The July 24 report by the United Arab Emirates’ General Civil Aviation Authority (GCAA) on the Sept. 3, 2010, crash of a UPS Boeing 747 in Dubai urges operators of the Boeing freighter to consider the role aircraft vibrations and the acoustical energy they generate might play in onboard lithium-ion battery fires. While GCAA investigators suspect an onboard battery fire brought down the aircraft, they did not pinpoint the cause in their conclusions.
The FAA-approved Boeing service bulletin for the 787 calls for modification of the charger and battery monitoring unit to narrow the acceptable level of charge. In essence, this means lowering the maximum charge allowed and raising the minimum level of discharge allowed. In other words, it cuts the performance gain the lithium-ion technology is supposed to bring.
As Ethiopian Airlines, Qatar Airways and other Boeing 787 customers are returning their Dreamliners to service with battery system modification kits, the U.S. National Transportation Safety Board (NTSB) is still looking for the cause of the January 7 APU battery fire aboard a Japan Airlines 787 parked at Boston Logan International Airport.
As Ethiopian Airlines and other Boeing 787 customers prepared to return their Dreamliners to service with battery system modification kits, the U.S. National Transportation Safety Board (NTSB) conducted an exhaustive, two-day investigative hearing into the design and certification of the lithium-ion batteries implicated in the airplane’s grounding. Sixteen witnesses testified and answered questions during the hearing on April 23 and 24 at the Board’s Washington, D.C., headquarters.
Boeing executives expressed what they consider a “reasonable expectation” that the 787 Dreamliner would return to service in a matter of a few weeks at a briefing last Friday in Tokyo during which they detailed the company’s plan for certifying a solution to the “issues” surrounding the airplane’s lithium-ion batteries. However, Boeing Commercial Airplanes CEO Ray Conner and 787 chief program engineer Mike Sinnett acknowledged that the timing will depend completely on the U.S. Federal Aviation Administration’s certification schedule and a smooth execution of the testing.
The U.S. National Transportation Safety Board (NTSB) continues to focus on the design, certification and manufacturing processes of the lithium-ion battery system used on the grounded Boeing 787.
Only one business jet thus far has been certified with a lithium-ion main-ship battery, Cessna’s Citation CJ4, which employed lithium-iron phosphate technology, unlike the lithium-cobalt oxide chemistry in the Boeing 787 batteries. No other business jet has been certified with a lithium-ion main-ship battery, although Gulfstream had planned to employ a lithium-ion battery in the G650 before switching to a nickel-cadmium battery while the aircraft was still working its way toward certification.
Airbus has decided against using a lithium-ion main ship battery for the A350 XWB following the findings by the U.S. National Transportation Board of short-circuiting and “thermal runaway” in the APU battery that caught fire on January 7 in a Japa
In a February 7 news conference, NTSB chairman Deborah Hersman explained the latest findings on the battery problem that resulted in the grounding of the Boeing 787 fleet three weeks ago.
The U.S. National Transportation Safety Board has determined that several assumptions used in the Federal Aviation Administration’s application of nine special conditions in the certification of the lithium-ion battery system on the Boeing 787 proved incorrect, NTSB chairman Deborah Hersmann revealed Thursday during a media briefing at the board’s headquarters in Washington,