Appendix B. MAINTENANCE ALLOCATION CHART

TM 5-4120-355-14

APPENDIX B

MAINTENANCE ALLOCATION CHART

Section 1. Introduction

B-1. General.

a. This section provides a general explanation of all maintenance and repair functions authorized at various main-

tenance levels.

b. The Maintenance Allocation Chart (MAC) in Section II designates overall responsibility for the performance of

maintenance functions on the identified end item or component. The implementation of the maintenance functions upon

the end item or component will be consistent with the assigned maintenance functions.

c. Section I I I lists the special tools and test equipment required for each maintenance function as referenced from

Section II.

d. Section IV contains supplemental instructions on explanatory notes for a particular maintenance function.

B-2. Maintenance Functions.

a. Inspect. To determine the serviceability of an item by comparing its physical, mechanical and/or electrical charac-

teristics with established standards through examination.

b. Test. To verify serviceability and 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 (decon-

taminate), 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 operat-

ing characteristics to specified parameters.

e. Align. To adjust specified variable elements of an item to bring about optimum or desired results.

f. Calibrate. To determine and cause corrections to be made or to be adjusted on instruments or test measuring and

diagnostic equipments used in precision measurement. Consists of comparisons of two instruments, one of which is a cer-

tified standard of known accuracy, to detect and adjust any discrepancy in the accuracy of the instrument being com-

pared.

g. Install. The act of emplacing, seating, or fixing into position an item, part, or module (component or assembly)

in a manner to allow the proper functioning of an equipment or 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, or 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), and item or system.

j. Overhaul. That maintenance effort (services/actions) necessary to restore an item to a completely serviceable/op-

erational condition as prescribed by maintenance standards (i.e., DMWR ) in appropriate technical publications. Over-

haul is normally the highest degree of maintenance performed by the Army. Overhaul does not normally return an item

to like new condition.

B-1