TM 9-4940-342-14&P
APPENDIX B
MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
B-1. General
The maintenance allocation chart (MAC) identifies
the components and assemblies of the oil fired
pressure
jet
steam
cleaner
which
require
maintenance. In addition, it assigns the lowest level
of maintenance capable of performing specific
maintenance functions.
B-2. Maintenance Functions
Those maintenance functions in column 3, section II
of this appendix are defined as follows:
a. Inspect. To determine the serviceability of an
item by comparing its physical, mechanical and/or
electrical characteristics with established standards
through examination.
b. Test. To verify serviceability and to detect
incipient failure by measuring the mechanical or
electrical characteristics of an item and comparing
those characteristics with prescribed standards.
c. Service. Operations required periodically to
keep an item in proper operating condition, ie, to
clean, preserve or paint.
d. Adjust. Maintain within prescribed limits by
bringing into proper or exact position, or by setting
the operating characteristics to the specified
parameters.
e. Align. To adjust specified variable elements of
an item to bring about optimum or desired
performance.
f. Calibrate. To determine the cause, corrections
to be made or to be adjusted on instruments or test
measuring and diagnostic equipment used in
precision measurement. Consists of comparisons of
two instruments, 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, module (component or
assembly) in a manner to allow the proper
functioning of the equipment/system.
h. Replace. The act of substituting a serviceable
like-type part, subassembly, module (component or
assembly) in a manner to allow the proper
functioning of the equipment/system.
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,
subassembly, module (component or assembly),
end item or system.
j. Overhaul.
That
maintenance
effort
(service/action) necessary to restore an item to a
completely serviceable/ operational condition as
prescribed
by
maintenance
standards
(eg,
DMWR) in pertinent technical publications.
Overhaul is normally the highest degree of
maintenance performed by the Army. Overhaul
does not normally return an item to like-new
condition.
k. Rebuild. Consists of those services /actions
necessary for the restoration of unserviceable
equipment to a like-new condition in accordance
with original manufacturing 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.
B-3. Explanation of Maintenance Allocation
Chart Format
a. Column 1, Group Number. Column 1 lists
the group numbers, the purpose of which is to
match components, assemblies, subassemblies
and modules with the next higher assembly.
b. Column 2, Functional Group. Column 2
lists the next higher assembly group and the item
names of components, assemblies, subassemblies
and modules within the group for which
maintenance is authorized.
C.
Column 3, Maintenance Function. Column
3 lists the eleven maintenance functions defined
in paragraph B-2. Each maintenance function
required for an item is specified by the symbol
among those listed in the following step d, which
indicates the level responsible for the required
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