eCFR
49 CFR 180.407 — Test and Inspection of Specification Cargo Tanks
The rule behind every periodic cargo tank test and inspection.
The section behind every periodic test and inspection a specification cargo tank has to pass to stay in service.
Open it when you’re scheduling tests, setting up a tank’s paperwork, or answering “is this one due?” It’s the section the rest of Part 180 keeps pointing back to.
eCFR is updated daily. Read the current text there, not a copy in a binder.