The plane had a new problem Wednesday when the Japanese carrier All Nippon Airways cancelled a domestic flight after a computer on board erroneously showed problems with the aircraft’s brakes. A spokeswoman for the airline, Megumi Tezuka, said the computer glitch was similar to one that appeared when the carrier first started flying the Dreamliners in 2011.

The flight NH698 had been due to depart from Yamaguchi Ube airport in southern Japan for Tokyo’s Haneda airport at 4:50 p.m. local time. The flight’s 98 passengers were transferred to a later flight.

On Tuesday, a fuel leak forced a 787 to return to its gate minutes before taking off from Boston. On Monday, an electrical fire had broken out on another plane. Both of those incidents affected planes operated by Japan Airlines at Logan International Airport in Boston.

The three events were the latest in a series of problems with the 787, which entered commercial service in November 2011 and has had technical and electrical malfunctions since then. Boeing delivered 46 planes last year, more than any analyst had predicted, and has outlined ambitious plans to double its production rate to 10 planes a month by the end of this year.

Boeing expects to sell 5,000 of the planes in the next 20 years. The basic model has a list price of $206.8 million, but early customers typically received deep discounts to make up for the production delays and teething problems. All this means it could be years before Boeing starts recouping its investment costs and turning a profit on the planes.

Shares of Boeing dropped 2.6 percent to $74.13 Tuesday, extending the drop of 2 percent Monday.

The 787 makes extensive use of new technology, including a bigger reliance on electrical systems, and is built mostly out of lightweight carbon composite materials. While the problems so far do not point to serious design problems with the airplane, they represent an embarrassment to Boeing’s manufacturing ability.

“None of this is a showstopper, and none of this should signal this product is fundamentally flawed,” said Richard Aboulafia, an aerospace analyst at the Teal Group, a consulting firm. “But whether these are design glitches or manufacturing glitches, either way it’s a serious hit to Boeing’s image.”

The fuel leak Tuesday was spotted by another pilot as JAL Flight 007, bound for Tokyo, was taxiing and getting ready to take off, said Richard Walsh, a spokesman for the Massachusetts Port Authority. The plane was towed back to its gate and the leak of about 40 gallons, or about 150 liters, was cleaned up.

The flight with 178 passengers and 11 crew members, scheduled to take off at noon, eventually left Boston at 3:47 p.m.

An electrical fire Monday on a 787 was traced to a battery connected to the plane’s auxiliary power unit, which runs electrical systems when the plane is not getting power from its engines.

The fire broke out about 30 minutes after the flight landed from Tokyo, and all 183 passengers and crew members had left. The smoke was first detected in the cabin by maintenance and cleaning personnel who were on the parked plane and notified the airport’s fire department.

The National Transportation Safety Board, which is investigating the electrical fire, said the battery had “severe fire damage.”

New planes often experience problems in the first few years of production. But the succession of issues with the 787, which has already been marred by production delays of years, has revived concerns about the plane’s reliability and safety.

Last month, the Federal Aviation Administration ordered inspections of fuel line connectors on all 787s, warning of a risk of leaks and fires. Separately, a United Airlines 787 was also diverted in December after one of six electrical generators failed in flight.

In a statement Tuesday, Boeing said that it saw no relationship between the battery problem and previous incidents with the 787’s power system, which involved faults in power panels elsewhere in the electrical equipment bay.

“Boeing is cooperating with the N.T.S.B. in the investigation of this incident,” the company said. “Before providing more detail, we will give our technical teams the time they need to do a thorough job and ensure we are dealing with facts, not speculation.”

A Boeing spokesman, Marc Birtel, said the plane maker was aware of the fuel leak incident but declined to comment.

A spokeswoman for Japan Airlines in Tokyo said that the company was still gathering the details about the two incidents and that there were no plans to change its orders for 787s. The airline has seven 787s already in service, and 38 more on order. The spokeswoman declined to be named, citing company policy.

All Nippon Airways, which also operates Dreamliners, likewise said there were no plans to change its orders for the aircraft. Ms. Tezuka, the spokeswoman for ANA, said the airline had 17 787s in service and another 49 on order.

United Airlines, currently the only airline in the United States operating 787s, said it had performed inspections on all six of its 787s after the electrical fire Monday. It did not cancel any of its flights today, said Mary Ryan, a spokeswoman for the airline. She said United “continues to work closely with Boeing on the reliability of our 787s.”

But she declined to comment on a report in The Wall Street Journal that said the airline had found improperly installed wiring in components associated with the auxiliary power unit.

Bettina Wassener reported from Hong Kong.

Article source: http://www.nytimes.com/2013/01/10/business/global/safety-of-boeing-787-dreamliner-called-into-question.html?partner=rss&emc=rss