ANA Holdings Inc. (9202.TO, ALNPY) said Friday that its All Nippon Airways Co. unit found "small damage" to the coated wires in two Boeing 787 Dreamliner emergency locator transmitters, as Europe's air-safety regulator joined its U.S. and Japanese counterparts in recommending inspections of the devices.

ANA's discovery came as a spokeswoman for Qatar Airways said one of its 787s had experienced what she called a "minor issue." She declined to comment further. The Qatar Airways 787 hasn't flown since Sunday, according to flight tracking website Flightradar24, which is an unusually long rest for a new airplane. A Boeing Co. (BA) spokesman referred questions to Qatar Airways.

All Nippon Airways said it found the wiring damage in an inspection following a fire earlier this month on an Ethiopian Airlines 787 parked at London's Heathrow Airport. British investigators are examining the emergency transmitter as a possible cause of the July 12 fire, which caused significant damage in the ceiling of the jet. The transmitters, known as ELTs, are used to find a jet in the event of a crash.

The Federal Aviation Administration issued a directive Thursday instructing U.S. Dreamliner operators to remove or inspect ELTs in response to the London accident, following recommendations by the U.K. investigators into the Heathrow fire. Japan's transport ministry followed suit, issuing similar instructions, and on Friday the European Aviation Safety Agency followed with its own matching recommendation.

Boeing has delivered 70 Dreamliners to global operators since 2011. ANA and Japan Airlines Co. had already started their own inspections ahead of the guidance from regulators. ANA said it completed checking of its ELTs, while JAL said the work on its 10 Dreamliners is expected to be completed by Sunday.

ANA, the world's biggest operator of Boeing 787s, with 20 in its fleet, found damage to the rubber covering the battery wires of one of the 787's ELTs, and one replacement unit not aboard an aircraft. ANA removed eight ELTs from Dreamliners used on Japanese domestic flights, as well as inspecting the replacements. ANA will report the damage to Japan's transport ministry and to the equipment maker, Honeywell International Inc., an ANA spokesman said. It was unclear whether the finding was related to the fire aboard the Ethiopian Airlines 787, the spokesman said.

Spokesmen for European 787 operators Norwegian Air Shuttle SA, LOT Polish Airlines, Thomson Airways, a unit of TUI Travel PLC and British Airways, a unit of International Consolidated Airlines Group SA, say that they have removed the ELTs from their aircraft. LOT and Norwegian said the units weren't found to be damaged and LOT and British Airways didn't detail their findings.

"We await updates from the aircraft manufacturer before we take further action," British Airways said in a statement.

United Continental Holdings Inc., the only U.S. operator of the 787 with six in its fleet, didn't immediately respond to a request for comment.

Separately, a person familiar with the situation said that an incident on Thursday in which an Air India Ltd. 787 experienced smoke from an overheating galley oven during an Indian domestic flight was traced to an item left cooking for too long.

--Marietta Cauchi and Dan Michaels contributed to this article

Write to Jon Ostrower at jon.ostrower@wsj.com and Yoshio Takahashi at yoshio.takahashi@wsj.com

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