MAINTENANCE ALLOCATION CHART
The purpose of the Maintenance Allocation Chart is to provide all activities with maintenance functions
to be performed at each level of maintenance.
a. Column 1. Group Number. Column 1 lists group numbers, the purpose of which is to identify
components, assemblies, subassemblies, and modules with the next higher assembly.
b. Column 2. Functional Group. Column 2 lists the noun names of components, assemblies, sub-
assemblies, and modules on which maintenance is authorized.
Column 3. Maintenance Functions. Maintenance functions will be limited to and defined as fol-
(1) Inspect. To determine serviceability of an item by comparing its physical, mechanical, and
electrical characteristics with established standards.
(2) Test. To verify serviceability and to detect electrical or mechanical failure by use of test
(3) Service. To clean, to preserve, to charge, and to add fuel, lubricants, cooling agents and air.
If it is desired that elements, such as painting and lubricating, be defined separately, they may be so list-
(4) Adjust. To rectify to the extent necessary to bring into proper operating range.
(5) Align. To adjust specified variable elements of an item to bring to optimum performance.
(6) Calibrate. To determine the corrections to be made in the readings of instruments or test
equipment used in precise measurement. Consists of the comparison of two instruments, one of which is
a certified standard of known accuracy, to detect and adjust any discrepancy in the accuracy of the in-
strument being compared with the certified standard.
(7) Install. To set up for use in an operational environment such as an emplacement, site, or ve-
(8) Replace. To replace unserviceable items with serviceable assemblies, subassemblies, or par-
(9) Repair. To restore an item to serviceable condition. This includes, but is not limited to, in-
spection, cleaning, preserving, adjusting, replacing, welding, riveting, and strengthening.
(10) Overhaul. To restore an item to a completely serviceable condition as prescribed by main-
tenance serviceability standards prepared and published for the specified item to be overhauled.
(11) Rebuild. To restore an item to a standard as nearly as possible to original or new condition
in appearance, performance, and life expectancy. This is accomplished through complete disassembly of
the item, inspection of all parts or components, repair or replacement of worn or unserviceable elements
(items) using original manufacturing tolerances and specifications and subsequent reassembly of the