: Approval of the aircraft's design and components.
Since this is just one part of a larger set, it cannot be opened or reviewed as a standalone file without the other accompanying parts (e.g., part01 through part20). What is 14 CFR Part 21? DODIGV164.part21.rar
: If you are unsure of the source, use a checksum tool or an antivirus scanner. RAR files are commonly used for large data sets, but they can occasionally hide malicious scripts if downloaded from unverified repositories. Certification - Federal Aviation Administration : Approval of the aircraft's design and components