MAINTENANCE ALLOCATION CHART (MAC) - TM-9-4120-423-14-P0447

TM9 4120-423-14&P

MAINTENANCE ALLOCATION CHART (MAC)

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INTRODUCTION

The Army Maintenance System MAC

This introduction provides a general explanation of all maintenance and repair functions authorized at

various maintenance levels under the standard Army Maintenance System concept.

The MAC (immediately following the introduction) 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 shall be consistent with the capacities and

capabilities of the designated maintenance levels, which are shown on the MAC in column (4) as:

Unit - includes two subcolumns, C (operator/crew) and O (unit) maintenance.

Direct Support - includes an F subcolumn.

General Support - includes an H subcolumn.

Depot - includes a D subcolumn.

The tools and test equipment requirements (immediately following the MAC) list the tools and test

equipment (both special tools and common tool sets) required for each maintenance function as

referenced from the MAC.

The remarks (immediately following the tools and test equipment requirements) contain supplemental

instructions and explanatory notes for a particular maintenance function.

Maintenance Functions

Maintenance functions are limited to and defined as follows:

Inspect. To determine the serviceability of an item by comparing its physical, mechanical,

and/or electrical characteristics with established standards through examination (e.g., by sight,

sound, or feel). This includes scheduled inspection and gagings and evaluation of cannon tubes.

Test. To verify serviceability by measuring the mechanical, pneumatic, hydraulic, or electrical

characteristics of an item and comparing those characteristics with prescribed standards on a

scheduled basis, i.e., load testing of lift devices and hydrostatic testing of pressure hoses.

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