Discuss Malaysia Airlines lost sentences with parents, not less than 5 sentences.

When a passenger plane is performing a flight mission, the transponder on the plane will send a signal to inform the ground controller of its flight position, altitude and speed at any time. Before each flight takes off, in addition to executing its own flight number, an answering machine code will be assigned to represent the aircraft. After take-off, the secondary radar on the ground can search the plane through the signal sent by the transponder. When flight MH370 lost contact with the ground at 2:4 1, the ground secondary radar could not intercept the transponder signal, so it disappeared from the radar screen.

Malaysia Airlines MH370 passenger plane lost contact with the control department of Ho Chi Minh control zone from the early morning of the 8th, and lost radar signal at the same time. This situation is rare. According to the data of Flightradar24 (an internationally famous flight application), the last altitude before MH370 disappeared was 0, while the penultimate data was FL350 (normal flight altitude), so the aircraft signal suddenly terminated. There is no signal from the transponder on the plane, either the pilot turned off the transponder voluntarily, or the transponder failed or the plane was cut off.

In addition, even if the transponder is turned off, the primary surveillance radar on the ground can still search for the aircraft (the transponder can only turn off the altitude display, not the position display). After the altitude display of the transponder is turned off, the plane will still have a "point" on the radar of the ground air station. Therefore, it is most likely that the transponder fails or other aircraft failures cause the transponder to be unable to send signals.

Based on the analysis of Reuters and the battalion chief, there are four possibilities for this situation. First of all, the plane crashed suddenly due to meteorological reasons, such as thunderstorms and clear-sky turbulence (but judging from the weather data on the day of Malaysia Airlines Flight 370, there was no extreme weather in the area at that time); The second is that the pilot's operational error caused the aircraft to fall into an uncontrollable state. Judging from the current situation, this possibility is not great, because "even if it crashes suddenly, it needs a process, and anyone in the cockpit can immediately send out a distress signal"; The third type is the extremely serious damage or explosion of the aircraft, such as engine explosion and oil circuit explosion. This possibility exists; The fourth is the terrorist attack.

Why didn't the pilot send out any distress signals?

In principle, it is very easy for pilots to send out danger signals, such as calling May Day by radio or sending codes by answering machine, where 7500 stands for hijacking and 7700 stands for failure. But this flight didn't send out any distress signal. Why?

The 370 is a 777 aircraft, which belongs to an advanced model. Any mechanical failure of the aircraft can be immediately notified to the crew through the system, and the crew can handle the failure according to the report of the system and notify the ground terminal at the same time. The flight crew of Malaysia Airlines Flight 370 didn't send out any report, so the plane disappeared, indicating that it was likely to encounter an extremely serious "crash" problem in an instant, which made them have no time and ability to deal with and report. In the famous air France passenger plane crash, the reason was that the co-pilot made a mistake and didn't have time to send out any distress signal. The British "Wenhua Weekly" interviewed a senior Boeing captain and learned that it is almost impossible for such advanced aircraft parts and systems to "collapse" instantly due to mechanical failure.

Generally speaking, the pilot will lose the ability of "disposal and notification" such as rapid disintegration, disintegration and falling only when the aircraft operating surface and engine room are damaged in an instant. In this case, there will be a huge air pressure difference, oxygen loss and overweight, which will make the pilot unable to move at all No matter how experienced a pilot is, he is also a human being. At this time, he can't do anything.

The plane was a twin-engine system and disappeared at an altitude of 35,000 feet. Even if the power of the plane was completely lost at that time, the plane could glide for more than 300 kilometers, and the crew had enough time to make an emergency call. Therefore, there is almost only one situation in which the pilot has not issued any report, that is, the "extreme situation" mentioned above has occurred.

After the plane lost contact, did Malaysia Airlines deliberately delay the report?

Earlier, Malaysia Airlines confirmed that Flight MH370 lost contact with Subang Air Traffic Control Station at 2: 40 am on March 8. Yesterday morning, in the press release issued by Malaysia Airlines, the lost time was changed to 65438+ 0: 30 in the morning. Malaysia Airlines' first "media release" was released at 7: 24 am, with an interval of nearly 5 or 6 hours. This time difference has been questioned by the media and the families of the lost passengers.

