TM 10-5430-245-13&P
OPERATOR'S AND UNIT MAINTENANCE
DRUM, FABRIC, COLLAPSIBLE, DRINKING WATER,
500 GALLON CAPACITY
SUPPORTING INFORMATION
MAINTENANCE ALLOCATION CHART (MAC) INTRODUCTION
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 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 maintenance (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 inspections 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.
c. Clean. To rid the item of contamination.
d. Touch up. To spot paint scratched or blistered surfaces.
e. Mark. To restore obliterated identification.
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