Appendix D. MAINTENANCE ALLOCATION CHART

ARMY TM 5-6675-309-14

MARINE CORPS TM 08840A-14/1

APPENDIX D

MAINTENANCE ALLOCATION CHART

Section 1. INTRODUCTION

D-1. General.

measurement. Consists of comparisons of two instru-

ments, one of which is a certified standard of known

a. This appendix lists the maintenance operations

accuracy, to detect and adjust any discrepancy in the

for the Power Supply Test Set, AN/USM-428, LIN

accuracy of the instrument being compared.

T24899, SSN M767, NSN 6675-02-0075-4033. It autho-

rizes categories of maintenance functions for specific

g. Install. The act of emplacing, seating, or fixing

maintenance functions on repairable items and compo-

into position item, part, or module (component or

nents, and the tools and equipment required to perform

assembly) in a manner to allow the proper functioning

each function. This appendix may be used as an aid in

of an equipment or system.

planning maintenance operations.

h. Replace. The act of substituting a serviceable

b. The Maintenance Allocation Chart (MAC) in

like type part, subassembly, or module (component or

Section II designates the overall responsibility for the

assembly) for an unserviceable counterpart.

performance of maintenance functions on each item or

i. Repair. The application of maintenance services

component. Implementation of the maintenance forma-

(inspect, test, service, adjust, align, calibrate, replace) or

tions will be consistent with the assigned maintenance

other maintenance actions (welding, grinding, riveting,

functions.

straightening, facing, remachining, or resurfacing), to

c. Section III lists the special tools and test equip-

restore serviceability to an item by correcting specific

ment required for each maintenance function as refer-

damage, fault, malfunction, or failure in a part, subas-

enced in Section II.

sembly, module (component or assembly), end item, or

system.

d. Section IV contains supplemental instructions

and explanatory notes for particular maintenance func-

j. Overhaul. That maintenance effort (service/ac-

tions.

tion) necessary to restore an item to a completely

serviceable/operational condition as prescribed by

D-2. Maintenance Functions. Maintenance functions

maintenance standards, i.e., DMWR, in appropriate

will be limited to and defined as follows:

technical publications. Overhaul is normally the highest

degree of maintenance performed by the Army. Over-

a. Inspect. To determine the serviceability of an

haul does not normally return an item to like new

item by comparing its physical, mechanical, and/or

condition.

electrical characteristics with established standards

through examination.

k. Rebuild. Consists of those services/actions neces-

sary for the restoration of unserviceable equipment to a

b. Test. To verify serviceability and detect incipient

like new condition in accordance with original manu-

failure by measuring the mechanical or electrical char-

facturing standards. Rebuild is the highest degree of

acteristics of an item and comparing those characteris-

material maintenance applied to Army equipment. The

tics with prescribed standards.

rebuild operation includes the act of returning to zero

c. Service. Operations required periodically to keep

those age measurements (hours/miles etc.) considered in

an item in proper operating condition, i.e., to clean

classifying Army equipment/components.

(decontaminate); to preserve; to drain; to paint; or to

replenish fuel, lubricants, hydraulic fluids, or com-

pressed air supplies.

D-3. Maintenance Allocation Chart Column Entries,

Section II.

d. Adjust. To maintain, within prescribed limits, by

bringing into proper or exact position, or by setting the

a. Column 1: Group Number. Column 1 lists the

operating characteristics to specified parameters.

group numbers which identify components, assemblies,

subassemblies, and modules with the next higher assem-

e. Align. To adjust specified variable elements of an

bly.

item to ring about optimum or desired performance.

f. Calibrate. To determine and cause corrections to

b. Column 2: Component/Assembly. Column 2 lists

be made or to be adjusted on instruments or test

the noun names of components, assemblies, subassem-

measuring and diagnostic equipments used in precision

blies, and modules for which maintenance is authorized.

D-1