TM 5-4930-218-14
MAINTENANCE ALLOCATION CHART
S e c t i o n I. INTRODUCTION
B-1. General
act of returning to zero those age measurements
(hours, miles, etc.) considered in classifying Army
a. This section provides a general explanation of
equipment/components.
all maintenance and repair functions authorized at
various maintenance levels.
h. Repair. The application of maintenance services
(inspect, test, service, adjust, align, calibrate,
b. Section II designates overall responsibility for
replace) or other maintenance actions (welding,
the performance of maintenance functions on the
grinding, riveting, straightening, facing, remachin-
identified end item or component. The im-
ing, or resurfacing) to restore serviceability to an
plementation of the maintenance functions upon the
item by correcting specific damage, fault, malfunc-
identified end item or component will be consistent
tion, or failure in a part, subassembly, module/com-
with the assigned maintenance functions.
ponent/assembly, end item, or system.
i. Replace. The act of substituting a serviceable
B-2. Maintenance Functions
like-type part, subassembly, module (component or
Maintenance functions are defined as follows:
assembly) in a manner to allow the proper func-
a. Adjust. Maintain within prescribed limits by
tioning of an equipment/system.
bringing into proper or exact position, or by setting
j. Service. Operations required periodically to keep
the operating characteristics to the specified
an item in proper operating condition, i.e., to clean,
parameters.
p r e s e r v e , drain, p a i n t , o r t o r e p l e n i s h
b. Align. To adjust specified variable elements of
fuel/lubricants/hydraulic fluids or compressed air
an item to bring about optimum or desired per-
supplies.
formance.
k. Test. To verify serviceability and to detect in-
c. Calibrate. To determine and cause corrections to
cipient failure by measuring the mechanical or elec-
be made or to be adjusted on instruments or test
trical characteristics of an item and comparing those
measuring and diagnostic equipment used in
characteristics with prescribed standards.
precision measurement. Consists of comparisons of
l. Symbols. The uppercase letter placed in the ap-
two instruments, one of which is a certified standard
propriate column indicates the lowest level at which
of known accuracy, to detect and adjust any
that particular maintenance function is to be per-
discrepancy in the accuracy of the instrument being
formed.
compared.
d. Inspect. To determine the serviceability of an
B-3. Explanation of Format
item by comparing its physical, mechanical, and/or
Purpose and use of the format are as follows, and
electrical characteristics with established standards
shall be explained in the introductory portion of the
through examination.
MAC.
e. Install. The act of emplacing, seating, or fixing
a. Column (1), Group number. Column 1 lists
into position an item, part, module (component or
group numbers, the purpose of which is to match
assembly) in a manner to allow the proper func-
components, assemblies, subassemblies and modules
tioning of the equipment/system.
with the next higher assembly.
f. Overhaul. That maintenance effort (ser-
vice/action) necessary to restore an item to a com-
b. Column (2), Functional group. Column 2 lists
the next higher assembly group and the item names
pletely serviceable/operational condition as
of components, assemblies, subassemblies and
prescribed by maintenance standards (e.g., DMWR)
modules within the group for which maintenance is
in pertinent technical publications. Overhaul is nor-
authorized.
mally the highest degree of maintenance performed
by the Army. Overhaul does not normally return an
c. Column (3), Maintenance function. Column 3
item to like-new condition.
lists the twelve maintenance functions defined in B-2
g. Rebuild. Consists of those services/actions
above, Each maintenance function required for an
necessary for the restoration of unserviceable equip-
item shall be specified by the symbol among those
ment to a like-new condition in accordance with
listed in d below which indicates the level responsible
original manufacturing standards. Rebuild is the
for the required maintenance, Under this symbol
highest degree of materiel maintenance applied to
there shall be listed an appropriate work
Army equipment. The rebuild operation includes the
measurement time value determined as indicated in e
