Experts explain why the lost-aircraft passenger phone can get through

As of 22:30 last night, the Malaysian Airlines MH370 flight had been lost for more than 68 hours, and during this period the information on the situation and wreckage of the aircraft before the flight was continuously heard, but was not confirmed. Yesterday for the airliner before the incident had tried to turn back, the failure of the former captain why did not send any signal, the black box did not send a signal, the plane after the passenger phone can still get through the abnormal situation, the relevant experts have been analyzed and interpreted. Radar shows the passenger plane disappeared before the turn, the United States to monitor the absence of explosive evidence to explain what? Aircraft or in the event of a serious breakdown of the collapse of the sea, the commander of the Malaysian Air Force said 9th, Radar records showed that the aircraft before the incident had a turn-around flight signs, and then disappeared from the radar. U.S. officials said the Pentagon used the global monitoring system to initially look at the MH370 vanishing point data, did not find evidence of explosions in the region. What does that mean? Song Wen, an associate professor of aeronautics and astronautics at Shanghai Jiao Tong University, said that if the plane had returned, the pilot had found that the plane had a serious malfunction before choosing to return, but the news was unconfirmed. As for the Pentagon's failure to find evidence of an explosion in the area, it only means that the aircraft was not dissolved by the explosion. The Pentagon's global monitoring decency is used to detect missile launches and is measured by temperature. If the plane disintegrates, the monitoring system will not be found. So with all the signs now, Song Wen said, the likelihood of a collapse would be greatest after a serious mechanical failure on the plane. Guangdong Changsheng Aircraft Design Co., Ltd. chief designer Zhou Jisheng that the area of the failure of the aircraft can be very large, the Pentagon global monitoring system is also through satellite detection, satellite coverage has a certain range, can not be seen everywhere. What is the interference with the final contact of the aircraft? All communication equipment failure possibility low vision there have been reports that before the airliner was lost, another Boeing 777 aircraft trainer should be contacted by the Vietnam Air Traffic control center, using emergency frequency. Successful contact, the technician heard the other end of the murmur, but static interference, also did not receive a distress signal sent. This is the last time MH370 get in touch with them. What does that mean? Analysis Song Wen said, civil aircraft communication system between the common frequency, can achieve a separate contact. When the air pipe on the ground is not connected to the aircraft, it is often requested to contact the aircraft and the aircraft in close proximity. If the emergency frequency shows a lot of interference, it must indicate that the aircraft has been a serious failure, all communications equipment failed. Zhou Jisheng a different opinion. He said there was little likelihood that the two civil aircraft would be connected to each other without air links. Logically, if the two planes can talk to each other, it means that the aircraft communication decency is not malfunctioning. Why didn't the black box send the air crash signal? or fall into the depths of the ocean. The signal is too weak to be detected. The black box is one of the aircraft's special electronic recording equipment, if the fall of the sea contact with the water, it will send signals, and start positioning function. The plane's black box is damaged, why not signal? Analysis Zhou Jisheng said, usually, the black box after the crash can be preserved. But generally in the deep sea, covered by covering the case, the black box signal will be weakened, and the black box signal is also a certain range. International-level meritorious test pilot, Air Force flight testing expert Xu Yongling also said that the black box to send out radio signals, including the crash signal, is conditional. The condition is that those points that receive the signal must be near it, too far from it. The point of the signal if it is in the deep sea, the land probe is also difficult to find, until China, Vietnam, Malaysia and other countries to receive, it is possible that the power supply has expired. Song Wen says the battery on the locator on the black box is available for 30 days. But if the black box falls to the deep sea, the signal is very weak, land detectors difficult to find. Why can the passenger's mobile phone get through, can locate? Mobile phone before boarding is stolen or just transferred to the passenger family car, Mr. 7th said, learned that cousin's flight was lost, he dialed the other side of the phone, the response is temporarily unable to connect. 9th, another family member said his phone can be reached, MA Airlines Business president also confirmed that the telephone number can be opened, but no answer, which is currently the only phone on the missing aircraft. Why is that? Analysis of a telecommunications operator said that when the phone is completely damaged or in the absence of network signal area, dial the phone to hear the tone will be the phone you dialed can not be connected. However, the current outgoing mobile phones are using the number of overseas telecommunications operators, in the end what kind of beep, it is not clear. Communications professional doctor, Science Squirrel will members, network celebrities, the internet celebrity of the mobile phone can get through the situation speculated that the loss of the sea without cell phone signal, more likely that the phone is not with the owner boarded the plane, such as boarding before the flight was stolen. Shankai, a professor at Beijing University of Posts and telecommunications, suggested another possibility that the phone had been set up for call forwarding or moved to voicemail, in which case a call might be answered. Shu Huaying, Ph. D., a doctoral tutor at Beijing University of Posts and telecommunications, said that the current smartphone is basically built with a GPS module, the mobile phone can work in the case can be positioned in the scene of the search and rescue vessels should have such a signal collection capacity. But if a mobile phone really works, it should have been found by a search and rescue vessel, and it will not come to nothing. In addition, mobile phone signal is required to cover the base station, while on the high seas, there is no telecommunications base station, there should be no mobile phone signal exists. In the absence of signal, even if the phone is intact, it will be unable to connect the state, but also unable to locate. Why does the passenger mobile phone QQ display the login status? Do not exit online status when shutdown to maintain a different image passenger family car Mr. 7th Night said that he logged in QQ that night when he found cousin's head is bright, which means that the other side in the login status. Why is this happening? Analysis Tencent responded that the user did not perform normal exit operation, direct shutdown of the mobile phone, mobile phone QQ will maintain a period of time online status. Tencent said it would do its best to support search and rescue needs if necessary. AircraftIs the failure of the alliance a terrorist attack? The probability of a terrorist attack is lower. At present, speculation about the terrorist attacks on MH370 has become a hot spot, mainly because of the news that two passengers boarded the airliner with a fake passport late 8th. However, no organization has so far claimed, and appears to be inconsistent with the previous terrorist attack process. Is the plane's failure a terrorist attack? Analysis of Shukurdzhon, an aviation analyst at American Standard and poor, said the motives for any terrorist attack could not be determined at the moment. In addition, the boarding of a fake passport cannot be equated with terrorism. Li Wei, an expert on counter-terrorism at the China Institute of Modern International Relations, said that from the current leaked information of the aircraft, although there are also the possibility of terrorist attacks, but the probability is relatively low. Li said that we have studied the past terrorist activities and found that terrorist attacks on civil aircraft have certain characteristics and laws. First, many of the previous terrorist attacks have no criminal record, no fake passports, most of the use of fake passports are the backbone, and as a major means of their movement in different countries around the world. Secondly, terrorist terrorist activities also pay attention to the cost effect. That is, they have to make the most of the panic through terrorist attacks, or to highlight political and political claims, but the loss of the flight has so far not seen the possibility of some associated terrorist forces. Third, from the current situation, if it is a terrorist attack, the terrorists have to do is to destroy the communication facilities on the aircraft, and then cause the plane to fall out of control. The cockpit of the current flight is so well fortified that it's hard to break through. According to the Beijing Times