INTRODUCTION FOR MAINTENANCE ALLOCATION CHART (MAC)

TM 9-4120-428-14

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OPERATOR'S, UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE

AIR CONDITIONER, HORIZONTAL, COMPACT

(NSN 4120-01-502-1319)

INTRODUCTION FOR MAINTENANCE ALLOCATION CHART (MAC)

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:

1. 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.

2. 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.

3. Service. Operations required periodically to keep an item in proper operating condition; e.g., to clean (includes

decontaminate, when required), to preserve, to drain, to paint, or to replenish fuel, lubricants, che mical fluids, or gases.

This includes scheduled exercising and purging of recoil mechanisms.

4. Adjust. To maintain or regulate, within prescribed limits, by bringing into proper position, or by setting the operating

characteristics to specified parameters.

5. Align. To adjust specified variable elements of an item to bring about optimum or desired performance.

6. Calibrate. To determine and cause corrections to be made or to be adjusted on instruments of test, measuring, and

diagnostic equipment used in precision measurement. 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.

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