ARMY TM 9-6115-641-24
AIR FORCE TO 35C2-3-456-12
MAINTENANCE ALLOCATION CHART (MAC)
Section 1. INTRODUCTION
a. This section provides a general explanation of all maintenance and repair functions authorized at various
b. The Maintenance Allocation Chart (MAC) in Section II designates overall authority and responsibility for
the performance of maintenance functions on the T.Q. Generator Sets and its components. The application of the
maintenance functions to the generator sets or components will be consistent with the capacities and capabilities of
the designated maintenance categories.
c. Section Ill lists the tools and test equipment (both special tools and common tool sets) required for each
maintenance function as referenced from Section Il.
d. Section IV contains supplemental instructions and explanatory notes for particular maintenance functions.
B-2 MAINTENANCE FUNCTIONS. Maintenance functions will be limited to and defined as follows:
a. 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).
b. Test. To verify serviceability by measuring the mechanical, pneumatic, or electrical characteristics of an
item and comparing those characteristics with prescribed standards.
c. Service. Operations required periodically to keep an item in proper operating condition, i.e., to clean (in-
clude decontaminate, when required), to preserve, to drain, to paint, or to replenish fuel, lubricants, chemical fluids, or
d. Adjust. To maintain or regulate, within prescribed limits, by bringing into proper or exact position, or by
setting the operating characteristics to specified parameters.
e. Aline. To adjust specified variable elements of an item to bring about optimum or desired performance.
f. Calibrate. To determine and cause corrections to be made or to be adjusted on instruments or Test, Mea-
suring, and Diagnostic Equipment (TMDE) used in precision measurement. Consists of comparisons of two instru-
ments, one of which is a certified standard of known accuracy, to detect and adjust any discrepancy in the accuracy
of the instrument being compared.
g. Remove/lnstall. To remove and install the same item when required to perform service or other mainte-
nance 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.
h. Replace. To remove an unserviceable item and install a serviceable counterpart in its place. Replace is
authorized by the MAC and is shown as the 3rd position code of the SMR code.
i. Repair. The application of maintenance services, including fault location/troubleshooting, removal/installa-
tion and disassembly/assembly procedures, and maintenance actions to identify troubles and restore serviceability to
an item by correcting specific damage, fault, malfunction, or failure in a part, subassembly, module (component or
assembly), end item, or system.
j. Overhaul. That maintenance effort (service/action) prescribed to restore an item to a completely service-
able/operational condition as required by maintenance standards in appropriate technical publications (i.e., DMWR).
Overhaul is normally the highest degree of maintenance performed by the Army. Overhaul does not normally return
an item to like new condition.
k. Rebuild. Consists of those services/actions necessary for the restoration of unserviceable equipment to a
like new condition in accordance with original manufacturing standards. Rebuild is the highest degree of material
maintenance applied to Army equipment. The rebuild operation includes the act of returning to zero those age mea-
surements (hours/miles, etc.) considered in classifying Army equipment/components.