On August 8, 2005, 42 Boeing 787 aircraft purchase agreements were formally signed, including China International Airlines 15 aircraft and Xiamen Airlines' 3 aircraft, all Boeing 787-8 aircraft. Later, Xiamen Airlines replaced three 787s with Boeing 737-800 aircraft. On May 9, 20 1 1, Xiamen Airlines officially signed a Boeing 787 purchase agreement with Boeing Company again, and ordered six Boeing 787-8 passenger planes. It is expected that the delivery of Xiamen Airlines will begin in 20 14. After a three-year delay in delivery, the Boeing 787 Dreamliner was delivered to ANA at 0: 20 on September 27th, 201/kloc-0. As a big order for Boeing 787, China booked 57 Dreamliners. Boeing 787 Dreamliner is known as the "new flying dream" of mankind, and it is the first brand-new model developed by Boeing since the launch of 777 14. ANA said that this 787 international flight will sail in June 5438+February and fly to Haneda-Beijing once a week.
Dreamliner also embodies the dream of manufacturing in China. Cheng Fei, Hafei and Shen Fei are the only suppliers of corresponding parts for this project.
20111On February 4th, Boeing 787 Dreamliner arrived at Beijing Capital International Airport. On the same day, Boeing 787 Dreamliner flew to Beijing. This flight officially launched the six-month round-the-world tour of this model-"Dream Tour". During the period from June 6th, 20 13 to June 6th, 2006 10, there have been seven Boeing 787 accidents in ANA and JAL, the two largest airlines in Japan. The causes of these seven accidents include battery circuit fire, fuel leakage, brake failure, broken cockpit windshield and so on.
Failure of Boeing 787 20 13
65438+10.7, JAL, after landing, the battery module of the auxiliary power system (APU) failed, and smoke came out of the engine room.
65438+1October 8, a fuel leakage accident occurred on the ground in JAL.
Flight 65438+ All Nippon Airways1October 9 was cancelled due to brake system failure.
65438+1October 10 All Nippon Airways, the flight was cancelled due to a false alarm in the computer system.
65438+1October 1 1 All Nippon Airways found cracks in the cockpit glass during the flight.
JAL suffered an oil spill during maintenance at Tokyo airport.
65438+1October 16 All Nippon Airways made an emergency landing due to smoke in the engine room.
July 13: Ethiopian Airlines caught fire on the apron of Heathrow Airport. At 0 10/310 EDT, a JAL Boeing 787 flight from Tokyo arrived at Boston Logan International Airport, and smoke suddenly appeared in the back cabin. Airport firefighters quickly checked the situation and put out the fire. Therefore, on June 6th, 2065438+2003+65438+2065438, FAA and NTSB (national transportation safety board, USA) announced that American Airlines temporarily grounded all Boeing 787 Dreamliners for safety inspection.
In addition, due to security issues, many airlines, such as India, Polish Airlines and Qatar Airways, also announced the temporary suspension of the Boeing 787 Dreamliner.
Lithium-ion batteries, which are blamed for the Boeing 787 passenger plane accident, have been widely used in electronic equipment such as notebook computers and mobile phones, and even in electric vehicles, satellites and F35 fighters of the US military. The lithium-ion battery used by Boeing Company is made by Yukasawa Company in Japan, which is twice as large as that used by ordinary electric vehicles. Tests in the laboratory have proved that it is safe, but there are frequent accidents when it is used on Boeing 787. Lithium-ion batteries are considered as the main source of batteries in the future. First of all, it is lighter than other batteries, but it can store more energy. However, if the battery is overcharged, it will easily catch fire, which is quite dangerous, because it contains a lot of oxygen, which has a combustion-supporting effect on the fire and is difficult to put out. The battery is easy to catch fire under high voltage and short circuit.
On the 26th, Lauran Brown, a spokeswoman for the Federal Aviation Administration (FAA), said that the report that the FAA approved the Boeing 787 Dreamliner to conduct a flight test on battery problems was seriously inaccurate, and denied that the flight test would start as early as next week.
In order to reduce the pressure on domestic airlines, Japan, which suffered from the grounding incident, introduced measures such as exempting Boeing 787 from parking fees at domestic airports. Is the battery overcharged or the charger faulty?
Boeing) 787 Dreamliner has frequent accidents. The reason why the 787 lithium battery was overcharged has been overturned, and the focus of the problem has turned to the electronic circuit of the charging device. Therefore, researchers from national transportation safety board (NTSB) arrived in Tucson, Arizona for a more detailed investigation.
NTSB's research team went to SecuraPlane Technologies, an avionics company owned by Meggitt, which manufactures batteries for Boeing 787, and conducted a detailed test on the battery charging equipment, power cord and battery management circuit board provided by the company. Japan's Ministry of Transport and American aviation safety personnel began to investigate the battery and other problems that caused the 787 flight safety accident at the beginning of 20 13, and the Boeing 787 passenger plane in the world was completely grounded from 65438+ 10/6.
