A Lubbock federal grand jury has indicted the suspended JetBlue captain whose midair meltdown prompted an emergency landing in Amarillo last month, according to court records released Thursday.

Clayton F. Osbon, 49, "moved through the aircraft and was disruptive and had to be subdued and forcibly restrained from re-entering the cockpit," the Wednesday indictment said.

Federal authorities charged Osbon, a 12-year JetBlue veteran, last month with one count of interference with a flight crew, court records show.

The charge carries a maximum prison sentence of 20 years.

JetBlue co-pilot Jason Dowd safely landed Flight 191 in Amarillo on March 27 after he locked Osbon out of the cockpit, according to court records.

The flight, which departed from New York with a scheduled destination of Las Vegas, became an emergency situation when Osbon began racing inside the cabin, pounded on the cockpit door and screamed about Sept. 11, 2001, and bombs, an FBI affidavit said.

None of the 141 passengers and crew members, who restrained Osbon at Dowd's request, was seriously hurt.

This month, U.S. District Judge Mary Lou Robinson ordered federal marshals to transport Osbon, of Richmond Hill, Ga., to an undisclosed federal medical center.

Prosecutors and E. Dean Roper, Osbon's attorney, agreed to a mental competency exam after a government motion said events described in a FBI affidavit "establish a likelihood that Osbon may be suffering from a mental disease or defect."

The exam will determine whether he understands the charge against him and can assist his attorney in a defense, according to Robinson's order.