The FAA and CFM International, the manufacturer of the CFM56 engines, both called on Friday for ultrasonic inspections within 20 days of engines with at least 30,000 cycles — or takeoffs and landings. Such engines typically are about 20 years old and the FAA said its order would apply to 352 engines on planes flown in the United States and 681 engines flown worldwide by various carriers.

Source: Los Angeles Times April 23, 2018 19:56 UTC