ARMY TM 9-6115-672-14
AIR FORCE TO 35C2-3-444-32
MARINE CORPS TM 09244A/09245A-14
MAINTENANCE ALLOCATION CHART (MAC)
SECTION I. INTRODUCTION
This section 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 generator set and its components. The application
of the maintenance functions to the generator set or component will be consistent with the capacities
and capabilities of the designated maintenance categories.
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 particular maintenance
B.2 MAINTENANCE FUNCTIONS. Maintenance Functions are 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 (i.e., by sight, sound, or feel).
Test. To verify serviceability by measuring the mechanical 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, i.e., to clean
(includes decontamination, when required), preserve, drain, paint, or replenish fuel, lubricants,
chemical fluids, or gases.
Adjust. To maintain or regulate, within prescribed limits, by bringing into proper 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
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.