MAINTENANCE ALLOCATION CHART - TM-9-4120-430-140297

TM 9-4120-430-14

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MAINTENANCE ALLOCATION CHART

AIR CONDITIONER, COMPACT, HORIZONTAL

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.

This MAC utilizes the Two-Level Maintenance (TLM) System that combines the Unit and Direct Support (DS) levels of

maintenance, under the heading of Field Maintenance. Similarly, the combination of GS and Depot levels are combined

under the heading of Sustainment Maintenance. On-System Maintenance characterizes field maintenance, and it

normally repairs equipment and returns it to the user. Sustainment Maintenance is characterized by off-system

maintenance and primarily repairs and returns equipment to the supply system.

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:

Field...includes two subcolumns, Unit (C (operator/crew) and O (unit) maintenance) and Direct Support (F)

maintenance

Sustainment...includes two subcolumns, general support (H) and depot (D).

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 will be 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).

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.

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

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

gases.

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

operating characteristics to specified parameters.

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

Calibrate. To determine the cause and corrections to be made or adjusted 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.

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