g. Overhaul. To restore an item to completely serviceable condition as prescribed by-serviceability standards
developed and published by heads of technical services. This is accomplished through employment or the technique of
"Inspect and Repair only as Necessary" (IROAN). Maximum utilization of diagnostic and test equipment is combined with
minimum disassembly of the item during the overhaul process.
Explanation of Columns
a. Functional Group. The functional group is a numerical group set up on a functional basis. The applicable
functional grouping indexes are taken from the Corps of Engineers functional grouping indexes, and appear on the
maintenance allocation chart in their correct numerical sequence. These indexes are normally set up according to their
proximity to each other and their function.
b. Components and Related Operation. This column contains the functional index grouping heading, subgroup
headings, and a brief description of the part starting with the noun name. It also designates the operation to be performed
such as service, adjust, inspect, test, replace, repair, and overhaul.
c. Echelon Maintenance.
Column 1, First Echelon. First echelon maintenance is that maintenance performed by the user or operator
of the equipment, such as servicing, cleaning, lubricating, and limited adjustments. It also includes