Pset_MaintenanceTriggerDuration Trigger levels for an asset that has an PPM based maintenance strategy. IfcElement IfcAsset IfcSystem IfcElement,IfcAsset,IfcSystem DurationTargetPerformance Target time to failure of the asset DurationMaintenanceLevel Duration interval at which maintenance is performed DurationReplacementLevel Duration interval at which replacement is performed DurationDisposalLevel Duration interval at which disposal is performed