APPENDIX II
MAINTENANCE ALLOCATION CHART
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Section I. EXPLANATION OF MAINTENANCE FUNCTIONS
1. General
This appendix contains a maintenance allocation chart listing all maintenance and repair operations
authorized for the various echelons.
2. Maintenance
Maintenance is any action taken to keep material in a serviceable condition or to restore it to serviceability
when it is unserviceable. Maintenance of material includes the following:
b. Adjust. To regulate periodically to prevent malfunction.
c. Inspect. To verify serviceability and to detect incipient mechanical failure by scrutiny.
d. Test. To verify serviceability and to detect incipient mechanical failure by use of special equipment
such as gages, meters and so on.
e. Replace. To substitute serviceable assemblies, subassemblies, and parts for unserviceable
components.
f. Repair. To restore an item to serviceable condition through correction of a specific failure or
unserviceable condition. This function includes but is not limited to, inspection, cleaning, preserving,
adjusting, replacing, welding, riveting, and straightening.
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 of 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.
3. 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 normally
are 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 name. It also designates the operation
to be performed such as service, adjust, inspect, test, replace, repair, and overhaul.
c. Levels of Maintenance.
Column 1, operator. Operator maintenance is that maintenance performed by user or operator of the
equipment, such as servicing, cleaning, lubricating, and limited adjustments. It also includes removal and
replacement of items to accomplish servicing and lubrication.
Column 2, organizational. Organizational 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, Direct support. Direct support maintenance is that maintenance performed by specially trained
units in direct support of the using organization, such as replacement of all
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