根据启动试验结果和大修检查发现的问题，介绍了转子复速级第二列复环局部严重磨损的情形。
Recounted friction loss circumstance on parts of the second-row shroud-ring in the Curtis stage for N12 turbine's rotor.
检查飞机机械师进行维护，修理和大修或改装飞机和飞机机械系统的工作，以确保遵守标准和程序。
Inspect work of aircraft mechanics performing maintenance, repair and overhaul, or modification of aircraft and aircraft mechanical systems to ensure adherence to standards and procedures.
因此，在大修和部件维护时，检查表面损伤状况很有必要。
Therefore, surface damage detection is important during overhaul and on components in service.
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