For Boeing, the 787 Dreamliner symbolizes an important technical and business opportunity. It uses more advanced electronic technology, millions of lines of software code and lithium-ion battery technology, and achieves 20% higher fuel efficiency than its Boeing 767.
65438+ 10. On 7 October, a passenger-free 787 Dreamliner of JAL caught fire at Boston Airport in the United States. It was suspected that the accident was caused by the lithium-ion battery of the aircraft auxiliary power unit (APU), which became the key for security personnel to initially lock the Dreamliner incident investigation. Because this incident has some similarities with the fire accident of lithium-ion battery in Chevrolet Volt crash test.
Investigators said that they inspected the 32V battery by X-ray and CT scanning, and disassembled the APU battery into eight battery units for detailed inspection. Later, three battery cells that must be further examined by X-ray were selected to observe the internal structure of these batteries in detail.
NTSB subsequently issued a statement pointing out that from the flight recorder data of JAL B- 787 aircraft, the charging amount of APU battery did not exceed the design upper limit of 32V, thus overthrowing the initial cause of overheating and fire caused by overcharge of lithium batteries on the aircraft.
After eliminating the cause of the accident caused by battery overcharge, NTSB investigators began to turn their investigation focus to SecuraPlane Technologies, which manufactures batteries for Boeing 787, looking for other possible causes, such as wire system and electronic circuit of charging device.
SecuraPlane Technologies was acquired by Meggitt Company of the United Kingdom in 20 1 1. According to the website of SecuraPlane, the company has been providing various avionics for the aviation field since 1986, including aircraft safety systems, lithium batteries, chargers and converters, as well as Vienna rectifiers, power MOSFET/IGBT, planar transformers, supercapacitors and advanced pulse width modulation.
According to the data of Boeing 787 BCU, the control unit uses advanced DC frequency conversion technology, patented charging algorithm, complete diagnosis and fault isolation to charge the APU battery.
The size of this rack-mounted BCU system is about 14.7×5.0×7.7 inches, and its weight is 1 1 lb. It provides a minimum input power of 23VDC and a maximum output power of 1 1,500 W. According to foreign media reports, these passenger planes, which are called "dream flights", will probably return to flight in a few weeks instead of waiting for months or even years. Boeing introduced that they improved the performance of the battery pack in operation, adjusted the battery system, and added a brand-new shell for the battery.
The improved battery operating system will be able to cope with more demanding tests. It is reported that Boeing joint battery manufacturer GS Yuasa and Thales, the supplier of integrated power conversion system, have come up with 10 new test schemes. In these test schemes, the battery pack in the aircraft must pass the test of 14 days.
In addition, Boeing has also adjusted the battery charging value-that is, reducing the maximum chargeable amount and increasing the minimum chargeable amount.
In addition to improving the battery system itself, Boeing has added two new components-electrical insulator and thermal insulator. They are installed around or under each battery to prevent heat transfer between batteries. In addition, Boeing has also adjusted the performance of steel wires and wires in the battery to ensure that they are not affected by temperature rise and friction. In addition, some small holes are added under each battery box, so that the water generated during the operation of the battery pack can flow out instead of staying inside.
According to Boeing's statement, a 787 passenger plane took off from Seattle, Washington, USA at 9 12: 32 local time, carrying a number of pilots and other testers, flying for about 2 hours and 20 minutes and returning to Seattle to land. During the flight test, the test team "monitors the performance of the main and auxiliary batteries", and the obtained data will be used for battery accident investigation. The test team "reported that the test flight was peaceful" and "can't provide more details" because the investigation is still in progress. There were many accidents such as battery fire in Boeing 787, and the suspected new lithium battery was the "culprit". Dozens of Boeing 787s around the world are grounded, waiting for the investigation results of Boeing Company, Boeing 787 suppliers and the governments of the United States and Japan. On February 4th, Boeing applied to the Federal Aviation Administration (FAA) for a test "cargo" flight of the 787, and was approved.
20 13, 19 On April 9, the FAA approved the battery improvement scheme of the 787 Dreamliner, which cleared the way for Boeing and its customers to install the improved battery, and will make the existing 787 resume operation, and the delivery of the new aircraft will also be restarted. FAA approval will allow the American 787 to resume operation after applying battery improvement. For 787 in other countries and 787 repaired outside the United States, the local bureau will issue the final license to resume operation. Boeing has sent special teams around the world to start installing the improved 787 battery system on the 787. The kits and parts needed for the new battery system will be delivered soon, and the new battery will also be delivered soon. The team sent to the customer will start installing the new system. The aircraft will be repaired in the order of delivery.
Connor said: "The Boeing team is ready to help the customer's 787 return to the blue sky and soar again. "
Boeing will also begin to install improved batteries for new aircraft at its two 787 assembly plants, and the delivery of the aircraft is expected to resume within a few weeks. Although the delivery of the 787 was suspended on June 5438+ 10, Boeing expects to complete the delivery target of 20 13 before the end of the year. Boeing also expects that the 787 battery problem will not have a significant impact on the financial guidance value of 20 13.
