APPENDIX B MAINTENANCE ALLOCATION CHART

TM 10-3030-633-12

APPENDIX B

MAINTENANCE ALLOCATION CHART

INTRODUCTION

Section I.

ancy in the accuracy of the instrument being

B-1.

General

compared.

a. This section provides a general explana-

g. Remove/Install. To remove and install the

tion of all maintenance and repair functions

same item when required to perform service or other

authorized at the various maintenance levels.

maintenance functions. Install may be the act of

b. The Maintenance Allocation Chart

emplacing, seating, or fixing into position a spare, re-

(MAC) in Section II designates overall authority and

pair part, or module (component or assembly) in a

responsibility for the performance of maintenance

manner to allow the proper functioning of an equip-

functions on the identified end item or component.

ment or system.

The application of the maintenance functions to the

h. Replace. To remove an unserviceable item

end item or component will be consistent with the ca-

and install a serviceable counterpart in its place. "Re-

p a c i t i e s and capabilities of the designated

place" is authorized by the MAC and is shown as the

maintenance levels.

third position of the SMR code.

c. Section III lists the tools and test equip-

i. Repair. The application of maintenance

ment (both special tools and common tool sets)

services, including fault location/troubleshooting, re-

required for each maintenance function as referenced

moval/installation,

and

disassembly/assembly

from Section II.

procedures, and maintenance actions to identify

d. Section IV contains supplemental instruc-

troubles and restore serviceability to an item by cor-

tions and explanatory notes for a particular

recting specific damage, fault, malfunction, or failure

maintenance function.

in a part, subassembly, module (component or assem-

bly), end item, or system.

B-2.

Maintenance Functions

j. Overhaul. That maintenance effort (serv-

Maintenance functions will be limited to and defined

ice/action) prescribed to restore an item to a

as follows:

completely serviceable/operational condition as re-

quired by maintenance standards in appropriate

a. Inspect. To determine the serviceability of

an item by comparing its physical, mechanical, and/or

technical publications (i. e., DMWR). Overhaul is nor-

mally the highest degree of maintenance performed by

electrical characteristics with established standards

through examination (e.g., by sight, sound, or feel).

the Army. Overhaul does not normally return an item

to like new condition.

b. Test. To verify serviceability by measuring

k. Rebuild. Consists of those services/actions

the mechanical, pneumatic, hydraulic, or electrical

necessary for the restoration of unserviceable equip-

characteristics of an item and comparing those char-

ment to a like new condition in accordance with

acteristics with prescribed standards.

original manufacturing standards. Rebuild is the high-

c. Service. Operations required periodically

est degree of materiel maintenance applied to Army

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

equipment. The rebuild operation includes the act of

clean (includes decontaminate, when required), to

returning to zero those age measurements (hours/

preserve, to drain, to paint, or to replenish fuel, lubri-

miles, etc.) considered in classifying Army

cants, chemical fluids, or gases.

equipment/components.

d. Adjust. To maintain or regulate, within

B-3.

Explanation of Columns in the MAC, Sec-

prescribed limits, by bringing into proper or exact po-

sition, or by setting the operating characteristics to

tion II

specified parameters.

a. Column 1, Group Number. Column 1 lists

e. Aline. To adjust specified variable ele-

functional group code numbers, the purpose of which

ments of an item to bring about optimum or desired

is to identify maintenance significant components, as-

performance.

semblies, subassemblies, and modules with the next

higher assembly. End item group number shall be

j. Calibrate. To determine and cause cor-

"00."

rections to be made or to be adjusted on instruments

b. Column 2, Component/Assembly. Column

or test, measuring, and diagnostic equipments used in

2 contains the names of components, assemblies, sub-

precision measurement. Consists of comparisons of

assemblies, and modules for which maintenance is

two instruments, one of which is a certified standard

authorized.

of known accuracy, to detect and adjust any discrep-

B-1

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