United Airlines said on Friday that it found a pinched wire during an inspection of one of its six 787’s. 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 (FAA) for US airlines after the tail of an Ethiopian Airlines 787 caught fire while parked at London's Heathrow airport earlier this month. UK investigators said that 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 that it would require US airlines to look for proper wire routing and any signs of wire damage or pinching. And also to check the transmitter's battery compartment for signs of heating or moisture. It issued a formal order on Thursday. The European Aviation 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 Inc. spokesman Christen David said the transmitter with the pinched wire was removed and sent to its maker, Honeywell International Inc. that transmitter was replaced, and United has working transmitters on all of its 787s, she said.

Spokesmen for Honeywell International Inc. and Boeing Co. both declined to comment, citing the ongoing investigation. So far, the FAA and European orders have only covered 787s.

That is Boeing's newest plane, and only 68 have been delivered. But those particular transmitters are used on far more planes. UK 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 USD 30 million from canceled flights alone.


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