APPENDIX C

TM 5-4110-204-13

APPENDIX C

Section I. INTRODUCTION

The Army Maintenance System MAC

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

maintenance levels under the Two-Level 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:

Field - includes two columns, Unit maintenance and Direct Support maintenance. The Unit maintenance

column is divided again into two more subcolumns, C for Operator or Crew and O for Unit 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 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,

chemical fluids, or gases. This includes scheduled exercising and purging of recoil mechanisms. The

following are examples of service functions:

a. Unpack. To remove from packing box for service or when required for the performance of

maintenance operations.

b. Repack. To return item to packing box after service and other maintenance operations.

Clean. To rid the item of contamination.

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