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APPENDIX A REFERENCES - TM-9-1220-223-140027
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TM-9-1220-223-14 Fire Plotting Board M17 W/E [1220-588-7282] Manual
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MAINTENANCE ALLOCATION CHART
APPENDIX B
MAINTENANCE ALLOCATION CHART
INTRODUCTION
Section I.
h. Replace. To replace unserviceable items with
B-1. General
serviceable assemblies, subassemblies, or parts.
This Maintenance Allocation Chart designates
i. Repair. Those maintenance operations neces-
overall responsibility for the performance of
sary to restore an item to serviceable condition
maintenance functions on the identified end item
through correction of material damage or a spe-
or component. The implementation of field main-
cific failure. Repair may be accomplished at each
tenance tasks upon this end item or component
category of maintenance.
will be consistent with the assigned maintenance
operations.
j. Overhaul. Normally, the highest degree of
maintenance performed by the Army in order to
B-2. Maintenance Functions
minimize time work in process is consistent with
Maintenance functions will be limited to and
quality and economy of operation. It consists of
that maintenance necessary to restore an item to
defined as follows:
completely serviceable condition as prescribed by
a. Inspect. To determine serviceability of an
maintenance standards in technical publications
item by comparing its physical, mechanical and
for each item of equipment. Overhaul normally
electrical characteristics with established stand-
does not return an item to like new, zero mileage,
ards.
or zero hour condition.
b. Test. To verify serviceability and to detect
k. Rebuild. The highest degree of materiel
electrical or mechanical failure by use of test
maintenance. It consists of restoring equipment
equipment.
as nearly as possible to new condition in accord-
c. Service. To clean, to preserve, to charge and
ance with original manufacturing standards. Re-
to add fuel, lubricants, cooling agents, and air.
build is performed only when required by oper-
If it is desired that elements, such as painting
ational considerations or other paramount factors
and lubricating, be defined separately, they may
and then only at the depot maintenance cate-
be so listed.
gory. Rebuild reduces to zero the hours or miles
the equipment, or component thereof, has been
d. Adjust. To rectify to the extent necessary
in use.
to bring into proper operating range.
l. Symbols. The uppercase letter placed in the
e. Align. To adjust specified variable elements
appropriate column indicates the lowest level at
of an item to bring to optimum performance.
which that particular maintenance function is
f. Calibrate. To determine the corrections to
to be performed.
be made in the readings of instruments or test
equipment used in precise measurement. Con-
B-3. Explanation of Columns
sists of the comparison of two instruments, one
Listed below is an explanation of the columns
of which is a certified standard of known ac-
shown in the maintenance allocation chart:
curacy, to detect and adjust any discrepancy in
the accuracy of the instrument being compared
a. Column 1, Group Number. Column 1 lists
with the certified standard.
group numbers, the purpose of which is to iden-
tify components, assemblies, subassemblies and
g. Install. To set up for use in an operational
modules with the next higher assembly.
environment such as an emplacement, site, or
b. Column 2, Functional Group. Column 2
vehicle.
B-1

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