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.
U.S. National Transportation Safety Board (NTSB) members and technical specialists questioned representatives of Boeing and the Federal Aviation Administration on Tuesday about assumptions they made in determining the probability of lithium-ion batteries failing on the Boeing 787 Dreamliner.
Boeing and 787 operators around the world began installing modification kits in their Dreamliners last Friday after the U.S. Federal Aviation Administration approved the manufacturer’s proposed “fix” to their battery systems.
Boeing cleared one of the last hurdles in its campaign to return the 787 to service Friday afternoon, when the U.S. Federal Aviation Administration announced it had approved its design modifications for the airplane’s battery system. The FAA said the changes address risks at the battery cell level, the battery level and the aircraft level.
Boeing moved one step closer toward returning the 787 to service on Friday, when it flew Dreamliner Line Number 86 on a one-hour, 49-minute mission to demonstrate conformity of its battery system modification to U.S. certification authorities. Painted in LOT Polish Airlines livery, LN 86 took off from Paine Field in Everett, Washington, at 10:39 a.m.
Boeing took a significant step toward returning the 787 to service on Friday, when it flew Dreamliner Line Number 86 on a one-hour, 49-minute mission to demonstrate conformity of its battery system modification to U.S. certification authorities.
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.