United Technologies has cited an assembly error at its service centre for the wiring problems related to the fire extinguisher systems on certain Boeing 787s.
"An assembly error in our service centre impacted a limited number of refurbished fire extinguisher bottles," the supplier's aerospace systems division says. "This error has been corrected and we are working with Boeing and the airlines to complete the necessary inspections, which we expect will be completed over the next few days."
The wiring issue was discovered aboard an All Nippon Airways (ANA) 787 (registration JA813A) on 14 August. The fault was found on two additional ANA 787s following inspections by the airline.
The extinguisher controls for the left and right Rolls-Royce Trent 1000 engines were crossed, aboard the ANA 787s.
United Airlines said that it has inspected all seven of its 787s and found no issues, in an employee newsletter on 18 August.