Appendix B. MAINTENANCE ALLOCATION CHART (MAC)

TM 55-8145-203-13&P

MAINTENANCE ALLOCATION CHART (MAC)

SECTION I. INTRODUCTION

B-1 GENERAL.

a. This Appendix provides a general explanation of all maintenance and repair functions authorized at various maintenance

levels for the Tricon Container.

b. The Maintenance Allocatio n Chart (MAC) in Section II designates overall authority and responsibility for the performance

of maintenance functions on the identified end item or component. The application of the maintenance functions to the end

item or component will be consistent with the capacities and capabilities of the designated maintenance levels.

c. Section III lists the tools and test equipment (both special tools and common tool sets) required for each maintenance

function as referenced from Section II.

d. Section IV contains supplemental instructions and explanatory notes for a particular maintenance function.

B-2 MAINTENANCE FUNCTIONS.

Maintenance functions for this equipment will be limited to and defined as follows:

a. Inspect. To determine the serviceability of an item by comparing its physical and mechanical characteristics with

established standards through examination.

b. Test. To verify serviceability and to detect incipient failure by measuring the mechanical and/or electrical characteristics of

an item and comparing those characteristics with prescribed standards.

c. Service. Operations required periodically to keep an item in proper operating condition, i.e., to clean (includes

decontamination, when required), preserve, drain, paint, or to replenish fuel, lubricants, chemical fluids, or gases.

d. Adjust. Maintain or regulate within prescribed limits, by bringing in to proper or exact position, or by setting the operating

characteristics to the specified parameters.

e. Align. 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 by adjustment or alignment on instruments or test measuring and

diagnostic equipment used in precision measurement. This consists of comparisons of two instruments, one of which is a

certified standard of known accuracy, to detect and adjust any discrepancy in the accuracy of the instrument being

compared.

g. Remove/Install. To remove and install the same item when required to perform service or other maintenance functions.

Install may be the act of emplacing, seating, or fixing into position an item, part, or module (component or assembly) in a

manner to allow the proper functioning of the equipment or system.

h. Replace. To remove an unservic eable item and install a serviceable counterpart in its place. Replace is authorized by the

MAC and is shown as the third position code of the SMR code.

i. Repair. The application of maintenance services (inspect, test, service, adjust, align, calibrate, and/or replace) including

fault location/troubleshooting, removal/installation, and disassembly/assembly procedures, and maintenance actions

(welding, grinding, riveting, straightening, facing, remachining, or resurfacing) to identify troubles and restore

serviceability to an item by correcting specific damage, fault, malfunction, or failure in a part, subassembly, module

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

B-3 EXPLANATION OF COLUMNS IN THE MAC, SECTION II.

a. Column 1, Group Number. Column 1 lists functional group code numbers, the purpose of which is to identify maintenance

significant components, assemblies, subassemblies, and modules with the next higher assembly. End item group number

shall be "00".

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