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TM 55-4920-400-13
APPENDIX B
MAINTENANCE ALLOCATION CHART
B-1. Purpose. The purpose of the Maintenance
Allocation Chart is to provide all activities with
maintenance functions to be performed at each
level of maintenance.
B-2. Definitions.
a. Column 1, Group Number. Column 1 lists
group numbers, the purpose of which is to identify
components, assemblies, subassemblies and mod-
ules 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. C o l u m n 3 , M a i n t e n a n c e F u n c -
tions. Maintenance functions will be limited to and
defined as follows:
(1) Inspect. To determine serviceability of an
item by comparing its physical, mechanical, and
electrical characteristics with established stan-
dards.
(2) Test. To verify serviceability and to detect
electrical or mechanical failure by use of test equip-
ment.
(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 ele-
ments 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 measurements. Consists
of the comparison to 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 stan-
dard.
(7) Install. To set up for use in an operational
environment such as an emplacement, site, or vehi-
cle.
(8) Replace. To replace unserviceable items
with serviceable assemblies, subassemblies, or par-
ts.
(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 com-
pletely serviceable condition as prescribed by main-
tenance serviceability standards prepared and pub-
lished for the specific item to be overhauled.
(11) Rebuild. To restore an item to a stan-
dard as nearly as possible to original or new condi-
tion in appearance, performance, and life ex-
pectancy. This is accomplished through complete
disassembly of the item, inspection of all parts or
components, repair or replacement of worn or un-
serviceable elements (item) using original manu-
facturing tolerances and specifications, and sub-
sequent reassembly of the item.
(12) Symbols. The symbol O, F, or H placed in
the appropriate column indicates the level re-
sponsible for performing that particular mainte-
nance function. The symbol “%%” which applies to
organizational maintenance indicates the particu-
lar maintenance function may be performed pro-
vided it is specifically authorized by the direct sup-
port maintenance officer. Use of the symbol will
apply only to replacement of major assemblies and
time-consuming operations which are within the ca-
pabilities of organization, but over which control by
the commodity commands is considered essential. In
no case will the direct support maintenance 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.
d. Column 4, Tools and Equipment. This col-
umn will be used to specify, by code, those tools and
test equipment required to perform the designated
function.
e. Column 5, Remarks. Self-explanatory.
B-3. General.
a. A maintenance function assigned to a mainte-
nance level, which for any reason is beyond its capa-
bility, becomes the responsibility of the next higher
maintenance level.
b. The authority to perform a maintenance func-
tion does not constitute authority to requisition or
otherwise secure necessary repair parts as specified
in current supply directives.
B-4. Deviations.
a. Normally, there will be no deviations from the
assigned maintenance level. In cases of operational
B-1
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