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Section IV. NATIONAL STOCK NUMBER AND PART NUMBER INDEX - TM-9-4931-363-14-P0173
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TM-9-4931-363-14-P Fire Control Subsystem Test Set AN/GSM-249 P/N 2201736-05 Manual
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Explanation of Format.
TM 9-4931-363-14&P
MAINTENANCE ALLOCATION CHART (MAC)
Section I. INTRODUCTION
h. Replace. The act of substituting a serviceable like
C-1. General.
t y p e part, subassembly,  o r m o d u l e ( c o m p o n e n t o r
assembly) in a manner to allow the proper functioning of
This Maintenance Allocation Chart designates overall
an equipment/system.
responsibility for the performance of maintenance
functions for the fire control subsystem test set. The
i. Repair. The application of maintenance services
implementation of field maintenance tasks upon this test
(input, test, service, adjust, align, calibrate, replace) or
s e t will be consistent with the assigned maintenance
other maintenance actions (welding, grinding, riveting,
operations.
straightening, facing, remachining, or resurfacing) to restore
serviceability to an item by correcting specific damage,
C-2. Maintenance FunctionsC
fault, malfunction, or failure in a part, disassembly,
module/component/assembly end item or system.
Maintenance functions will be limited to and defined as
follows:
j. Overhaul. That maintenance effort (service/action)
necessary to restore an item to a completely
a. Inspect. To determine the serviceability of an item
serviceable/operational condition as prescribed by
by comparing its physical, mechanical and/or electrical
maintenance standards (e.g., DMWR) in pertinent technical
publications. Overhaul is normally the highest degree of
characteristics with established standards through
examination.
maintenance performed by the Army. Overhaul does not
normally return an item to like new condition.
b. Test. To verify serviceability and detect incipient
failure by measuring  the mechanical or electrical
k. Rebuild. Consists of those services/actions necessary
characteristics of an item and comparing those
for the restoration of unserviceable equipment to a like new
characteristics with prescribed standards.
c o n d i t i o n in accordance with original manufacturing
s t a n d a r d s . Rebuild is the highest degree of material
c. Service. Operations required periodically to keep an
maintenance applied to Army equipment. The rebuild
end item in proper operating condition, i.e., to clean, to
operation includes the act of returning to zero those age
preserve, to drain, to paint, or to replenish fuel, lubricants,
measurements (hours/miles, etc.) considered in classifying
hydraulic fluids, or compressed air supplies.
Army  equipments/components.
d. Adjust. To maintain, within prescribed limits, by
l. Symbols. The uppercase letter placed in the
bringing into proper or exact position, or by setting the
appropriate column indicates the lowest level at which that
operating characteristics to specified parameters.
particular maintenance function is to be performed.
e. Align. To adjust specified variable elements of an
item to bring about optimum or desired performance.
C-3. Explanation of Format.
f. Calibrate. To determine and cause corrections to be
Purpose and use of the format are as follows.
made or to be adjusted on instruments or test measuring
and diagnostic equipments used in precision measurement.
a. Column 1. Group Number. Column 1, lists group
Consists of comparisons of two instruments, one of which
numbers, the purpose of which is to identify components,
is a certified standard of known accuracy, to detect and
assemblies, subassemblies, and modules with the next
adjust any discrepancy in the accuracy of the instrument
higher assembly.
being compared.
g. Install. The act of emplacing, seating, or fixing into
b. Column 2. Functional Group. Column 2, lists the
n e x t higher assembly group and the item names of
position an item, part, or module (component or assembly)
i n a manner to allow the proper functioning of an
components, assemblies, subassemblies, and modules within
the group for which maintenance is authorized.
equipment or system.

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