Reuters (2/14) reports that an FAA airworthiness directive warns that Pratt & Whitney PW-1100 engines used aboard the Airbus A320neo “pose a potential shutdown risk.” The FAA’s warning follows “similar action by European regulators,” and cites a “knife edge seal fracture” in the engines that could lead to engine stall “and consequent inflight shutdown and rejected takeoffs,” the FAA said in an airworthiness directive.