to help them understand the truth of the accident, in order to give the family a reasonable statement, but also as a foregone conclusion for the "car" to prevent.
The black box is a transceiver, which can receive all kinds of information collected by in-flight sensors during the flight, and convert this information into digital signals for continuous recording. Once the plane crashes, the black box will automatically transmit a specific frequency of radio signals in all directions, "announcing" where they are located, so that searchers can trace the wave to find.
Currently, there are two types of black boxes installed on most airliners and military airplanes, one is called the "aircraft data recorder (FDR)", and the other is called the "pilot's language recorder (CVR)", and the other is called the "pilot's language recorder (CVR)".
The FDRs are called FDRs and the CVRs are called CVRs.
FDR is specifically responsible for recording all kinds of data during the flight of the aircraft, and can record a cumulative total of 25 hours, **** more than 30 kinds of data, such as engine speed, temperature, aircraft rudder deflection, flight altitude and speed and so on. If the unfortunate occurrence of air accidents, the entire accident process of flight parameters can be found from the black box, so as to inform people of the cause of the plane crash.
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CVR is like a tape recorder, it can be installed in the cockpit and cockpit speakers, recording a variety of speech, such as the sound of pilots talking to each other, the sound of passengers talking to each other, the hijackers and the air hostesses of the speech, etc., can be recorded for 30 minutes, and if it is more than 30 minutes, it will be re-recorded. Therefore, the CVR black box records the important information in the airplane 30 minutes before the crash.
Since the black box is so important, is it possible that the black box was damaged in the accident? Yes, but it's less likely, and the designers certainly took that into account.
First of all, the black box is specially made of alloy material, very strong, can withstand high temperatures of 600 to 800 ℃, can withstand 1 ton of high pressure, in addition to corrosion; Second, in order to facilitate the recovery of the black box, the black box on the placement of parachutes, when up to a certain limit of the safety of the landing of the automatic pop-up; furthermore, in order to ensure the safety of the aircraft, it is usually installed in a place far away from the center of the tail wing root.
The black box can be used for a variety of purposes.
For the black box this special "witness", aircraft designers on it is doubly cared for.
What is the black box of an airplane crash2
What is the black box of an airplane crash
Air crashes have recently become an epidemic around the world, with many countries and regions experiencing tragedies of airplane crashes one after another. People are concerned about the rescue of survivors and recovery of the bodies of victims at the same time, but also concerned about an instrument - black box, because the black box can tell us why the plane crashed.
The black box, which is used as a "witness" to the flight conditions of an airplane, is not actually black, but is often orange-red. It is called a "black box" because it can help decipher the secrets of a flight accident (especially the conditions of the airplane at the moment of the crash and the period of time before the crash).
The black box shell is solid, rectangular, about the same as four or five bricks together generally large. The internal net is some electrical devices, essentially a transceiver. In the aircraft flight process, it will be able to aircraft sensors collected a variety of information received in a timely manner, and automatically converted into the corresponding digital signal continuous recording; when the aircraft crash,
rely on the black box of the emergency locator transmitter automatically in all directions to send out a specific frequency (for example, 37.5 kilohertz), similar to heartbeat regular radio signals, "announced" their own. Because of the limited capacity of the battery inside the box, the localization transmitter usually can only work continuously for a few months. If the salvage is not timely, the black box will disappear.
On each airplane, there are usually two black boxes, their scientific name is called "flight data recorder" and "cabin voice recorder". The former mainly records a variety of aircraft flight data, including flight attitude, flight track (trajectory), flight speed, acceleration, latitude and longitude, heading, as well as the role of the aircraft on a variety of external forces, such as drag, lift, thrust, etc., **** about more than 200 kinds of data can be retained for more than 20 hours of flight parameters.
Beyond this time, the data recorder automatically spits out the old data and the old data is overwritten by the new data. The cabin voice recorder mainly records the calls between the crew and ground personnel, the conversations between the crew, and the various sounds that occur in the cockpit (including the sound of the airplane engine running), and so on.
Its working principle is similar to that of an ordinary tape recorder, where the tape runs over and over again, washing the old and recording the new, always recording the last half hour of various sounds. A flight usually go through eight stages (takeoff, initial climb, climb, cruise, descent, start approach, final approach, landing), each stage of the situation, are aimed at the black box "ears".
Why is the black box theoretically able to be found in an airplane crash?
Why is the black box theoretically able to be found?
