ARMY TM 5-6675-238-14
MARINE CORPS TM 08839A-14/1
MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
a. This appendix lists the maintenance operations
for the PADS Test Set, AN/USM-427, LIN T83225,
NSN 6675-01-081-9198. It authorizes categories of
maintenance functions for specific maintenance func-
tions on repairable items and components, and the tools
and equipment required to perform each function. This
appendix may be used as an aid in planning mainte-
b. The Maintenance Allocation Chart (MAC) in
Section II designates the overall responsibility for the
performance of maintenance functions on each item or
component. Implementation of the maintenance forma-
tions will be consistent with the assigned maintenance
c. Section III lists the special tools and test equip-
ment required for each maintenance function as refer-
enced in Section II.
d. Section IV contains supplemental instructions
and explanatory notes for particular maintenance func-
D-2. Maintenance Functions. Maintenance functions
will be limited to and defined as follows:
a. Inspect. To determine the serviceability of an
item by comparing its physical, mechanical, and/or
electrical characteristics with established standards
b. Test. To verify serviceability and detect incipient
failure by measuring the mechanical or electrical char-
acteristics of an item and comparing those characteris-
tics with prescribed standards.
c. Service. Operations required periodically to keep
an item in proper operating condition, i.e., to clean
(decontaminate); to preserve; to drain; to paint; or to
replenish fuel, lubricants, hydraulic fluids, or com-
pressed air supplies.
d. Adjust. To maintain within prescribed limits, by
bringing into proper or exact position, or by setting the
operating characteristics to specified parameters.
e. Align. To adjust specified variable elements of an
item to bring about optimum or desired performance.
f. Calibrate. To determine and cause corrections to
be made or to be adjusted on instruments or test
measuring and diagnostic equipments used in precision
measurement, Consists of comparisons of two instru-
ments, one of which is a certified standard of known
accuracy, to detect and adjust any discrepancy in the
accuracy of the instrument being compared.
g. Install. The act of emplacing, seating, or fixing
into position an item, part, or module (component or
assembly) in a manner to allow the proper functioning
of an equipment or system.
h. Replace. The act of substituting a serviceable
like type part, subassembly, or module (component or
assembly) for an unserviceable counterpart.
i. Repair. The application of maintenance services
(inspect, test, service, adjust, align, calibrate, replace) or
other maintenance actions (welding, grinding, riveting,
straightening, facing, remachining, or resurfacing), to
restore serviceability to an item by correcting specific
damage, fault, malfunction, or failure in a part, subas-
sembly, module (component or assembly), end item, or
j. Overhaul. That maintenance effort (service/ac-
tion) necessary to restore an item to a completely
serviceable/operational condition as prescribed by
maintenance standards, i.e., DMWR, in appropriate
technical publications. Overhaul is normally the highest
degree of maintenance performed by the Army, Over-
haul does not normally return an item to like new
k. Rebuild. Consists of those services/actions neces-
sary for the restoration of unserviceable equipment to a
like new condition in accordance with original manu-
facturing standards. Rebuild is the highest degree of
material maintenance applied to Army equipment. The
rebuild operation includes the act of returning to zero
those age measurements (hours/miles etc.) considered in
classifying Army equipment/components.
D-3. Maintenance Allocation Chart Column Entries,
a. Columm 1: Group Number. Column 1 lists the
group numbers which identify components, assemblies,
subassemblies, and modules with the next higher assem-
b. Column 2: Component/Assembly. Column 2 lists
the noun names of components, assemblies, subassem-
blies, and modules for which maintenance is authorized.