AIS‑024 (Revision 1) Part A and AIS‑028 (Revision 1) Part A collectively define the safety, procedural, and code-of-practice standards for the type approval and safe use of gaseous—such as CNG, Bio‑CNG, LNG—fuel systems in internal combustion engine vehicles used in automotive applications. These Indian regulations, forming Part A for automotive use, establish mandatory requirements for design, fuel storage, distribution, leak prevention, and installation to ensure operational safety and environmental compliance. The specified Amendments Nos. 1 through 4 provide incremental updates refining testing protocols, documentation, and conformity criteria. Critical for homologation and compliance under CMVR, these standards enhance public safety and support uniform regulatory adoption across manufacturers.