Because the black box was originally invented to determine the cause of aircraft failure! Most of us may not know enough about the black box, but those who drive must have seen the car recorder, you can think of the black box as the airplane's car recorder! Although the black box is called black box, but it is not a small one!
The shape of the black box is about as big as 4/5 bricks! And the black box isn't black, it's a bright 'orange' color! This is also designed to make the black box easy to find after an accident!
Some people may say that the black box is still intact after the plane crashed and burned? Of course! The black box is placed in the safest part of the tail of the whole airplane! In the 1100 ℃ extreme high temperature flame can withstand 30 minutes! It's also able to withstand the crushing of a 2-ton weight! Batteries, acid, gasoline, and alcohol for months!
Even if the airplane is damaged, the information from the black box will not be damaged! This is why most people are in a hurry to find the black box after an airplane crash! Because the black box can determine the real cause of the accident! It can completely solve the root cause of why the airplane actually crashed!
The black box can't be found, which means that the cause of the crash can only be speculated on, and no definitive conclusion can be drawn.
There was also a tragedy at Guilin airport more than 20 years ago! A plane that was flying well suddenly crushed disintegration, the total weight of 42 tons of aircraft, more than 1,600 people looking for day and night, but also found only 2 tons of aircraft wreckage! The black box, which can determine the cause of the accident, can not be found in any case!
That plane, a Boeing 737-300, which is the second year of the Boeing 737 this series of airplanes put into use. Experts can only speculate from the last wreckage to
What happened at that time, and it turned out that the plane was actually swooping down to the cliff in an almost vertical way, what happened here?
Some people, because of the air accidents that always happen in Guangxi, classify the local neighborhood as "China's Bermuda", and try to persuade the public with magical and mysterious theories, but they forget that the truth is hidden in the black box.
The truth is material, not spiritual speculation!
Perhaps there are mysterious forces in the world, but heaven and earth are not kind to all things as ruminants, so we can ignore them and not to seek a truth and justice?
Those who died, those who lived, the captains and flight attendants who died at the last minute, don't they deserve an answer?
The truth about Malaysia Airlines is not yet clear, and the black box has been missing. The truth is hidden in the black box, and the relatives can't wait for their families.
Hopefully, this time the black box can be found as soon as possible! After all, the living need a truth! Knowing the truth can also give the dead an explanation!
How to save yourself in an airplane accident?
If, unfortunately, an airplane crash occurs, what should an individual do? In fact, everyone does not want to encounter such a situation, but the world is not afraid of ten thousand, afraid of the eventuality. So it's very, very important to be prepared!
Coupled with the fact that airfares are getting cheaper and cheaper nowadays, traveling by plane is becoming more and more common, not to say that you will definitely run into problems when you fly, but if you do, then the mortality rate of airplanes is very high. So, be sure to look at the following a few notes in advance!
Don't wear slippers and high heels when traveling by plane! Some people may feel that the airplane is a rest time, so just wear slippers more convenient, but slippers are as bad as high heels in a critical situation is not conducive to escape!
After getting on the plane, the flight attendants usually demonstrate the use of first aid kits, so don't be distracted, and be sure to check them carefully and memorize them. The reason for this is that when something happens, the flight attendants are not always available to take care of everyone!
According to the survey report:
When an airplane is on fire, passengers sitting in the front of the cabin have a 65% chance of escaping; passengers sitting in the back of the cabin have a 53% chance of escaping. Passengers sitting in the aisle seats have a 64% chance of survival, while those in other seats have a 58% chance of escape
So, when choosing a seat on an airplane, we can prioritize the seats that are in front of us and by the aisle.
Many people like to sit by the window of the airplane, this is because the window can look at the scenery, the field of view is better, but the choice of the window position in the danger of escape is not so dominant. After all, in the moment of danger, everyone is panicked, all thinking to rush out, is bound to cause congestion.
When the plane crashes and burns, it is likely to release toxic gases, and this time passengers must avoid inhaling these gases, and can take a towel or wet wipes to cover their mouths and noses.
Before flying, it is still necessary to buy an insurance policy for yourself, although most of the time the insurance can not be used, but of course it is best not to use it, because we are traveling to go home, and not to have an accident! Insurance is just to give yourself a peace of mind, so that the family's life has follow-up protection, is responsible for their own, but also for the family's consideration. Because when insurance really works, the beneficiary is also your family.