“This is about titanium that has entered the supply system via documents that have been counterfeited. When this was identified, all suspect parts were quarantined and removed from Spirit production,” the company said in a statement.

Spirit added that “more than 1,000 tests have been completed to confirm the mechanical and metallurgical properties of the affected material to ensure continued airworthiness.”

“Boeing reported a voluntary disclosure to the FAA regarding procurement of material through a distributor who may have falsified or provided incorrect records,” the FAA said in a statement confirming yet another investigation into Boeing.