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TM 11-6140-224-13&P
APPENDIX B
MAINTENANCE ALLOCATION
Section I. INTRODUCTION
B-1.
General
This appendix provides a summary of the maintenance operations for BB-542/U. It authorizes categories of maintenance
for specific maintenance functions 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 maintenance operations.
B.2. Maintenance Function
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 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, i.e., to clean
(decontaminate), to preserve, to drain, to paint, or to replenish fuel, lubricants, hydraulic fluids, or compressed air supplies.
d. Adjust. To 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 and 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 of 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, subassembly. module (component or
assembly), end item, or system.
j.  Overhaul. That maintenance effort (service/action) necessary to restore an item to a completely ser-
viceable/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. 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 materiel maintenance
applied to Army equipment. The rebuild operation includes the act of turning to zero those age measurements (hours,
miles, etc.) considered in classifying Army equipments/components.
B-3. Column Entries
a. Column 1, Group Number. Column 1 lists group numbers, the purpose of which is to identify components,
assemblies, and modules with the next higher assembly.
B-1

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