TM 55-1730-201-12
APPENDIX B
MAINTENANCE ALLOCATION CHART
1. PURP05E.
The purpose of the maintenance allocation chart is to provide all activities with maintenance functions
to be performed at each level of maintenance.
2. DEFINITIONS.
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, subassemblies,
and modules on which maintenance is authorized.
c. Column 3, maintenance functions. Maintenance functions will be limited to and defined as follows:
(1) lnspect. To determine serviceability of an item by comparing its physical, mechanical, and elec-
trical characteristics with established standards.
(2) Test. TO verify serviceability and to detect electrical or mechanical failure by use of test equipment.
(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 listed.
(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 instrument being
compared with the certified standard instrument.
(7) install. To set up for use in an operational environment such as an emplacement, site, or vehicle.
(8) Replace. To replace unserviceable items with serviceable assemblies, subassemblies, or parts.
(9) Repair. To restore an item to serviceable condition. This includes, but is not limited to, inspection,
cleaning, preserving, adjusting, replacing, welding, riveting, and strengthening.
(10) Overhaul. To restore an item to a completely serviceable condition as prescribed by maintenance
serviceability standards prepared and published for the specific item to be overhauled.
(11) Rebuild. To restore an item to a standard as nearly as possible to original or new condition in ap-
pearance, 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 item.
(12) Symbols. The symbol O, F, H, or D placed in the appropriate column indicates the level responsible
for performing that particular maintenance function. The symbol “%%” which applies to organizational main-
tenance indicates that the particular maintenance function may be performed, provided it is specifically
authorized by the direct support maintenance officer. Use of the symbol will apply only to replacement of
major assemblies and time-consuming operations which are within the capabilities of organization, but over
which control by the commodity commands is considered essential. In no case will the direct support main-
tenance officer require the accomplishment of a “%%” maintenance function by an organization or unit, and
in no case will a “%%” function authorize stockage of parts at organizational level.
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