WASHINGTON — Some recently manufactured Boeing and Airbus jets have components made from titanium that was sold using fake documentation verifying the material’s authenticity, according to a supplier for the plane-makers, raising concerns about the structural integrity of those airliners.

The falsified documents are being investigated by Spirit AeroSystems, which supplies fuselages for Boeing and wings for Airbus, as well as by the Federal Aviation Administration. The investigation comes after a parts supplier found small holes in the material from corrosion.

In a statement, the FAA said it was investigating the scope of the problem and trying to determine the short- and long-term safety implications to planes that were made using the parts.

It is unclear how many planes have parts made with the questionable material.

“Boeing reported a voluntary disclosure to the FAA regarding procurement of material through a distributor who may have falsified or provided incorrect records,” the statement said. “Boeing issued a bulletin outlining ways suppliers should remain alert to the potential of falsified records.”

The revelation comes at a moment of intense scrutiny of Boeing and the broader aviation industry, which is reeling from a series of mishaps and safety issues.

In January, a door panel blew off a Boeing 737 Max 9 jet while it was in flight, prompting several federal investigations.

In April, Boeing told the FAA about a separate episode involving potentially falsified inspection records related to the wings of 787 Dreamliner planes. Boeing reported to the FAA that it might have skipped required inspections involving the jet’s wings and that it would need to reinspect some of the Dreamliners still in production.

On May 30, Boeing submitted a plan to the FAA outlining safety improvements it planned to make and committed to weekly meetings with the agency. Boeing CEO Dave Calhoun is set to testify Tuesday before a Senate panel on the company’s safety issues.

The use of potentially fake titanium, which has not been previously reported, threatens to extend the industry’s problems beyond Boeing to Airbus, its European competitor.

The planes that included components made with the material were built between 2019 and 2023, among them some Boeing 737 Max and 787 Dreamliner airliners as well as Airbus A220 jets, according to three people familiar with the matter who spoke on the condition of anonymity because they were not authorized to speak publicly.

It is not clear how many of those planes are in service or which airlines own them.

Spirit is trying to determine where the titanium came from, whether it meets proper standards despite its phony documentation, and whether the parts made from the material are structurally sound enough to hold up through the projected life spans of the jets, company officials said.

Spirit said it was trying to determine the most efficient way to remove and replace the affected parts if that ended up being necessary.