ARMY TM 5-6675-308-12
MARINE CORPS TM 08837A-12/1A
MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
f. Calibrate. To determine and cause corrections to
D-1. General.
be made or to be adjusted on instruments or test
a. This appendix lists the maintenance operations
measuring and diagnostic equipments used in precision
for the Position and Azimuth Determining System
measurement. Consists of comparisons of two instru-
(PADS), AN/USQ-70, LIN P21220, SSN M757, NSN
ments, one of which is a certified standard of known
6675-01-071-5552. It authorizes categories of mainte-
accuracy, to detect and adjust any discrepancy in the
nance functions for specific maintenance functions on
accuracy of the instrument being compared.
repairable items and components, and the tools and
equipment required to perform each function. This
g. Install. The act of replacing, seating, or fixing
appendix may be used as an aid in planning mainte-
into position an item, part, or module (component or
nance operations.
assembly) in a manner to allow the proper functioning
of an equipment or system.
b. The Maintenance Allocation Chart (MAC) in
Section II designates the overall responsibility for the
h. Replace. The act of substituting a serviceable
performance of maintenance functions on each item or
like type part, subassembly or module (component or
component. Implementation of the maintenance forma-
subassembly) for an unserviceable counterpart.
tions will be consistent with the assigned maintenance
i. Repair. The application of maintenance services
functions.
(inspect, test, service, adjust, align, calibrate, replace) or
c. Section III lists the special tools and test equip-
other maintenance actions (welding, grinding, riveting,
ment required for each maintenance function as refer-
straightening, facing, remachining, or resurfacing) to
enced in Section II.
restore serviceability to an item by correcting specific
damage, fault, malfunction, or failure in a part, subas-
d. Section IV contains supplemental instructions
sembly, module (component or assembly), end item, or
and explanatory notes for particular maintenance func-
system.
tions.
j. Overhaul. That maintenance effort (service/ac-
tion) necessary to restore an item to a completely
D-2. Maintenance Functions. Maintenance functions
serviceable/operational condition as prescribed by
will be limited to and defined as follows:
maintenance standards, i.e., DMWR, in appropriate
technical publications. Overhaul is normally the highest
a. Inspect. To determine the serviceability of an
degree of maintenance performed by the Army. Over-
item by comparing its physical, mechanical, and/or
haul does not normally return an item to like new
electrical characteristics with established standards
condition.
through examination.
b. Test. To verify serviceability and detect incipient
k. Rebuild. Consists of those services/actions nec-
failure by measuring the mechanical or electrical char-
essary for the restoration of unserviceable equipment to
acteristics of an item and comparing those characteris-
a like new condition in accordance with original manu-
tics with prescribed standards.
facturing standards. Rebuild is the highest degree of
material maintenance applied to Army equipment. The
c. Service. Operations required periodically to keep
rebuild operation includes the act of returning to zero
an item in proper operating condition, i.e., to clean
those age measurements (hours/ miles etc.) considered in
(decontaminate); to preserve; to drain; to paint; or to
classifying Army equipments/components.
replenish fuel, lubricants, hydraulic fluids, or com-
pressed air supplies.
D-3. Maintenance Allocation Chart Column Entries,
d. Adjust. To maintain, within prescribed limits, by
Section II.
bringing into proper or exact position, or by setting the
operating characteristics to specified parameters.
a. Column 1: Group Number. Column 1 lists the
. roup numbers which identify components, assemblies.
g
e. Align. To adjust specified variable elements of
subassemblies, and modules with the next higher assem-
an item to bring about optimum or desired perform-
bly.
ance.
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