Zhang Qihuai, vice president of the Beijing Aviation Law Research Association, said that according to the relevant rules of civil aviation, if the crew on board found that the air-ground contact was interrupted or there was a problem with the call, they should check whether the plane broke down after 30 seconds and start the emergency plan after 3 to 5 minutes. If the ground finds that the contact with the aircraft is interrupted 15 to 20 minutes, it should start the emergency plan to judge whether there is a major accident. "This time, Malaysia Airlines didn't announce the news until several hours after it found out that it was lost, whether it was the obligation to inform the passengers' families or the obligation to seek help. "Some family members questioned that" delaying reporting may delay the best rescue opportunity ".

In this regard, a senior domestic captain also has other views. "The lost time announced by Malaysia Airlines should be when the plane enters the cruise two hours after take-off, which is also the most stable time for an aircraft. Suddenly disappear from the secondary radar screen, when the air traffic control will call the captain on various channels. If there is no answer, then according to the procedure, it is necessary to trace whether the flight has flown to the next control area. Therefore, what China Airlines needs to do is to check with each other until Ling Shu traced it back to 6 o'clock and China Air Traffic Control Bureau responded that the flight did not enter the control area. At this time, it is certain to lose contact, otherwise the airline can't rashly release information, causing unnecessary panic. "

Why can't we locate the plane so far?

Until 6: 00 this morning, the exact location of the lost plane could not be determined, and the maritime search and rescue did not find the exact location of the wreckage. At this time, more than 50 hours have passed since the plane lost contact. However, looking back at history, Air France Flight 447 suddenly disappeared while flying over the Atlantic Ocean, and was declared missing on June 1 day. It was not until June 7 that the Brazilian military found the tail of the plane and confirmed that it was Air France Flight 447 according to its number, and the airline officially announced that the plane crashed. At this time, more than 40 hours have passed/kloc-0.

Some people think that the lost area of MH370 is in the Gulf of Thailand, and the average water depth in the Gulf of Thailand is only 45 meters. Search and rescue is much less difficult than the Atlantic Ocean where Air France 447 crashed (with an average water depth of 3,627 meters). However, if there is a real crash, the search for the wreckage may last for a very long time, and the difficulty of searching for an airplane in the sea is not much different from that of finding a needle in a haystack.

There may be two reasons involved here, 1. Civil aviation accidents mainly look for the first incident point, and the crash point is uncertain (only the missing point is known), which leads to the expansion of the search area. MH370 was flying at sea when it lost contact, which can only be inferred from the last call and the radar vanishing point; 2. In Malaysia, Vietnam and other countries, there is no professional search and rescue team, and the search and rescue ability is poor. Moreover, a large number of related instruments and equipment are needed for maritime search, so it is very difficult to look at it only with the naked eyes of pilots. Although many countries, including China, participated in the search and rescue, Malaysia and Vietnam were the main search and rescue forces because the lost location was near Vietnam after all.

With regard to the difficulty of searching for the wreckage of an aerospace vehicle, apart from Air France 447, Columbia is also a classic example. In the final stage of its return flight, it disintegrated over the land of the United States, and the debris was scattered for dozens of kilometers. After searching for the black box for several months, I couldn't find it. After analyzing the characteristics of scattered debris by computer programming and considering factors such as gravity and wind, I roughly delineated the scope and found it.

If you want to find the plane, there is another way, relying on the black box. There are two black boxes on the plane. One is a black box that records all flight data information, and the other is a cockpit recorder, which records all conversations of crew members and all calls with terminal commanders and controllers. Both black boxes can send out signals to facilitate search. In addition to the black box, there is also an ELT (Emergency Positioning Transmitter) device on the plane. After an emergency, it will start its function, such as when the plane touches the ground or falls into the sea and is soaked by seawater, it will start to release its own signals.

The design principle of black box and ELT is not to be broken, but also to be waterproof. Theoretically, it will not fail because of falling and sinking into the seabed, and the signal can be transmitted for several months. The sea situation of the accident with Air France in that year was much more complicated than this one, and it was finally found. There are many reasons why I can't find it for the time being. The crash location of Malaysia Airlines Flight 370 is likely to deviate from the lost location, which will lead to a large search range.

Two people boarding a plane with fake passports may just be illegal immigrants?

