US Air Force has a fix for two major KC-46 problems February 1 A F-16 flown by Maj Spencer Bell, 40th Flight Test Squadron test pilot, receives fuel from a KC-46 Pegasus, above, during a flutter mission at Eglin Air Force Base, Fla., on Dec. 12, 2019. (Tech. Sgt. John Raven/U.S. Air Force) WASHINGTON — Two of the KC-46 aerial refueling tanker’s major technical problems may be in the rearview mirror. The U.S. Air Force on Feb. 1 announced it closed one of the Boeing-made aircraft’s six category 1 deficiencies — which indicate problems that impact operations or pose a safety risk — and downgraded another to the lesser category 2 status.