TM 5-4520-240-14
APPENDIX B
MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
B-1. General.
(6) Calibrate. To determine and cause corrections
a. This section provides a general explanation of all
to be made or to be adjusted on instruments or test
maintenance and repair functions authorized at
measuring and diagnostic equipments used in precision
various maintenance levels.
measurement. Consists of comparison of two instru-
ments, one of which is a certified standard of known ac-
b. Section II designates overall responsibility for the
performance of maintenance functions on the iden-
curacy, to detect and adjust any discrepancy in the ac-
tified end item or component and the work measure-
curacy of the instrument being compared.
(7) Install. The act of emplacing, seating, or fixing
ment time required to perform the functions by the
into position an item, part, or module (component or as-
designated maintenance level. The implementation of
the maintenance functions upon the end item or com-
sembly) in a manner to allow the proper functioning of
an equipment or system.
ponent will be consistent with the assigned mainte-
nance functions.
(8) Replace. The act of substituting a serviceable
like type part, subassembly, or module (component or
c. Section III lists the tools and test equipment re-
assembly) for an unserviceable counterpart.
quired for each maintenance function as referenced
from Section II.
(9) Repair. The application of maintenance ser-
vices (inspect, test, service, adjust, align, calibrate, or
B-2. Explanation of Columns in Section Il.
replace) or other maintenance actions (welding, grind-
a. Column (1), Group Number. Column (1) lists
ing, riveting, straightening, facing, remachining, or
group numbers to identify related components, assem-
resurfacing) to restore serviceability to an item by cor-
blies, sub-assemblies, and modules with their next
recting specific damage, fault, malfunction, or failure
higher assembly. The applicable groups are listed in
in a part, subassembly, module (component or assem-
the MAC in disassembly sequence beginning with the
bly), end item, or system.
first group removed.
(10) Overhaul. That maintenance effort (ser-
b. Column (2), Component/Assembly. This column
vice/action) necessary to restore an item to a com-
contains the noun names of components, assemblies,
pletely serviceable/operational condition as prescribed
subassemblies and modules for which maintenance is
by maintenance standards (i.e., DMWR) in appropriate
authorized.
technical publications. Overhaul is normally the high-
c. Column (3), Maintenance Functions. This column
est degree of maintenance performed by the Army.
lists the functions to be performed on the item listed in
Overhaul does not normally return an item to a like-
Column 2. The maintenance functions are defined as
new condition.
follows:
(11) Rebuild. Consists of those services/actions
(1) Inspect. To determine serviceability of an item
necessary for the restoration of unserviceable equip.
by comparing its physical, mechanical, and/or electri-
ment to a like-new condition in accordance with origi-
cal characteristics with established standards through
nal manufacturing standards. Rebuild is the highest
examination.
degree of materiel maintenance applied to Army equip-
(2) Test. To verify serviceability and detect inci-
ment. The rebuild operation includes the act of return-
pient failure by measuring the mechanical or electrical
ing to zero those age measurements (hours/miles, etc.)
characteristics of an item and comparing those charac-
considered in classifying Army equip-
teristics with prescribed standards.
ment/components.
(3) Service. Operations required periodically to
keep an item in proper operating condition, i.e., to
d. Column (4), Maintenance Category. This column
clean (decontaminated), to preserve, to drain, to paint,
is made up of sub-columns for each category of mainte-
or to replenish fuel, lubricants, hydraulic fluids, or
nance. Work time figures are listed in these sub-col-
compressed air supplies.
umns for the lowest level of maintenance authorized to
(4) Adjust. To maintain within prescribed limits,
perform the function listed in Column 3. These figures
by bringing into proper or exact position, or by setting
indicate the average active time required to perform
t h e operating characteristics to be specified
the maintenance function at the indicated category of
parameters.
maintenance under typical field operating conditions.
e. Column (6), Tools and Equipment This column is
(5) Align. To adjust specified variable elements of
an item to bring about optimum or desired perfor-
provided for referencing by code, the common tool sets
mance.
(not individual tools) special tools, test and support
B-1
