Firefighters at
Boston’s Logan International Airport opened the hatch of a burning
Boeing Co. (BA) 787 Dreamliner this week to encounter a hazard from something almost ubiquitous in modern life: lithium-based batteries.
The power sources for devices ranging from
Apple Inc. (AAPL)’s
iPad to tools to plug-in cars hold so much energy and are so flammable
that when they ignite, they can be difficult to extinguish as they spew
flames and even molten metal, according to U.S. government tests.
Boeing got U.S. regulators’
permission
to install lithium- ion batteries on the Dreamliner in 2007, three
years after passenger airlines were barred from carrying
non-rechargeable types as cargo. U.S. officials investigating the Jan. 7
fire will examine whether the 787 batteries met the government’s
conditions, said
Michael Barr, an instructor at the University of Southern California’s Aviation Safety and Security Program.
“We
know that batteries burn,” Barr said in an interview. “We know that
lithium batteries have a higher propensity to burn. Is there a basic
design issue?”
The review of this week’s fire probably will also examine whether the 2007 decision provided adequate safety, Barr said.
Boeing
installed multiple circuits to ensure that the plane’s power system
won’t overcharge the batteries, which can cause them to heat up and
burn, Mike Sinnett, the 787 chief project engineer, said in a briefing.
“We
put a lot of system protections in place to ensure that failures of the
battery don’t put the airplane at risk,” Sinnett said.
‘Batteries Burn’
The Jan. 7 fire on a
Japan Airlines Co. 787 occurred after passengers who had flown from
Tokyo left the plane, according to a release from the
National Transportation Safety Board, a U.S. agency that investigates aviation accidents.
A
rechargeable battery used to start the auxiliary power unit, a small
turbine engine that generates electricity on the ground, ignited,
according to the safety board. It took fire crews 40 minutes to
extinguish the fire, the safety board said.
GS Yuasa Corp. (6674) of Kyoto, Japan,
made the battery pack on the 787, Tsutomu Nishijima, a company spokesman, said in an interview. The firm sells them to
Thales SA (HO), which then supplies them to Boeing, Nishijima said.
While
fires in batteries are rare, they have been linked to aviation
accidents, electric vehicle blazes and exploding smartphones.
The U.S.
Federal Aviation Administration
has logged 33 instances in which batteries have caught fire on
commercial airplanes since 2009. Of those cases, 26, or 79 percent,
involved lithium batteries, according to the
agency.
Three cargo jets have been destroyed in fires since 2006 in which lithium batteries were present, according to the NTSB. The
United Nations’
International Civil Aviation Organization on Jan. 1 imposed new rules on air shipments of lithium batteries.
Volt Fire
Lithium-ion batteries used to power electric cars also have been probed by U.S. safety regulators.
In 2011, a
General Motors Co. (GM)
Chevrolet Volt caught fire three weeks after a government crash test,
spurring a congressional hearing. GM agreed to fortify the plug-in
hybrid’s battery packs so they wouldn’t ignite if cracked in an
accident.
Then in May, the U.S. National Highway Traffic Safety Administration joined an investigation in
Texas of a garage fire that destroyed a Fisker Automotive Inc. Karma, a $103,000 plug- in car.
Lithium-ion
batteries are safe as long as they are manufactured and used according
to regulatory standards, George Kerchner, executive director of the
Washington-based Rechargeable Battery Association trade group, said in
an e-mail statement.
“Billions of lithium-ion cells and
batteries are safely used in hundreds of consumer, military, medical and
electric vehicle applications every year,” Kerchner said.
Multiple Protections
The
Dreamliner is the first Boeing plane designed with lithium-ion
batteries as part of the electrical system. Boeing chose them for the
787, which uses more electricity than previous designs, because they
hold more energy and can be quickly recharged, Sinnett said.
In a
worst-case scenario in which the batteries do burn, they are designed
to do so in a way that doesn’t threaten the aircraft, Sinnett said. If
the jet is airborne, smoke is vented out of the compartment and won’t
reach the cabin. All of the battery cells can ignite without harming the
plane’s ability to stay aloft, he said.
Damage from the Jan. 7
fire was confined to within 20 inches (50.8 centimeters) of the battery
pack, the NTSB said. A photo released by the agency appeared to show
that nearby electrical equipment was untouched. The base where the
battery sat was charred, according to the photo.
Sheer Volume
The
Air Line Pilots Association, a union representing more than 50,000 pilots in
North America, urged in 2007 that the FAA require some type of fire extinguishing system for
lithium batteries on the 787, according to its response to the FAA.
The FAA rejected the union’s request, saying that the steps it required achieved the necessary level of safety.
The
union remains concerned about lithium batteries on commercial aircraft,
both those built into planes and those carried aboard as cargo or by
passengers, Mark Rogers, who leads hazardous-materials-handling issues
for the group, said in an interview.
“As more and more batteries
are produced, we are going to see more and more incidents just based on
the sheer volume,” Rogers said.
‘Learning Curve’
Lithium
batteries contain more stored electricity and have longer life than
comparably-sized batteries made with other materials. “Lithium-ion
batteries have so many advantages,”
Hans Weber, who runs San Diego-based aviation consultant Tecop International Inc., said. “They’re the future, no doubt about it.”
Their
power also makes them more likely than other battery types to create
heat and sparks if they short-circuit, and fires are difficult to
extinguish because the chemicals are flammable and contain oxygen,
Sinnett said. Fire extinguishers that snuff out most blazes don’t work
as well on lithium, he said.
Just as the NTSB and FAA are
keeping a close watch on how the battery could have ignited in the
Boeing plane, fire prevention are trying to develop techniques for
dousing battery blazes and storing them safely, said Kathleen Almand,
executive director of the Fire Protection Research Foundation in Quincy,
Massachusetts.
The
growth in battery use has led to more fires and greater interest in how
to handle them safely, Almand said in an interview. Her foundation is
part of the National Fire Protection
Association, a non-profit group that promotes fire safety.
The
foundation has studied how to safely store large quantities of
batteries in warehouses and how firefighters can attack fires in
electric vehicles, she said.
“There is a learning curve whenever
you implement a new state of-the-art-technology,” Jerry Back, senior
fire protection engineer at Baltimore-based
Hughes Associates Inc., said in an interview. “It just happens that this is used in everyday life.”
To contact the reporters on this story: Alan Levin in Washington at
alevin24@bloomberg.net; Susanna Ray in Seattle at
sray7@bloomberg.net