Appendix B. MAINTENANCE ALLOCATION CHART

TM 9-6920-361-13&P

APPENDIX B

MAINTENANCE ALLOCATION CHART

Section I. INTRODUCTION

B-1. General.

f. Calibrate. To determine and cause corrections

to be made or to be adjusted on instruments or test

a. This section provides a general explanation of all

measuring and diagnostic equipments used in precision

maintenance and repair functions authorized at various

measurement.

Consists of comparisons of two

maintenance levels.

instruments, one of which is a certified standard of

known accuracy, to detect and adjust any discrepancy in

b. The Maintenance Allocation Chart (MAC) in

the accuracy of the instrument being compared.

section II designates overall responsibility for the

performance of maintenance functions on the identified

g. Install. The act of emplacing, seating, or fixing

end item or component. The implementation of the

into position an item, part, or module (component or

maintenance functions upon the end item or component

assembly) in a manner to allow the proper functioning of

will be consistent with the assigned maintenance

an equipment or system.

functions.

h. Replace. The act of substituting a serviceable

c. Section III lists the special tools and test

like type part, subassembly, or module (component or

equipment required for each maintenance function as

assembly) for an unserviceable counterpart.

referenced from section II.

i. Repair.

The application of maintenance

d. Section IV contains supplemental instructions on

services or other maintenance actions to restore

explanatory notes for a particular maintenance function.

serviceability to an item by correcting specific damage,

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

B-2. Maintenance Functions.

module (component or assembly), end item, or system.

a. Inspect. To determine the serviceability of an

j. Overhaul.

That

maintenance

effort

item by comparing its physical, mechanical and/or

(services/actions) necessary to restore an item to a

electrical characteristics with established standards

completely

serviceable/operational

condition

through examination.

prescribed by maintenance standards (i.e., DMWR) in

appropriate technical publications. Overhaul is normally

b. Test. To verify serviceability and detect incipient

the highest degree of maintenance performed by the

failure by measuring the mechanical or electrical

Army. Overhaul does not normally return an item to like

characteristics of an item and comparing those

new condition.

characteristics with prescribed standards.

k. Rebuild. Consists of those services/ actions

c. Service. Operations required periodically to

necessary for the restoration of unserviceable equipment

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

to a like new condition in accordance with original

(decontaminate), to preserve, to drain, to paint, or to

manufacturing standards. Rebuild is the highest

replenish fuel, lubricants, hydraulic fluids, or compressed

degree of materiel maintenance applied to Army

air supplies.

equipment. The rebuild operation includes the act of

returning to zero those age measurements (hours/miles,

d. Adjust. To maintain, within prescribed limits, by

etc.) considered in classifying Army equipments/

bringing into proper or exact position, or by setting the

components.

operating characteristics to specified parameters.

e. Align. To adjust specified variable elements of

an item to bring about optimum or desired performance.

Services - inspect, test, service, adjust, align, calibrate, or replace.

Action - welding, grinding, riveting, straightening, facing, remachining, or resurfacing.

B-1