APPENDIX B MAINTENANCE ALLOCATION CHART

TM 3-1040-279-12&P

APPENDIX B

MAINTENANCE ALLOCATION CHART

Section I. INTRODUCTION

e. Align. To adjust specified variable ele-

B-1 GENERAL.

ments of an item to bring about optimum or de-

sired performance.

a. This section provides a general explana-

tion of all maintenance and repair functions

f. Calibrate. To determine and cause correc-

authorized at various maintenance categories.

tions to be made or to be adjusted on instruments

or, test measuring, and diagnostics equipment

b. The Maintenance Allocation Chart (MAC)

used in precision measurement. Consists of com-

in section II designates overall authority and

parisons of two instruments, one of which is a

responsibility for the performance of mainte-

certified standard of known accuracy, to detect

nance functions on the identified end item or

and adjust any discrepancy in the accuracy of the

component. The application of the maintenance

instrument being compared.

functions to the end item or component will be

consistent with the capacities and capabilities of

g. Remove/Install. To remove and install

the designated maintenance categories.

the same item when required to perform service

or other maintenance functions. Install may be

c. Section III lists the tools and test equip-

the act of emplacing, seating, or fixing into posi-

ment (both special tools and common tool sets)

tion a spare, repair part, or module (component

required for each maintenance function as refer-

or assembly) in a manner to allow the proper

enced from section II.

functioning of an equipment or system.

d. Section IV contains supplemental instruc-

h. Replace. To remove an unserviceable

tions and explanatory notes for a particular

item and install a serviceable counterpart in its

maintenance function.

place. "Replace" is authorized by MAC and is

shown as the 3rd position code of the SMR code.

i. Repair. The application of maintenance

B-2 MAINTENANCE FUNCTIONS.

services including fault location/troubleshooting,

removal/installation, and disassembly/assembly

procedures, and maintenance actions to identify

Maintenance functions will be limited to and

defined as follows:

troubles and restore serviceability to an item by

correcting specific damage, fault, malfunction, or

a. Inspect. To determine the serviceability of

failure in a part, subassembly, module (compo-

an item by comparing its physical, mechanical,

nent or assembly), end item, or system.

and/or electrical characteristics with established

j. Overhaul. That maintenance effort (serv-

standards through examination (e.g., by sight,

sound, or feel).

ice/action) prescribed to restore an item to a

completely serviceable/operational condition as

b. Test. To verify serviceability by measuring

required by maintenance standards in appropriate

the mechanical, pneumatic, hydraulic, or electri-

technical publications (i.e., DMWR). Overhaul is

cal characteristics of an item and comparing those

normally the highest degree of maintenance per-

characteristics with prescribed standards.

formed by the Army. Overhaul does not normally

return an item to like new condition.

c. Service. Operations required periodically

to keep an item in proper operating condition,

k. Rebuild. Consists of those services/actions

i.e., to clean (include decontaminate, when re-

necessary for the restoration of unserviceable

quired), to preserve, to drain, to paint, or to re-

equipment to a like new condition in accordance

plenish fuel, lubricants, chemical fluids, or gases.

with original manufacturing standards. Rebuild

is the highest degree of material maintenance

d. Adjust. To maintain or regulate, within

applied to Army equipment. The rebuild opera-

prescribed limits, by bringing into proper or exact

tion includes the act of returning to zero those

position, or by setting the operating character-

age measurements (hours/miles, etc.) considered

in classifying Army equipment/components.

istics to specified parameters.

B-1