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TM 11-5826-258-24
B-1. General
(inspect, test, service, adjust, align, calibrate, replace)
or other maintenance actions (welding, grinding, rivet-
This appendix provides a summary of the maintenance
ing, straightening, facing, remachining, or resurfac-
operations for AN/ARN-123(V). It authorizes cate-
ing) to restore serviceability to an item by correcting
gories of maintenance for specific maintenance func-
specific damage, fault, malfunction, or failure in a
tions on repairable items and components and the
part, subassembly, module (component or assembly),
tools and equipment required to perform each func-
end item, or system. This function does not include the
tion. This appendix may be used as an aid in planning
trial and error replacement of running spare type
maintenance operations.
items such as fuses, lamps, or electron tubes,
B-2. Maintenance Function
j. Overhaul. That maintenance effort (service/ac-
tion) necessary to restore an item to a completely serv-
Maintenance functions will be limited to and defined
iceable/operational condition as prescribed by mainte-
as follows:
nance standards (i.e., DMWR) in appropriate technical
a. Inspect. To determine the serviceability of an
publications. Overhaul is normally the highest degree
item by comparing its physical, mechanical, and/or
of maintenance performed by the Army. Overhaul
electrical characteristics with established standards
does not normally return an item to like new condi-
through examination.
b. Test. To verify serviceability and to detect in-
k. Rebuild. Consists of those services/actions neces-
cipient failure by measuring the mechanical or electri-
sary for the restoration of unserviceable equipment to
cal characteristics of an item and comparing those
a like new condition in accordance with original manu-
characteristics with prescribed standards.
facturing standards. Rebuild is the highest degree of
c. Service. Operations required periodically to keep
materiel maintenance applied to Army equipment.
an item in proper operating condition, i.e., to clean (de-
The rebuild operation includes the act of returning to
contaminate), to preserve, to drain, to paint, or to re-
zero those age measurements (hours, miles, etc.) con-
plenish fuel, lubricant, hydraulic fluids, or com-
sidered in classifying Army equipment/components.
pressed air supplies.
d. Adjust. To maintain, within prescribed limits, by
B-3. Column Entries
bringing into proper or exact position, or by setting
a. Column 1, Group Number. Column 1 lists group
the operating characteristics to the specified parame-
numbers, the purpose of which is to identify compo-
e. Align. To adjust specified variable elements of an
nents, assemblies, subassemblies, and modules with
item to bring about optimum or desired performance.
the next higher assembly.
f. Calibrate. To determine and cause corrections to
b. Column 2, Component/Assembly. Column 2 con-
be made or to be adjusted on instruments or teat meas-
tains the noun names of components, assemblies, sub
uring and diagnostic equipments used in precision
assemblies, and modules for which maintenance is au-
measurement. Consists of comparisons of two instru-
c. Column 3, Maintenance Functions. Column 3 lists
ments, one of which is a certified standard of known
accuracy, to detect and adjust any discrepancy in the
the functions to be performed on the item listed in col-
umn 2. When items are listed without maintenance
accuracy of the instrument being compared.
g. Install. The act of emplacing, seating, or fixing
functions, it is solely for purpose of having the group
into position an item, part, module (component or as-
numbers in the MAC and RPSTL coincide.
d. Column 4, Maintenance Category. Column 4
sembly) in a manner to allow the proper functioning of
the equipment or system.
specifies, by the listing of a "work time" figure in the
appropriate subcolumn(s), the lowest level of mainte-
h. Replace. The act of substituting a serviceable like
type part, subassembly, or module (component or as-
nance authorized to perform the function listed in col-
umn 3. This figure represents the active time required
sembly) for an unserviceable counterpart.
i. Repair. The application of maintenance services
to perform that maintenance function at the indicated

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