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TM 10-3930-634-12
MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
B-l. General
characteristics with prescribed standards.
a. This section provides a general explanation of all
C. Service. Operations required periodically to
maintenance and repair functions authorized at
keep an item in proper operating condition, i.e., to
various maintenance levels.
clean, to preserve, to drain, to paint, or to replenish
b. Section II designates overall responsibility for the
fuel, lubricants, hydraulic fluids, or compressed air
performance of maintenance functions on the iden-
supplies.
tified end item or component and the work measure-
D. Adjust. To maintain within prescribed limits,
ment time required to perform the functions by the
by bringing into proper or exact position, or by setting
desiginated maintenance level. The implementation of
the operating characteristics to specified parameters.
the maintenance functions upon the end item or com-
E. Aline. To adjust specified parts of an item to
ponent will be consistent with the assigned mainte-
bring about optimum or desired performance.
nance functions.
F. Calibrate. To determine and cause corrections
c. Section III lists the special tools and test equip-
to be made or to be adjusted on instruments or test
ment required for each maintenance function as refer-
measuring and diagnostic equipments used in precision
enced from Section II.
measurement. Consists of comparisons of two instru-
d. Section IV contains supplemental instructions or
ments, one of which is a certified standard of known
explanatory notes for a particular maintenance func-
accuracy, to detect and adjust any discrepancy in the
tion.
accuracy of the instrument being compared.
G. Install. The act of emplacing, seating, or fixing
B-2. Explanation of Columns in Section II
into position an item, part, or module (component or as-
a. Column (1), Group Number. A number is
sembly) in a manner to allow the proper functioning of
assigned to each group in a top down breakdown se-
an equipment or system.
quence. The applicable groups are listed in the MAC in
H. Replace. The act of substituting a serviceable
disassembly sequence beginning with the first group
like type part, subassembly, or module (component or
removed.
assembly) for an unserviceable counterpart.
b. Column (2), Functional Group. This column con-
I. Repair. The application of maintenance services
tains a brief description of the components of each
(inspect, test, service, adjust, align, calibrate, or
numerical group.
replace) or other maintenance actions (welding, grind-
c. Column (3), Maintenance Functions. This column
ing, riveting, straightening, facing, remachining or
lists the various maintenance functions (A through K).
resurfacing) to restore serviceability to an item by cor-
The lowest maintenance level authorized to perform
recting specific damage, fault, malfunction, or failure
these functions is indicated by a symbol in the ap-
in a part, subassembly, module (component or assem-
propriate column. Work measurement time standards
bly), end item, or system.
(the active repair time required to perform the mainte-
J. Overhaul. The maintenance effort (ser-
nance function) are shown directly below the symbol
vice/action) necessary to restore an item to a com-
identifying the maintenance level: The symbol desig-
pletely serviceable/operational condition as prescribed
nations for the various maintenance levels are as
by maintenance standards (i.e., DMWR) in appropriate
follows:
technical publication. Overhaul is normally the highest
C-Operator or Crew
degree of maintenance performed by the Army. Over-
O-Organizational maintenance
haul does not normally return an item to like new con-
F-Direct support maintenance
dition.
H-General support maintenance
K. Rebuild. Consists of those services/actions
D-Depot maintenance
The maintenance functions are defined as follows:
necessary for the restoration of unserviceable equip-
ment to a like new condition in accordance with origi-
A. Inspect. To determine serviceability of an item
nal manufacturing standards. Rebuild is the highest
by comparing its physical, mechanical, and electrical
characteristics with established standards through ex-
degree of materiel maintenance applied to Army
equipment. The rebuild operation includes the act of
amination.
returning to zero those age measurement (hours/miles,
B. Test. To verify serviceability and detect early
signs of failure by measuring the mechanical or electri-
etc.) considered in classifying Army equip-
ment/components.
cal characteristics of an item and comparing those
B-1

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