MIL-HDBK-1899, DEPARTMENT OF DEFENSE HANDBOOK, PRESSURE TESTING, 10 PSI THROUGH 200 PSI (27 MAR 1998) [SUPERSEDING MIL-STD-1899(AT)]., This standard covers the classifications, requirements, and procedures for air or hydraulic leak testing of castings, parts, or assemblies at 10 through 200 pounds per square inch gage (psig) by using the appropriate documents listed below.