safety-class-of-partsPart number/serial numberrequired Finished parts: parts, composite parts, modulesSafetyclass ofthe parts1A1C2S2B/S2B/L2L2R2NCritical rotating parts with limited life spans (cyclical, LCF/thermal fatigue and/or creep). Failure can result ina direct or indirect immediate danger to the aircraft(hazardous effect).YesYesYesYesYesYesNoNoNoCritical rotating and static parts without limited life spans. Failure can result in a direct or indirect serious danger to the aircraft (hazardous effect).Parts that, if they fail, have serious consequences (major effects) for the engine performance and operating safety. Blades that, if they fail, have serious consequences (major effects) for the engine performance and operating safety. Parts that, if they fail, have serious consequences (major effects) for the engine performance and functioning. However, forfinancial or organizational reasons, they do not receivea part number. Parts in the testing stage with a life span that is still unknown and for financial reasons, experience values must still be determinedafter final testing.Important: This table only contains suggestions. Fundamentally, currentspecifications must be consulted and observed.Testing specimens for testing rigs, the run times of which mustbe monitored.Parts that do not receive part numbers for financial reasons orspatial constraints (bulk goods, e.g. bolts). In exceptional cases,markings can be applied to ensure traceability.NotclassifiedParts that do not seriously compromise engine performanceor reliability if they fail.Parts subject to long-term monitoring.