MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
Section I provides a general explanation of all maintenance and repair functions authorized at various
maintenance levels. It also provides an explanation of the contents of sections II, III, and IV.
Section II designates overall responsibility for the performance of maintenance functions on the identified end
item or components. The implementation of the maintenance functions upon the end item or component will be
consistent with the assigned maintenance functions.
Section III lists the special tools and test equipment required for each maintenance function as referenced from
Section IV contains supplemental instructions, explanatory notes, and/or illustrations required for a particular
C-2. Explanation of Columns in Section II (Maintenance Allocation Chart)
Group Number, Column (1). The functional group is a numerical group set up on a functional basis. The
applicable functional grouping indexes (obtained from TB 750-93-1, Functional Grouping Codes) are listed on the MAC in
the appropriate numerical sequence. These indexes are normally set up in accordance with their function and proximity
to each other.
Functional Group, Column (2). This column contains a brief description of the components of each functional
Maintenance Functions Column (3). This column lists the various maintenance functions (A through K) and
indicates the lowest maintenance category authorized to perform these functions. The symbol designations for the
various maintenance categories are as follows:
F-Direct support maintenance
H-General support maintenance
The maintenance functions are defined as follows:
Inspect: To determine serviceability of an item by comparing its physical, mechanical, and electrical
characteristics with established standards.
Test: To verify serviceability and to detect electrical or mechanical failure by use of test equipment.
Service: To clean, to preserve, to charge, to paint, and to add fuel, lubricants, cooling agents, and air.
Adjust: To rectify to the extent necessary to bring into proper operating range.
Aline: To adjust specified variable elements of an item to bring to optimum performance.
Calibrate: To determine the corrections to be made in the readings of instruments or test equipment used
in precise measurement. Consists of the comparisons of two instruments, one of which is a certified
standard of known accuracy, to detect and adjust and discrepancy in the accuracy of the instrument
being compared with the certified standard.
Install: To set up for use in an operational environment such as an emplacement, site, or vehicle.
Replace: To replace unserviceable items with serviceable assemblies, subassemblies, or parts.
Repair: To restore an item to serviceable condition. This includes, but is not limited to, inspection,
cleaning, preserving, adjusting, replacing, welding, riveting, and strengthening.
Overhaul: To restore an item to a completely serviceable condition as prescribed by maintenance
serviceability standards using the Inspect and Repair Only as Necessary (IROAN) technique.