The design and manufacture of the Boeing 787 Dreamliner has been declared safe by the US Federal Aviation Administration.
It had ordered a review of the new generation aircraft after battery problems grounded the entire fleet last year.
The FAA said some of Boeing’s suppliers did not follow industry standards for inspection that include training and testing requirement for inspectors.
But it said “effective processes” had been implemented to correct issues that arose during and after certification, the BBC reported.
“For manufacturing, early issues with suppliers implementing the new business processes are being addressed, and improvements are in progress throughout the supply chain,” according to the report, issued jointly by the FAA and Boeing’s critical systems review team.
It added that while some design issues had occurred, their causes tended to represent “individual escapes in the design or manufacture of the airplane”.
The report said “a certain number of such escapes are to be expected in the development of a complex product such as a large airplane, due to state-of-the-art limitations in current design, manufacturing, and certification processes”.