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Originally published July 26, 2013 at 7:05 AM | Page modified July 26, 2013 at 3:01 PM

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United, ANA find wiring issues in 787 transmitters

United Airlines and Japan’s All Nippon Airways disclosed issues with the wiring on their Boeing 787’s emergency transmitters, the same part of the plane that is getting close scrutiny after a parked jet burned earlier this month.

The Associated Press

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Two airlines disclosed issues with the wiring on their Boeing 787’s emergency transmitters, the same part of the plane that is getting close scrutiny after a parked jet burned earlier this month.

United Airlines said Friday that it found a pinched wire during an inspection of one of its six 787s. Earlier, Japan’s All Nippon Airways found damage to wiring on two Boeing 787 locater beacons. It flies 20 of the jets.

The inspections were mandated by the Federal Aviation Administration for U.S. airlines after the tail of an Ethiopian Airlines 787 caught fire while parked at London’s Heathrow airport earlier this month. U.K. investigators said the only thing in the tail section with enough power to fuel a fire like that was the emergency transmitter. That’s a metal-cased, battery-operated radio the size of a loaf of bread that activates in a crash to help rescuers find a plane.

The FAA said last week it would require U.S. airlines to look for “proper wire routing and any signs of wire damage or pinching,” and to check the transmitter’s battery compartment for signs of heating or moisture. It issued a formal order on Thursday. The European Aviatoin Safety Agency issued its own order on Friday.

A wire could short-circuit if it’s pinched by metal and the metal cuts through the wire’s insulation, exposing the part that carries electricity.

United Continental Holdings spokesman Christen David said the transmitter with the pinched wire was removed and sent to its maker, Honeywell International. Inspections were carried out without any impact on United’s flight schedule, she said. That transmitter was replaced, and United has working transmitters on all of its 787s, she said.

Spokesmen for Honeywell International and Boeing both declined to comment, citing the ongoing investigation.

So far, the FAA and European orders have covered only787s. That’s Boeing’s newest plane, and only 68 have been delivered so far. But those particular transmitters are used on far more planes — U.K. investigators said they’ve been installed on some 6,000 aircraft.

The fire at Heathrow happened just when Boeing was hoping to get the 787 out of the news. In January, smoldering lithium-ion batteries on two 787s prompted authorities to ground the plane for almost four months, forcing Boeing to redesign the batteries and their chargers.

The grounding was costly for the eight airlines that flew the 787 at the time. Polish officials have said that LOT Polish Airlines — which is struggling and trying to reorganize its finances — lost some $30 million from canceled flights alone.

On Wednesday, Boeing CEO Jim McNerney acknowledged that the grounding created “some instances where we had obligations to customers, and those have all been satisfied.” A moment later he added, “We think they are all behind us now.”

LOT disagreed on Friday. In a statement, it said its demands “have not been compensated in any form” by Boeing. A Boeing spokesman did not have an immediate response to LOT’s assertion.

Associated Press reporter Monika Scislowska in Warsaw contributed to this report.

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