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This notification Save as otherwise provided in these rules, they shall come into force on date of their final publication in gazette. In the Central Motor Vehicles Rules, 1989 (hereinafter referred to as the said rules), after rule 115-AA, the Following rule shall be inserted, namely: “115AB. Mass emission standards for CNG, Bio-CNG, LNG driven agriculture tractors, power tillers, Construction equipment vehicles and combine harvesters.- For conversion by modification of engines of In-use Diesel Vehicle. Replacement of In-use Diesel Engine by New dedicated CNG/ Bio-CNG/LNG Engine. Explanation:- The mass emission test shall be carried out on engine dynamometer, as applicable. Vehicles offered for type approval to the testing agency referred in rule 126 shall have to comply with fitness requirement, as applicable under these rules. Test procedure and safety guidelines for such CNG/Bio-CNG/LNG vehicles, kit component including installation thereof shall be as per AIS 024, AIS 028 (rev.1) as amended from time to time, till such time as Corresponding BIS specification are notified. The test agency shall complete the test and give necessary certificate within three months of the same being submitted for test. Testing agencies will be required to indicate specifically, the models and their variants on which the Replacement of new engine will be valid.”