MAINTENANCE ALLOCATION CHART
SECTION I. INTRODUCTION
B.1. THE ARMY MAINTENANCE SYSTEM MAC.
This introduction (Section I) provides a general explanation of all maintenance and repair functions authorized at
various maintenance levels under the standard Army Maintenance System concept.
The Maintenance Allocation Chart (MAC) in Section II designates overall authority and responsibility for the
performance of maintenance functions on the Water Quality Analysis Set-Preventive Medicine, NSN 6630-01-
367-9402. The application of the maintenance functions to the end item or component will be consistent with the
capacities and capabilities of the designated maintenance levels, which are shown in 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.
Section III lists the tools and test equipment (both special tools and common tool sets) required for each
maintenance function as referenced from Section II.
Section IV contains supplemental instructions and explanatory notes for a particular maintenance function.
B.2. MAINTENANCE FUNCTIONS.
Maintenance functions are limited 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.
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,
Adjust. To maintain or regulate, within prescribed limits by bringing into proper position or by setting the
operation characteristics to specified parameters.
Align. To adjust specified variable elements of an item to bring about optimum or desired performance.
Calibrate. To determine and cause corrections to be made or to be adjusted on instruments or 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.
Remove/Install. To remove and install the same item when required to perform service or other maintenance
functions. Install may be the act of emplacing, seating, or fixing into position a spare, repair part or module
(component or assembly) in a manner to allow the proper functioning of an equipment or system.
Replace. To remove an unserviceable item and install a serviceable counterpart in its place. "Replace" is
authorized by the MAC and assigned maintenance level is shown as the third position code of the SMR code.