APPENDIX B MAINTENANCE ALLOCATION CHART

TM 10-3930-631-12

APPENDIX B

MAINTENANCE ALLOCATION CHART

Section I. INTRODUCTION

measuring, and diagnostic equipments used in precision

B-1. General

measurement.

Consists of comparisons of two

a. This section provides a general explanation of

instruments, one of which is a certified standard of

all maintenance and repair functions authorized at the

known accuracy, to detect and adjust any discrepancy in

various maintenance levels.

the accuracy of the instrument being compared.

b. The Maintenance Allocation Chart (MAC) in

g. Removal lnstall. To remove and install the

Section II designates overall authority and responsibility

same item when required to perform service or other

for the performance of maintenance functions on the

maintenance functions.

Install may be the act of

identified end item or component. The application of the

emplacing, seating, or fixing into position a spare, repair

maintenance functions to the end item or component will

part, or module (component or assembly) in a manner to

be consistent with the capacities and capabilities of the

allow the proper functioning of an equipment or system.

designated maintenance levels.

h. Replace. To remove an unserviceable item

c. Section III lists the tools and test equipment

and install a serviceable counterpart in its place.

(both special tools and common tool sets) required for

Replace is authorized by the MAC and is shown as the

each maintenance function as referenced from Section

third position of the SMR code.

II.

Repair.

The application of maintenance

d. Section IV contains supplemental instructions

services,

including

fault

location/troubleshooting,

and explanatory notes for a particular maintenance

removal/installation,

and

disassembly/assembly

function.

procedures, and maintenance actions to identify troubles

B-2. Maintenance Functions

and restore serviceability to an item by correcting specific

Maintenance functions will be limited to and defined as

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

follows:

subassembly, module (component or assembly), end

a. Inspect. To determine the serviceability of an

item, or system.

item by comparing its physical, mechanical, and/or

Overhaul.

That maintenance effort

electrical characteristics with established standards

(service/action) prescribed to restore an item to a

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

completely serviceable/operational condition as required

b. Test. To verify serviceability by measuring the

by maintenance standards in appropriate technical

mechanical, pneumatic, hydraulic, or electrical

publications (i. e., DMWR). Overhaul is normally the

characteristics of an item and comparing those

highest degree of maintenance performed by the Army.

characteristics with prescribed standards.

Overhaul does not normally return an item to like new

c. Service. Operations required periodically to

condition.

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

k. Rebuild. Consists of those services/actions

(includes decontaminate, when required), to preserve, to

necessary for the restoration of unserviceable equipment

drain, to paint, or to replenish fuel, lubricants, chemical

to a like new condition in accordance with original

fluids, or gases.

manufacturing standards. Rebuild is the highest degree

Adjust.

To maintain or regulate, within

of materiel maintenance applied to Army equipment.

prescribed limits, by bringing into proper or exact

The rebuild operation includes the act of returning to zero

position, or by setting the operating characteristics to

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

specified parameters.

in classifying Army equipment/components.

e. Aline. 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,

Change 2 B-1