BEIJING — A United States Navy warplane crashed into the sea northeast of the Philippines on Monday, the second crash in less than a month involving aircraft from the carrier the U.S.S. Ronald Reagan.

The aircraft, an F/A-18 Super Hornet, had a mechanical problem during routine operations over the Philippine Sea in the Western Pacific, the Navy’s Seventh Fleet said in a statement. In October, an MH-60 Seahawk helicopter, also assigned to the Ronald Reagan, crashed shortly after takeoff, injuring a dozen sailors.

The two aviators in the jet on Monday were plucked from the sea and brought back to the carrier in good condition, the Navy said.

The crash was the latest mishap for the Seventh Fleet, the largest American fleet deployed overseas, and a moment of reckoning for the Hornet.