On June 2nd, 65438, Marc Allen, president of Boeing China, who planned to attend Chengdu Fortune Global Forum 20 13, said in an interview that Boeing's first Dreamliner Boeing 787 had been delivered several times during the delivery process, but it had been delivered in many countries such as Japan and India before. It is expected that the first Dreamliner Boeing 787 will be delivered to China within a few weeks.
20 13 On April 27th, Boeing 787 passed the battery test. On May 20th of the same year, United Airlines said that a Boeing 787 Dreamliner owned by United Airlines will fly from Houston to Chicago on Monday, with more than 250 passengers on board, including two CEOs of United Airlines and Boeing.
On June, 2065438+2003 1 day, ANA NH905, NH 1255 and JAL JL2 1 arrived at the Capital Airport one after another, which opened the curtain for the resumption of flights. Boeing's 787 Dreamliner has been grounded all over the world since it exposed the hidden danger of high-temperature spontaneous combustion of battery packs, which makes Boeing and many partners frown. However, the new battery pack developed by GS Tangqian Company in Japan may help Boeing 787 return to the blue sky.
Foreign media reported today that Boeing conducted its last flight test in Washington before submitting the 787 commercial flight review to federal regulators. The test aircraft is equipped with a new battery pack developed by GS Tangqian. After about two hours of flight test, the company reported that the new battery pack can work normally under both standard and non-standard flight conditions.
Boeing said it would submit the test report to the Federal Aviation Administration (FAA) for review to decide whether to allow the 787 to resume commercial flights. .
It is expected that the FAA will hold a hearing, which may put an end to the battery storm of Boeing 787. 2013165438+1On October 24th, Boeing Company of the United States issued a warning to airlines, saying that some engines of Boeing 747 and 787 passenger planes were at risk of icing. The warning involves two types of passenger planes, 747-8 and 787, which are equipped with GE Genx engines. Excluding the 787 passenger plane equipped with Rolls-Royce Rida 1000 engine.
Boeing said that before issuing the above warning, there had been several cases in which the engine performance was temporarily reduced due to icing. However, the company also guarantees that only a few Genx engines have had icing problems during flight. Boeing pointed out that it has cooperated with General Motors and related companies to find a solution. At the same time, Boeing advised the passenger plane involved to keep a distance of at least 50 nautical miles from storms that may contain ice crystals.
The 787 passenger plane was grounded for several months due to battery problems at the beginning of 20 13. After being put into use again, the 787 passenger plane suffered a series of other technical accidents. On March 8, 20 14, Boeing said that it was checking the wings of 42 Boeing 787 Dreamliners for tiny cracks caused by manufacturing defects.
Boeing blamed the above problems on the change of manufacturing process of supplier Mitsubishi Heavy Industries. Boeing said that solving the above problems will also delay the delivery time of some Boeing 787 aircraft. A few days ago, Al Jazeera exclusively disclosed that Boeing employees broke the news that the safety of Boeing 787 Dreamliner was in doubt, 90% of the defects were deliberately concealed, and even employees were afraid to ride!
In response to relevant reports, Boeing stressed that Boeing attaches great importance to the safety of aircraft quality control, and all 787 passenger planes have undergone rigorous tests.
Boeing 787 Dreamliner, once called "the future plane" by US President Barack Obama, has been in constant turmoil since its maiden voyage on 20 1 1. 20 1 1, accidents occurred one after another, and it was grounded for three months.
Simplify procedures in order to catch up with the work progress.
Al Jazeera also obtained Boeing's internal documents, showing that in 20 10, the production plan of Boeing 787 was two years behind schedule, and Boeing lowered its basic technical standards to catch up with the progress. "In one of the memos, the management instructed the engineer that Boeing's existing quality control procedures may have to be simplified because of the need to catch up with the work schedule." Cynthia Cole, a 32-year-old Boeing employee, was once the head of the engineers' union, and she was extremely shocked. "People don't change the quality process just to catch up with work. I can't understand how these people let go of this and agree with them. How can they sleep at night? "
In addition, some engineers also said that some colleagues involved in the manufacture of Boeing 787 were suspected of using drugs.
"Cocaine and painkillers are easily available in factories." A mechanic said, "And you can also smoke good marijuana here."
Another Boeing employee said that Boeing will not conduct random drug tests on employees. "Some people go out to smoke marijuana at lunch time."
Boeing quickly clarified such negative accusations.
According to the company, the assembly and delivery processes in factories in South Carolina and Washington State have reached the highest safety and quality standards, and all passenger planes have undergone rigorous testing, verification and inspection. The company also carried out drug testing for employees in accordance with regulations.
In an interview with Loftis, the planning director of Boeing 787, Loftis refused to respond when asked relevant questions, and then interrupted the interview. The person in charge of the Boeing 787 project said: "Boeing's primary concern is to ensure the safety and airworthiness of the aircraft, the integrity and integrity of the aircraft, and the consistency of the quality of the aircraft delivered from the factory."
Although Boeing emphasizes the importance of aircraft quality control and safety, the accusations of its own family are by no means groundless, and Boeing is bound to carry out internal rectification.