APPENDIX B MAINTENANCE ALLOCATION CHART

TM10-3930-628-12

APPENDIX B

MAINTENANCE ALLOCATION CHART

Section I. INTRODUCTION

elements, such as painting and lubricating, be defined

B-1.

General

separately, they may be so listed.

a. This section provides a general explanation of all

D - Adjust. To rectify to the extent necessary to

maintenance and repair functions authorized at various

bring into proper operating range.

maintenance levels.

E - Align. To adjust specified variable elements

b. Section II designates overall responsibility for the

of an item to bring to optimum performance.

performance of maintenance functions on the identified

F - Calibrate. To determine the corrections to be

end item or component. The implementation of the

made in the readings of instruments or test equipment

maintenance functions upon the end item or component

used in precise measurement.

Consists of the

will be consistent with the assigned maintenance

comparison of two instruments, one of which is a

functions.

certified standard of known accuracy, to test and adjust

c. Section III-not applicable

any discrepancy in the accuracy of the instrument being

d. Section IV contains supplemental instructions,

compared with the certified standard.

explanatory notes and / or illustrations required for a

G - Install. To set up for use in an operational

particular maintenance function.

environment such as an emplacement, site, or vehicle.

H - Replace. To replace unserviceable items

B-2.

Explanation of Columns in Section II

with serviceable like items.

a. Group Number, Column (1). The assembly group

I - Repair.

Those maintenance operations

is a, numerical group assigned to each assembly in a top

necessary to restore an item to serviceable condition

down breakdown sequence. The applicable assembly

through correction of material damage or a specific

groups are listed on the MAC in disassembly sequence

failure. Repair may be accomplished at each category of

beginning with the first assembly removed in a top down

maintenance.

disassembly sequence.

J - Overhaul. Normally, the highest degree of

b. Assembly Group, Column (2). This column

maintenance performed by the Army in order to minimize

contains a brief description of the components of each

time work in process is consistent with quality and

assembly group.

economy of operation. It consists of that maintenance

c. Maintenance Functions, Column (3). This column

necessary to restore an item to completely serviceable

lists the various maintenance functions (A through K)

condition as prescribed by maintenance standards in

and indicates the lowest maintenance category

technical publications for each item of equipment.

authorized to perform these functions. The symbol

Overhaul normally does not return an item to like new,

designations for the various maintenance categories are

zero mileage, or zero hour condition.

as follows:

K - Rebuild. The highest degree of material

maintenance. It consists of restoring equipment as

C - Operator or crew

nearly as possible to new condition in accordance with

O - Organizational maintenance

original manufacturing standards. Rebuild is performed

F - Direct support maintenance

only when required by operational considerations or

H - General support maintenance

other paramount factors and then only at the depot

D - Depot maintenance

maintenance category. Rebuild reduces to zero the

hours or miles the equipment, or component thereof, has

The maintenance functions are defined as follows:

been in use.

Tools and Equipment, Column (4).

Not

A - Inspect. To determine serviceability of an

applicable.

item by comparing its physical, mechanical, and

c. Remarks, Column (5). This column is provided

electrical characteristics with established standards.

for referencing by code the remarks (sec. IV) pertinent to

B - Test. To verify serviceability and to detect

the maintenance functions.

electrical or mechanical failure by use of test equipment.

B-3.

Explanation of Columns in Section IV

C - Service. To clean, to preserve, to charge,

a. Reference Code. This column consists of two

and to add fuel, lubricants, cooling agents, and air. If it is

letters separated by a dash, both of which are references

desired that

to section II. The first letter references column (5) and

the second letter references a maintenance function,

column (3), A through K.

b. Remarks. This column lists information pertinent

to the maintenance function being performed, as

indicated on the MAC, Section II.

B-1