removal and replacement of items to accomplish servicing and lubrication.
Column 2, Second Echelon. Second echelon maintenance is that maintenance performed by trained
personnel provided for that purpose in the using organization, such as replacement of all items in
column 2, limited parts fabrication from bulk material, adjustments, and repair of assemblies,
components, and end items that can be accomplished without extensive disassembly.
Column 3, Third Echelon. Third echelon maintenance is that maintenance performed by specially trained
units in direct support of the using organization, such as replacement of all items in columns 2 and 3,
repair assemblies, components, and end items, and fabricate parts from bulk material.
Column 4, Fourth Echelon. Fourth echelon maintenance is that maintenance performed by units organized
as semifixed or permanent shops to serve lower echelon maintenance within a geographical area, such
as replacement of items in columns 2, 3, and 4, repair end items, overhaul assemblies and components,
and fabricate general use common hardware and parts.
Column 5, Fifth Echelon. Fifth echelon maintenance is that maintenance authorized to overhaul assemblies,
components,
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