Officials at the Japanese transport ministry have launched an investigation into what caused two fuel leaks on Dreamliner aircraft operated by Japan Airlines earlier this month.
The decision follows an announcement by the Federal Aviation Administration that it would launch a similar investigation.
In recent days, flights involving Dreamliners have been affected by an electrical fire and a brake problem among others incidents.
However, Boeing chief executive Jim McNerney insisted the planes were safe.
He said: “We stand 100 per cent behind the integrity of the 787 and the rigorous process that led to its successful certification and entry into service.
“We look forward to participating in the joint review with the FAA, and we believe it will underscore our confidence, and the confidence of our customers and the travelling public, in the reliability, safety and performance of the innovative, new 787 Dreamliner.”
At the weekend, the Japan Airlines Dreamliner jet undergoing checks after a fuel leak at Boston Airport again leaked fuel.
Of the 50 Dreamliners delivered to date, 24 of them are being operated in Japan by JAL and rival All Nippon Airways.