MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
This Appendix contains explanations of all maintenance and repair functions authorized for the various echelons.
Section II contains the maintenance allocation chart.
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:
a. Service. To clean, preserve, and replenish fuel and lubricants.
b. Adjust. To regulate periodically to prevent malfunction.
Inspect. To verify serviceability and detect incipient electrical or mechanical failure by scrutiny.
d. Test. To verify serviceability and detect incipient electrical or mechanical failure by use of special equipment
such as gages, meters, and the like.
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, inspecting, cleaning, preserving, adjusting, replacing, welding,
riveting, and straightening.
To adjust two or more components of an electrical system so that their functions are properly
h. Calibrate. To determine, check, or rectify the graduation of an instrument, weapon, or weapons system, or
components of a weapons system.
i. 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 (obtained from the Mobility Command functional grouping indexes) are listed on the
maintenance allocation chart in the appropriate numerical sequence. These indexes normally are set up in accordance
with their function and proximity to each other.
b. Components and Related Operation. This column contains the Functional Grouping Index heading, subgroup
headings, and a brief description of the part starting with the noun name. It also designates the operations to be
performed such as service, adjust, inspect, test, replace, repair, and overhaul.
c. Echelons of Maintenance. This column contains the various echelons of maintenance by number designation.
An X placed in the appropriate echelon column and in line with an indicated maintenance function authorizes that
echelon to perform the function. The X indicates the lowest echelon responsible for per-