You can find the official PDF through GovInfo or the Federal Register archive. Option 2: IATA Lithium Battery Guidance
Standards for FlexRay-based vehicle network systems. Download 21681 pdf
The 2026 edition is the latest for the 67th Edition of the IATA Dangerous Goods Regulations (DGR). You can find the official PDF through GovInfo
Technical standards like 21681 are frequently updated; ensure you have the version currently in effect (e.g., the 2026 IATA guidance). Download 21681 pdf
This is the most likely match for a specific document download search. is a rule published by the Federal Aviation Administration (FAA) .