Despite a battery fire in one Boeing 787 Dreamliner and smoke in another, the batteries used to power the plane's electrical systems aren't necessarily unsafe — manufacturers just need to build in reliable safeguards, the nation's top aviation safety investigator said Wednesday.
National Transportation Safety Board Chairman Deborah Hersman said she doesn't want to "categorically" rule out the use of lithium ion batteries to power aircraft systems, even though it's clear that safeguards failed in the case of a Japan Airlines 787 that had a battery fire while parked at Boston's Logan International Airport last month.
"Obviously what we saw in the 787 battery fire in Boston shows us there were some risks that were not mitigated, that were not addressed," Ms. Hersman told reporters. The fire was "not what we would have expected to see in a brand-new battery in a brand-new airplane," she said.
The board is still weeks away from determining the cause of the Jan. 7 battery fire, Ms. Hersman said.
The 787 is the first airliner to make extensive use of lithium batteries. Aircraft makers view lithium batteries, which are lighter and can store more energy than other types of an equivalent size, as an important way to save on fuel costs. The Airbus A350, expected to be ready next year, also will make extensive use of lithium ion batteries. Manufacturers are also looking to retrofit existing planes, replacing other types of batteries with lithium ion.
But lithium batteries are more likely to short circuit and start a fire than other batteries if they are damaged, if there is a manufacturing flaw or if they are exposed to excessive heat.
Investigators are also looking into the special conditions the Federal Aviation Administration required the Boeing Co. to meet in order to use lithium ion batteries to power the 787's electrical systems, she said.
A government-industry advisory board that works closely with the FAA issued testing standards for lithium batteries used in aircraft operations several months after the agency had approved a separate testing regime for the 787's batteries.
"What happens is that when an aircraft is certified, it basically gets locked into the standards that were in existence at the time," Ms. Hersman said. Oftentimes, tougher standards will come along later, but aren't applied to already-approved aircraft designs. "Those are issues we do look at regularly in our investigations and it is something I'm sure we will be focusing on with the battery," she said.
Investigators have been working closely with the FAA on its review of its sanctioning of the 787's certification for flight, Ms. Hersman said. The FAA awarded the certification in August 2011.
Nine days after the battery fire in Boston, another battery overheated on an All Nippon Airways 787, leading to an emergency landing in Japan. The same day, FAA officials ordered U.S. carriers with 787s — there's only one, United Airlines, with six planes — to ground the planes. Aviation authorities in other countries swiftly followed suit. In all, 50 planes operated by seven airlines in six countries are grounded.
The 787 is Boeing's newest and most technologically advanced plane. The groundings have become a nightmare for the company, which has about 800 Dreamliner orders from airlines around the globe.