U.S. officials are investigating a fire aboard a 
Boeing Co. (BA) 787 Dreamliner in 
Boston after a 
Japan Airlines Co. (9201) flight from 
Tokyo, the latest setback for the jet following several groundings last month.
Flames about two feet (0.6 meter) high shot out of an avionics bay in
 the jet’s belly yesterday as the plane sat at a Logan International 
Airport gate before its next departure, and there was a small explosion,
 Massachusetts Port Authority Fire Chief Robert Donahue said in an 
interview. Japan Airlines, which has seven 787s, won’t ground other 
Dreamliners.
Boeing’s newest model has been plagued by incidents 
since entering commercial service in late 2011, and a previous fire in 
the avionics bay forced the test fleet to be parked in 2010. Electrical 
faults in December forced 
United Continental Holdings Inc. (UAL) and 
Qatar Airways
 Ltd. to ground 787s, the first jet with a fuselage made chiefly of 
composite materials instead of aluminum and with an all-electric power 
system.
“In-flight fires are very serious,” said John Cox, a 
former airline pilot who now consults on safety issues with 
Washington-based firm Safety Operating Systems. “Although this happened 
on the ground, the idea that there was a fire on board means that this 
needs to be carefully evaluated.”
Japan Airlines
 said its 787 service to Boston from Tokyo today will fly as scheduled. 
Yesterday’s return trip to Tokyo was canceled, Sze Hunn Yap, a 
spokeswoman, said today in a telephone interview. 
Smoke 
The
 smoke was traced to a fire from the battery used for the auxiliary 
power unit, Japan Airlines said in a statement today, as the U.S. 
National Transportation Safety Board and 
Federal Aviation Administration began their own inquiries. The unit, which is made by 
United Technologies Corp. (UTX), is designed to provide electricity when the engines are off.
GS Yuasa Corp. (6674)
 made the battery involved in the 787 fire and it’s cooperating with the
 investigation, Tsutomu Nishijima, a spokesman for the Kyoto-based 
company said by phone. GS Yuasa isn’t aware of the reason for the fire, 
he said.
The company’s shares declined 4 percent to 335 yen in Tokyo trading today, the biggest drop since Oct. 23.
Japan
 Airlines gained 1.1 percent to 3,780 yen in Tokyo trading today. The 
company has checked the batteries of five of its 787 aircraft and 
inspection of the sixth will be completed by 6 a.m. tomorrow, spokesman 
Taro Namba said. 
ANA’s Checks 
All Nippon Airways Co., 
the initial operator of the 787, received a communication from the 
transport ministry to check all its 787s and the company will inspect 
the batteries on all its 787s by today, spokesman Ryosei Nomura said by 
phone.
ANA, as the carrier is also known, wasn’t doing anything 
different with its fleet in light of the Japan Airlines incident, said 
Nao Gunji, a spokeswoman. Boeing said it wasn’t making any changes to 
its test-flight plans for other 787s, either.
The NTSB sent an investigator to Boston, said 
Kelly Nantel, a spokeswoman. The FAA, the agency that certified the jet’s design in 2011, said it also is looking into the fire.
“Anything
 that involves a fire does not get the luxury of being called a teething
 problem,” said Carter Leake, an analyst at BB&T Capital Markets in 
Richmond, 
Virginia,
 and a former military and commercial airline pilot. “Boeing needs to 
get ahead of this quickly, because now you run the risk of getting into a
 passenger aversion issue.” 
Stock Drops 
While last month’s Qatar Airways failure came on the plane’s delivery flight, a United jet had to make an emergency landing in 
New Orleans while carrying passengers to 
New Jersey’s Newark airport from Houston.
Debris
 in an electrical panel on a Dreamliner sparked an in-flight fire in 
late 2010, before the plane entered service, grounding the entire test 
fleet for six weeks and forcing a redesign of parts of the system that 
added six months to more than three years of delivery delays on the 
plane.
Boeing fell 2 percent yesterday to $76.13 at the close in 
New York in the biggest decline since Nov. 14. That pared the shares’ gain in the past year to 2.9 percent.
“We are aware of the event, and we are working with our customer,” said 
Marc Birtel, a spokesman at Boeing’s commercial headquarters in 
Seattle. 
Flight 008 
Flight
 008 arrived at Logan International Airport at 10:06 a.m. Boston time 
with 183 passengers and crew, Japan Airlines said in a statement. 
Everyone was off the plane when a mechanic observed smoke in the cockpit
 at 10:30 and alerted the fire department, Donahue said.
The 
blaze broke out under the cabin in an avionics bay that also houses 
batteries for the APU, said Richard Walsh, a spokesman for Massport, the
 airport operator.
Firefighters from Massport and the Boston Fire
 Department discovered smoke throughout the cabin and used hand-held 
infrared detection devices to locate the blaze, Donahue said.
It took about 20 minutes to extinguish the fire, using a gas called 
Halotron
 that displaces oxygen in electronics fires. Shortly afterward, there 
was a small explosion in the compartment that Donahue said probably came
 from a battery pack. A dry chemical powder was used to put that out, he
 said.
The 787 includes several lithium-ion rechargeable 
batteries to power electronics and other equipment, according to FAA 
records. The FAA imposed special conditions in 2007 on the use of 
lithium-based batteries because they are a greater fire hazard than 
other battery technologies. 
No Heat 
Lithium batteries burn violently and cannot be easily extinguished, according to FAA and NTSB tests.
The FAA said in 
rules
 published in the Federal Register that the batteries must be designed 
to prevent overheating. If a battery did fail, it should not release 
dangerous gases or damage nearby wiring, according to agency records.
Leake,
 the BB&T analyst, said any connection between yesterday’s incident 
and previous faults would mean that “the ante has been upped.”
“The
 system should always be designed to isolate, and you should never 
generate enough heat for a fire,” said Leake, who formerly worked at 
Canadian planemaker Bombardier Inc. He has a buy rating on Boeing.
There
 were no injuries yesterday, though one firefighter was evaluated for 
skin irritation, Donahue said. Airport firefighters had trained with 
Boeing on the Dreamliner, which familiarized them with the plane and 
made their work more efficient, he said. 
‘Introductory Squawks’ 
The
 plane that caught fire was delivered to Japan Airlines last month, the 
seventh 787 the carrier had received after getting its first in March. 
It still has another 38 on order, according to Boeing’s website.
In July, an engine component on a 787 intended for 
Air India fractured, spewing shards of metal and sparking a brushfire as the plane prepared for its first flight in 
South Carolina. The FAA ordered in December that Dreamliners be inspected after fuel leaks on two planes were traced to manufacturing errors.
Boeing
 Chief Executive Officer Jim McNerney has characterized the previous 
incidents on the 787 as “normal introductory squawks” for a new model.
The
 planemaker has delivered about 50 Dreamliners to eight customers since 
All Nippon received the first one in September 2011. Boeing is doubling 
the jet’s production rate this year to 10 a month to fill orders for 
about 800 Dreamliners, which are valued at about $225 million at the 
average list price.
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