Operators of Airbus A320neos with CFM International Leap-1A engines are likely to be told to inspect high-pressure turbine disks to check for possible defects.
The European Aviation Safety Agency says it is proposing the checks after a batch of second-stage disks were subjected to a "forging process deficiency" during manufacture.
EASA says the disks might, as a result, have undetected defects and a lower life capability.
This could result in an uncontained failure of the turbine disk.
CFM issued a service bulletin in late September detailing the inspection process for the disks, and EASA's proposal will require replacement of any affected component before it reaches 1,200 cycles.
EASA is inviting comments on the proposed directive until 10 November.
The Leap-1A is one of two powerplant options on the re-engined A320neo, competing with the Pratt & Whitney PW1100G.
EASA has not listed any similar proposal for Leap-1B engines, which are fitted to the Boeing 737 Max. The Leap-1B had been the subject of a low-pressure disk manufacturing concern earlier this year, which temporarily halted flight-testing of the Max.