scope:

PURPOSE

This John C. Stennis Space Center (SSC) standard (SSTD) provides a uniform method of assigning and affixing Specification Control Drawing (SCD) numbers and locator plates to mechanical components site-wide, as well as assigning and affixing identification (ID) numbers to pressure vessels and tanks site-wide. 

APPLICABILITY This standard applies to all SSC National Aeronautics and Space Administration (NASA) organizations, resident agencies, contractors and sub-contractors involved with assigning, affixing, modifying and maintaining the numbering system for components, pressure vessels, and tanks. This standard further applies to:

a. Newly installed mechanical components and existing mechanical components to which ID numbers have not been assigned;

b. Locator plates, which shall be used to identify components and pressure vessels/tanks site-wide; and,

c. Component locator or tank vessel ID numbers, which shall be used on Site-wide Operational and Repair Documents (SORD) drawings and related documentation.

NOTE: This standard does not apply to mechanical components with previously assigned ID numbers or to component locator plates that are in good condition but have a material, format, or mounting method different from that described in this standard.