After completing an inspection of the emergency locator transmitter beacons on its fleet of nine Dreamliners, Japan Airlines Co. said it will continue using them on the aircraft.

The second-biggest Boeing Co. 787 operator found no faults with the ELTs after starting an inspection Friday, Taro Namba, a Tokyo-based spokesman at the carrier, said Monday. ANA Holdings Inc.'s inspection of the 20 Dreamliners in its fleet may not be completed till next week, company spokesman Ryosei Nomura said.

The U.S. Federal Aviation Administration said last week it is working with Chicago-based Boeing to develop instructions for ELT inspections as investigators probe reasons for a July 12 fire on one of the 787s in London. The U.S., which, unlike U.K. safety authorities, hasn't called for the deactivation of the beacon, said the checks will be made mandatory through an airworthiness directive to be issued "in the coming days."