FAA finds Boeing Dreamliner could lose all power, issues maintenance mandate

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NEW: Boeing says airlines have done what they need to do and have a "go-forward plan"

The FAA orders "a repetitive maintenance task" on Boeing 787 Dreamliners due to issue

The Dreamliner has been plagued by battery problems; its fleet was grounded in part of 2013

CNN  — 

American Airlines will launch its 787 Dreamliner service Thursday, a few days after a recent Federal Aviation Administration order related to its power supply.

The Federal Aviation Administration on Friday issued a directive mandating “a repetitive maintenance task” for that model of airliner due to issues with its power supply. Specifically, the FAA explained testing revealed that 787s could lose all AC electrical power after being continuously powered for 248 days, a problem that, if left unchecked, would leave an aircrew unable to control the plane.

The order took effect immediately, with the federal agency finding that there’s no good reason to delay the decision.

“The FAA has found that the risk to the flying public justifies waiving notice and comment,” the agency said.

The maintenance mandate was characterized as temporary, until software is developed to resolve the problem.

A Boeing spokesman said its customers learned about this issue and what they need to do to fix it about two weeks before the FAA’s announcement. In fact, “all operators have already completed the off-cycle on fix,” said spokesman Doug Alder Jr.

“All of the airlines have completed the steps they need to take at the moment,” Alder added, “and they have a go-forward plan.”

The FAA’s power supply directive marks the latest setback for Boeing over its 787 Dreamliner, which debuted in 2011 in Asia and a year later in the United States amid much fanfare.

Yet the Dreamliner’s development was marred by production delays and other problems. And there have been issues since the fleet rolled out, including two instances of overheating batteries on a Japan Airlines plane in Boston and an All Nippon Airways jet in Japan.

Those cases prompted the grounding of Boeing’s global 787 fleet, with the FAA announcing in January 2013 that “before further flight, operators … must demonstrate … that the batteries are safe and in compliance.”

By April of that year, the FAA cleared Boeing to make fixes to its battery system, paving the way for the aircraft to resume flying.

Still, problems persisted. This includes reports in January 2014 of smoke on a Dreamliner at Tokyo’s Narita International Airport – an incident Boeing said then “appears to have involved the venting of a single battery cell.”

The National Transportation Safety Board issued a report 11 months later blaming the battery problem on the overheating from an electrical short circuit that may have been caused by manufacturing defects and allegedly unsatisfactory oversight of the manufacturing process by both the FAA and Boeing.

Those cases prompted the grounding of Boeing’s global 787 fleet, with the FAA announcing in January 2013 that operators had to demonstrate that the batteries were safe and in compliance before any further flights would be allowed.

CNN’s Thom Patterson contributed to this report.