Two Italian and Austrian passengers who were impersonated to board the plane had three connecting flights: Kuala Lumpur-> Beijing->; Amsterdam->; In Copenhagen (Frankfurt), Thai baht pays for air tickets and chooses seats. According to professional analysis, this is logically more likely to be smuggling.

The British "Guardian" reported that two fake passports of Malaysia Airlines lost passenger plane were stolen in Phuket, Thailand. When renting a car in Phuket, you often have to deduct your passport. Coupled with the huge number of tourists, they are often stolen. It is believed that hundreds of stolen passports enter the black market in Phuket every year. Using a fake passport may be asylum. Six Syrians planning to travel to Sweden via Beijing were arrested in Phuket with fake passports. According to their confessions, refugees have used this method before. The BBC also pointed out that fake passports may also involve smuggling. In 20 10, Air India Express Flight 8 12 ran off the runway, and 158 people were killed. It was later discovered that there were 10 fake passports.

Another example is that in June 5438+1October 65438+March this year, when the border police of Beijing Capital International Airport went through the transit formalities for international transit passengers, they found that six foreign passengers who took a flight from Southeast Asia to Beijing and then transferred to Europe used forged passports, and these six passengers tried to sneak into Europe via China.

However, according to the news in Reuters early this morning, an Interpol spokesman said that after checking all the documents used to board the "Malaysia Airlines lost passenger plane", "more suspicious passports" have been found and further investigation is under way.

Malaysia's Minister of Transport said yesterday that the identities of two passengers who boarded the Malaysia Airlines lost passenger plane with stolen passports have been confirmed, and they have been monitored and photographed. However, their nationality will not be announced and is currently under investigation. Since there is a monitoring screen, it can be said that the truth will not be too far away.

The family members of the lost plane said that "the mobile phone is easy to use and QQ is online"?

Yesterday 12: 45, at the press conference held by Malaysia Airlines for the families of the missing persons, a family member said that he called his brother four times, and his brother was on this flight. "But no one answered the phone. It seems to be hanging all the time." However, according to the analysis of telecom professionals, this is probably the illusion caused by the call forwarding set on the mobile phone.

If it is determined that it is not a call transfer, some professionals believe that since the maximum radius of a communication base station is generally 30 to 50km, it can be extended to 120km after adopting the double-slot tower-releasing technology, which is mostly used for sea surface coverage, and the ring back tone is not answered. If the factors such as call forwarding are excluded, the passenger's mobile phone should have entered the signal coverage area of the base station, that is, land or offshore. Judging from the current situation, the radar signal has disappeared and the plane is likely to have disintegrated over the sea. Then the passenger's mobile phone was mixed in the wreckage of the plane and floated offshore with the ocean current, which is a very high probability explanation.

According to the Beijing Times, there are three people on the plane whose QQ numbers are online continuously. But the online status of QQ doesn't explain too many problems. This will happen if the account is used by others and the device automatically stays logged in. And the iphone is turned off after logging into qq, always online. According to netizens, this situation is very common. "I used to fly. When I turned it on, I found that my colleagues asked me during the shutdown: Why not turn it off on qq?" According to the analysis, the reason may be that the application was not closed first, but it was shut down directly.

Don't take a red-eye flight unless you have to?

Yesterday, a post "An aviation professional's analysis of the accident" was widely circulated on WeChat and Weibo. There is nothing to analyze in this post, mainly suggesting, "Don't take a red-eye flight unless you have to." The so-called red-eye flight refers to a flight with a flight time of no more than 8 hours and a departure time after zero.

After Malaysia Airlines lost contact, many people said that they should avoid taking red-eye flights, so will flying at night really sacrifice safety? In fact, so far, there is no evidence that the plane lost contact with the red-eye flight, and there is no data to prove that the red-eye flight will have a higher accident probability.

For a long time, the safety of "red-eye flight" has worried many people. In this regard, the captain of a domestic airline said that the safety of "red-eye flights" is not much different from that of daytime flights. Because in some areas, there are fewer aircraft flying at night than during the day, and the air flow at night is relatively stable, the flight safety at night will not be lower than during the day for aircraft flying with instruments.

Song Wenbin, a professor at the School of Aeronautics and Astronautics of Shanghai Jiaotong University, said that pilots have strict rules on flight time and itinerary. If these regulations are followed, pilots will have enough rest time and will not be tired after flying at night.