Boeing, already under stress over the failings of its 737 MAX planes, is now being investigated over allegations of "shoddy" work on its 787 Dreamliner range.
The Seattle Times reports the US Department of Justice is looking into claims the aerospace company has been cutting corners at its plant in North Charleston, South Carolina.
Allegations include faulty work being signed off to avoid delivery delays, and a work culture that prizes speed over quality.
Subpeonas have been issued to staff at the plant, the Times reported.
- Boeing CEO admits mistakes were made in first interview since MAX 8 crashes
- Boeing reveals it knew of 737 MAX 8 issue before fatal crashes and didn't tell FAA
The DOJ is already investigating Boeing after two of its 737 MAX planes were involved in fatal crashes - Lion Air flight JT610 (189 dead) and Ethiopian Airlines flight ET302 (157 dead).
Wheel and braking faults have recently emerged in some of the Dreamliners.