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787 test flight conditions detailed
Posted by Guy Norris 6:00 PM on Feb 07, 2013
Here are some more details of the conditions imposed on Boeing by the FAA to enable 787 flight tests to begin. Echoing some of the provisos levied on Boeing when it conducted today’s ferry flight of a 787 from Texas back to Everett, Wash, the FAA granted Boeing a “Special Airworthiness Certificate (for the purpose of Research and Development)” to conduct the testing. In particular these include the requirement that before flight, the crew must perform “a number of inspections to verify that the batteries and cables show no signs of damage.” The FAA says the pre-flight checklist will also include a mandatory check for specific status messages that could indicate possible battery problems.
Once airborne, the agency says the crew “must continuously monitor the flight computer for battery related status messages, and land immediately if one occurs.” Before the initial test flight, the crew must also inspect the airplane’s smoke barriers and insulation to verify that they meet the approved design. It also adds that experimental research and development flights will only be flown with Boeing aircrews that include only personnel essential to the flight.”
Fra Hersmans såkalte frokostmøte torsdag:
Transportation Safety Board said the results so far of an investigation into last month’s battery fire in a Japan Airlines 787 while it was parked at a Boston airport raise new questions about the safety certification of its batteries. An analysis of the origin of the fire contradicts some of the assumptions that were made about the battery’s safety at the time the system won government approval, the board’s chairwoman, Deborah Hersman, said.
The NTSB investigation shows the fire started with multiple short-circuits in one of the battery’s eight cells, she said. That created an uncontrolled chemical reaction known as “thermal runaway,” which is characterized by progressively hotter temperatures. That spread the short-circuiting to the rest of the cells and caused the fire, she said.
The findings are at odds with what Boeing told the FAA when that agency was working to certify the company’s newest and most technologically advanced plane for flight, Hersman said. Boeing said its testing showed that even when trying to induce short-circuiting, the condition and any fire were contained within a single cell, preventing thermal runaway and fire from spreading, she told reporters at a news conference.
Boeing’s testing also showed the batteries were likely to cause smoke in only 1 in 10 million flight hours, she said. But the Boston fire was followed nine days later by a smoking battery in an All Nippon Airways plane that made an emergency landing in Japan. The 787 fleet has recorded less than 100,000 flight hours, Hersman noted
Fra Hersmans såkalte frokostmøte torsdag:
Transportation Safety Board said the results so far of an investigation into last month’s battery fire in a Japan Airlines 787 while it was parked at a Boston airport raise new questions about the safety certification of its batteries. An analysis of the origin of the fire contradicts some of the assumptions that were made about the battery’s safety at the time the system won government approval, the board’s chairwoman, Deborah Hersman, said.
The NTSB investigation shows the fire started with multiple short-circuits in one of the battery’s eight cells, she said. That created an uncontrolled chemical reaction known as “thermal runaway,” which is characterized by progressively hotter temperatures. That spread the short-circuiting to the rest of the cells and caused the fire, she said.
The findings are at odds with what Boeing told the FAA when that agency was working to certify the company’s newest and most technologically advanced plane for flight, Hersman said. Boeing said its testing showed that even when trying to induce short-circuiting, the condition and any fire were contained within a single cell, preventing thermal runaway and fire from spreading, she told reporters at a news conference.
Boeing’s testing also showed the batteries were likely to cause smoke in only 1 in 10 million flight hours, she said. But the Boston fire was followed nine days later by a smoking battery in an All Nippon Airways plane that made an emergency landing in Japan. The 787 fleet has recorded less than 100,000 flight hours, Hersman noted
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