just yesterday (November 4)! In the afternoon, a y7515 flight from Novosibirsk, Russia to Sanya finally landed successfully after circling in the air for several hours due to a broken windshield in the cockpit. 166 passengers flying to Sanya experienced a moment of shock! What happened to the broken glass of Sanya passenger plane?
No casualties in the crash landing of the airliner
Russian North Star Airlines flight y7515 (with 166 passengers and 6 crew members on board) with a cracked windshield in its cockpit has successfully landed at Krasnoyarsk airport in Siberia Thursday afternoon, Xinhua quoted local media as saying. Fortunately, there were no casualties.
The Russian aircraft, nordstar flight, took off from Novosibirsk earlier in the day and was scheduled to fly to Sanya, China.
After taking off, an indicator on board sent out a "technical problem" signal. The crew noticed a crack in the windshield of the cockpit, and then decided to make an emergency landing at Krasnoyarsk airport.
Reported that the plane finally landed safely at 5:24 p.m. local time on the 4th, after circling the airport for several hours to dump fuel. At the time of landing, fire trucks and ambulances were on standby at the scene.
According to the flight standard, the flight took off from Novosibirsk at 12:48 local time on the 4th, and was scheduled to arrive at Sanya Phoenix Airport at 19:55 on the 4th, with a flight mileage of 4672 kilometers, a Boeing 737-800 and a 16.9-year-old aircraft.
The flight took off again after alternate landing and arrived at Sanya in the early morning of the 5th.
The plane can still fly with a broken window
According to the civil aviation resources network on November 1, according to the report of avherald, on October 31 local time, Brazilian South American Airlines flew from Sao Paulo, Brazil, to jj8050, Santiago, Chile, by Airbus A320-200 (Registration No. pr-mhp). When it flew to 50 nautical miles above Posadas, the capital of the northeastern province of messionez, Argentina, the plane encountered severe weather such as air flow and hail, and aircraft wind The windshield and radome were damaged. The cruise high speed setting of the aircraft rose from fl320 to fl340, and then dropped to fl300. Finally, the flight crew lowered the cruising altitude to fl240 and made an alternate landing at runway 11 of Buenos Aires Airport in Argentina.
In May this year, there were three cases:
On May 14, the windshield of Sichuan Airlines flight 3u8633 made an alternate landing in Chengdu due to the air burst.
Also in May, a Boeing 737 on Southwest Airlines made an emergency landing at Cleveland Airport in Ohio after its porthole broke.
On May 29, the Capital Airlines flight jd421, which took off from Xiaoshan Airport in Hangzhou and its destination was Nanzhuang Jinlan International Airport, returned shortly after taking off. According to Capital Airlines, the reason is also cracks in the outer windshield of the cockpit.
So is it a frequent accident that the windshield of an airplane falls off?
Party Shuwen, an associate professor at the flight school of Shanghai University of engineering and technology, said:
"The windshield in the cockpit of an aircraft falls off or breaks due to mechanical failure, such as loose fastening parts such as screws riveting the windshield, or the windshield itself cracks in the navigation environment.
When the aircraft is flying at high altitude, the probability of the windshield glass breaking or even blasting is very small, and it is not often broken in the aviation maintenance. '
Every editor has learned that for modern civil aviation airliners, the glass is not a thin layer, but a multi-layer structure like a thousand layer cake, which makes it difficult for a single window to break to affect the safety of aircraft flight.
Generally speaking, the porthole glass is divided into three layers, while the windshield in the cockpit is usually seven layers. The 'glass' of an airplane is not the kind of glass that people think of. It is usually a kind of synthetic fiber, which is often called' plexiglass'. Generally speaking, the porthole is made of acrylic fiber, which is popular with aviation manufacturers because of its transparency and plasticity. Moreover, the mechanical properties of the glass are also good, but the thickness and strength requirements of the inner and outer glass are not the same due to different functions.
Our daily passengers are in contact with the most inboard scuff proof glass of the porthole, which does not directly bear the force. More is to protect the inner glass from scratches, which can be easily replaced. Previously, the incident of the inner glass falling off was not absent, but it did not affect the safety.
The middle and outer glass is the real structural glass, which is used to bear the force brought by the pressure difference and ensure the flight safety. In particular, the outer glass is actually the part of the window area that really bears the pressure during the flight.
It can be said that without the middle and inner glass, there is no impact on the aircraft. However, the middle glass is actually the secondary insurance of the outer glass, which can also bear the pressure difference between the inside and outside. When the outermost glass breaks, it can ensure the safety of passengers. As in the southwest aviation incident, although the outer glass broke and fell off, due to the existence of the middle glass, the aircraft did not lose pressure.
The glass of airliner is monopolized by foreign countries
It is worth mentioning that at present, the world's major aircraft manufacturers are mainly Boeing and Airbus, and the vast majority of commercial aircraft windows are also made by a small number of suppliers. According to the "core company of global commercial aircraft windshield and porthole market 2018-2022" report released by asdnews website, the United States gentex, the United Kingdom GKN, the United States PPG industry group, the French Saint Gobain and the United States nordam group are the main members of the global commercial aircraft windshield and porthole market.
According to the report of science and technology daily, the strength and stress layer depth of the special flat glass with lithium aluminum silicon components developed by the United States, France and other countries are more than 50% higher than that of the ordinary chemical toughened glass, and the area per square meter can bear nearly 5000 kg of force. The thickness of the new aircraft windshield glass made of the original piece of glass can be reduced to less than 30mm under the condition of ensuring the bird impact strength of 600km / h, and the weight reduction effect is extremely significant.
With the rapid development of domestic large aircraft, domestic glass has been used in the porthole of domestic large aircraft C919.
According to the public information, Jiangsu tieanchor Glass Co., Ltd., COMAC Shanghai Aircraft Design and Research Institute and northwest Polytechnic University jointly built the China COMAC bird impact test base. This is the largest bird impact laboratory in East China. It can carry out tests on the front windshield, wing, flat tail and vertical tail of the aircraft at 1000 km / h and 3.6kg / h. The company has provided porthole glass for domestic C919 aircraft, and has undertaken the research and development tasks of some glass of arj-700 and domestic new boat 700.
According to previous media reports, an unnamed aircraft windshield ITO thin film laser engraving technology seller once introduced that aircraft windshield belongs to high-end manufacturing. At present, China's large aircraft windshield technology is just in its infancy, requiring continuous breakthroughs in technology, technology and equipment.