The American aircraft manufacturer Boeing has new problems with its 787 Dreamliner.
As a company spokesman told the AFP news agency on Thursday, a supplier informed Boeing that some components had been "improperly manufactured".
Aircraft that have not yet been delivered should therefore be revised.
However, Boeing does not assume that there is a safety risk with machines that have already been delivered.
Possible future steps would be in coordination with the US air traffic control authority FAA.
The Wall Street Journal had initially reported on the new problem with the long-haul aircraft.
According to this, certain components made of titanium that had been installed in the past three years were “weaker than they should be”.
Boeing stopped deliveries of the 787 in May due to a number of problems.
In July, the group reported further necessary improvements.
According to the FAA, it was about a "manufacturing quality problem near the aircraft nose of certain 787 Dreamliners".
The Wall Street Journal also reported that the regulator is investigating a number of potential issues with Boeing's quality control.
The aircraft manufacturer did not want to comment on that.
In the past, Boeing had plunged into a deep crisis when two 737 MAX aircraft crashed.