Hydrostatic test
A pressure test used to determine the serviceability of high-pressure oxygen cylinders. The cylinders are filled with water and pressurized to 5⁄3 of their working pressure. Standard-weight cylinders (DOT 3AA) must by hydrostatically tested every five years, and lightweight cylinders (DOT 3HT) must be tested every three years.
Aviation Maintenance Technician Handbook — Airframe, p. G-19
Taught in AF-G Procedures, AF-M Concepts, AF-M Procedures, PP-E Concepts, PP-E Procedures.