Japan identifies leaks, other 787 problems

TOKYO — Japanese authorities have identified the causes of fuel leaks and other problems with Boeing’s 787 but are still investigating the more serious battery problem that forced an emergency landing in January and the worldwide grounding of the jets.

An oil leak was caused by an improper paint job that led to a switch not working properly, while inadequate taping led to cracks in cockpit glass, and a faulty part led to braking problems, according to the Transport Ministry’s investigation released Friday into problems that occurred with the 787 Dreamliner in January.

The government issued orders to fix the problems with 787s operated by Japan Airlines and All Nippon Airways, the country’s two major carriers and the biggest customers for Boeing Co.’s new jet.

All 50 of the 787 jets in service around the world have been grounded for more than a month after a lithium-ion battery in a 787 operated by ANA overheated Jan. 16, forcing an emergency landing in western Japan. Earlier in January, a lithium-ion battery caught fire in a Japan Airlines 787 parked in Boston.

Boeing and U.S. authorities are also investigating, but Friday’s findings shed little light on the main problem.

The 787 is the first jet to extensively use lithium-ion batteries, which weigh less, charge faster and are more powerful than other kinds of batteries. Japanese manufacturer GS Yuasa makes the batteries for Boeing.

The aircraft manufacturer said earlier this week that it intends to propose to U.S. federal regulators a temporary fix for the batteries. The official who spoke on condition of anonymity did not disclose details.

A fix for the 787 batteries would require stopping an uncontrolled overheating reaction called “thermal runaway,” in which the battery gets hotter and hotter, and short-circuits spread from one battery cell to another.

The battery problems are not necessarily linked to their manufacturer and could come from the myriads of parts and systems connected to the battery.

Separately, the Japanese ministry said this week it had found the ANA jet’s auxiliary power unit had been erroneously wired to the main battery that overheated.

ANA, which has 17 Dreamliners in its fleet, and JAL, with seven, have had to cancel hundreds of flights over the 787 woes.

JAL and ANA have released plans for flights without the 787 through the end of March, but have not said what they plan to do in the long term. Both companies have said they are ready to seek compensation from Boeing.

More in Herald Business Journal

Health-care consumers need to take the lead, so get smart

David Russian, CEO of Western Washington Medical Group, writes our third essay about fixing health care.

Robots on Wall Street: Slow-footed regulators lose ground

Watchdogs have to figure out how to check computers running lightening-fast algorithms.

More business, more competition for Everett kidney dialysis center

Nonprofit Puget Sound Kidney Centers sees large for-profit competitors enter state market.

Molina Medical holds fall carnival for families in Everett

Molina Medical is hosting a free event for families in the Everett… Continue reading

Leadership Snohomish County celebrates 20 years of service

Leadership Snohomish County is celebrating its 20th anniversary. The organization was launched… Continue reading

Snohomish, Monroe manufacturers honored for innovation, excellence

Two Snohomish County companies have been honored with Manufacturing Excellence awards at… Continue reading

Remodeled home tours planned this weekend

This weekend, Edmonds-based Chermak Construction will participate in the 2017 Remodeled Homes… Continue reading

Barron Heating to celebrate anniversary at Marysville showroom

Barron Heating and Air Conditioning is celebrating its 45th anniversary from 10… Continue reading

US budget deficit hits $666B, an $80B spike for the year

The deficit issue has largely fallen in prominence in Washington in recent years.

Most Read