Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:13:p24
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 13 (pt 24/27)
Character Range: 703638–706775

additive deterioration factors.
              3.7. Application of deterioration factors
              3.7.1. The engines shall meet the respective emission limits for each pollutant, as given in paragraph 5.3. of this Regulation, after application of the deterioration factors to the test result as measured in accordance with Annex 4 (egas, ePM). Depending on the type of deterioration factor (DF), the following provisions shall apply:
              (a) Multiplicative: (egas or ePM) * DF ≤ emission limit;
              (b) Additive: (egas or ePM) + DF ≤ emission limit.
              3.7.2. The manufacturer may choose to carry across the DFs determined for an engine after treatment system family to an engine system that does not fall into the same engine-after-treatment system family. In such cases, the manufacturer shall demonstrate to the Type Approval Authority that the engine system for which the after-treatment system family was originally tested and the engine system for which the DFs are being carried across have the same technical specifications and installation requirements on the vehicle and that the emissions of such engine or engine system are similar.
              3.7.3. The deterioration factors for each pollutant on the appropriate test cycle shall be recorded in paragraphs 1.4.1. and 1.4.2. of the Addendum to Annex 2A and in paragraphs 1.4.1. and 1.4.2. of the Addendum to Annex 2C.
              3.8. Checking of conformity of production
              3.8.1. Conformity of production for emissions compliance shall be checked on the basis of the requirements of paragraph 8. of this Regulation.
              3.8.2. The manufacturer may choose to measure the pollutant emissions before any exhaust after-treatment system at the same time as the type approval test is being performed. In doing so, the manufacturer may develop an informal deterioration factor separately for the engine and the after-treatment system that may be used by the manufacturer as an aid to end of production line auditing.
              3.8.3. For the purposes of type approval, only the deterioration factors according to paragraphs 3.5. or 3.6. shall be recorded in paragraphs 1.4.1. and 1.4.2. of the Addendum to Annex 2A and paragraphs 1.4.1. and 1.4.2. of the Addendum to Annex 2C.
4. Maintenance
               For the purpose of the service accumulation schedule, maintenance shall be performed in accordance with the manufacturer's manual for service and maintenance.
              4.1. Emission-related scheduled maintenance
              4.1.1. Emission-related scheduled maintenance for purposes of conducting a service accumulation schedule shall occur at the same distance or equivalent intervals to those that will be specified in the manufacturer's maintenance instructions to the owner of the engine or vehicle. This maintenance schedule may be updated as necessary throughout the service accumulation schedule provided that no maintenance operation is deleted from the maintenance schedule after the operation has been performed on the test engine.
              4.1.2. The engine manufacturer shall specify