A fire onboard a B787 test aircraft has forced Boeing to temporarily suspend test flights while it determines the cause of the problem. Boeing confirmed it does not know how long the suspension will remain in place and has not determined the impact on the aircraft’s delivery schedule. Boeing is still working through a slew of issues with the B787, including Rolls-Royce engine availability, workmanship challenges at Alenia Aeronautica and supply chain problems related to aircraft interiors. Boeing shares fell 3.2% yesterday, while shares in rival EADS rose 2.9%.