在MRO市场上CFM56和V2500等畅销发动机系列中的二手可用航材(USM)短缺状况在未来18-24个月内不太可能缓解。The challenge of used serviceable materials (USM) shortages on in-demand engine families such as the CFM56 and the V2500 isn’t likely to alleviate over the next 18-24 months.