APPENDIX B MAINTENANCE ALLOCATION CHART

TM 3-1040-276-23

APPENDIX B

MAINTENANCE ALLOCATION CHART

Section I. INTRODUCTION

B-1. GENERAL.

d. Adjust. To maintain or regulate, within pre-

scribed limits, by bringing into proper or exact position,

a. This section provides a general explanation of

or by setting the operating characteristics to specified

all maintenance and repair functions authorized at vari-

parameters.

ous maintenance categories.

e. Aline. To adjust specified variable elements of

b. The Maintenance Allocation Chart (MAC) in sec-

an item to bring about optimum or desired perfor-

tion II designates overall authority and responsibility for

mance.

the performance of maintenance functions on the iden-

f. Calibrate. To determine and cause corrections

tified end item or component. The application of the

to be made or to be adjusted on instruments or test,

maintenance functions to the end item or component

measuring and diagnostic equipments used in precision

will be consistent with the capacities and capabilities of

measurement. Consists of comparisons of two instru-

the designated maintenance categories.

ments, one of which is a certified standard of known

c. Section Ill lists the tools and test equipment

accuracy, to detect and adjust any discrepancy in the

(both special tools and common tool sets) required for

accuracy of the instrument being compared.

each maintenance function as referenced from sec-

tion Il.

g. Remove/Install. To remove and install the

same item when required to perform service or other

d. Section IV contains supplemental instructions

maintenance functions. Install may be the act of

and explanatory notes for a particular maintenance

emplacing, seating, or fixing into position a spare,

function.

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

manner to allow the proper functioning of an equipment

B-2. MAINTENANCE FUNCTIONS. Maintenance

or system.

functions will be limited to and defined as follows:

h. Replace. To remove an unserviceable item and

a. Inspect. To determine the serviceability of an

install a serviceable counterpart in its place. "Replace"

item by comparing its physical, mechanical, and/or

is authorized by the MAC and is shown as the 3d posi-

electrical characteristics with established standards

tion code of the SMR code.

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

i. Repair. The application of maintenance ser-

b. Test. To verify serviceability by measuring the

vices1 including fault location/troubleshooting2,

mechanical, pneumatic, hydraulic, or electrical charac-

removal/installation, and disassembly/assembly3 pro-

teristics of an item and comparing those characteristics

cedures, and maintenance actions4 to identify troubles

with prescribed standards.

and restore serviceability to an item by correcting

c. Service. Operations required periodically to

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

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

subassembly, module (component or assembly), end

(includes decontaminate, when required), to preserve,

item, or system.

to drain, to paint, or to replenish fuel, lubricants, chemi-

cal fluids, or gases.

Services - inspect, test, service, adjust, aline, calibrate, and/or replace.

Fault locate/troubleshoot - The process of investigating and detecting the cause of equipment malfunctioning; the act of isolating a fault

within a system or unit under test (UUT).

Disassemble/assemble - encompasses the step-by-step taking apart (or breakdown) of a spare/functional group coded item to the level of

its least componency identified as maintenance significant (i.e., assigned as SMR code) for the category of maintenance under consideration.

Actions - welding, grinding, riveting, straightening, facing, remachining, and/or resurfacing.

B-1