MAINTENANCE ALLOCATION CHART
a. This section provides a general explanation of all maintenance and repair functions authorized at various
b. The Maintenance Allocation Chart (MAC) in paragraph E-3 designates overall responsibility for the performance
of maintenance functions on the identified end item or component. The implementation of the maintenance functions
upon the end item or component will be consistent with the assigned maintenance functions.
c. Paragraph E-4 lists tools and test equipment required for a particular maintenance function as referenced from
d. Paragraph E-5 contains supplemental instructions and explanatory notes for a particular maintenance function as
E-2. MAINTENANCE FUNCTIONS
a. Inspect. To determine the serviceability of an item by comparing its physical, mechanical and/or electrical
characteristics with established standards through examination.
b. Test. To verify serviceability and detect incipient failure by measuring the mechanical 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
(decontaminate), to preserve, to drain, to paint, or to replenish fuel, lubricants, hydraulic fluids, or compressed air
d. Adjust. To maintain, within prescribed limits, by bringing into proper or exact position, or by setting the
operating characteristics to specified parameters.
e. Align. 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, 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.
g. Install. The act of emplacing, seating, or fixing into position an item, part, or module (component or assembly)
in a manner to allow the proper functioning of an equipment or system.
h. Replace. The act of substituting a serviceable like part, subassembly, or module (component or assembly) for
an unserviceable counterpart.
i. Repair. The application of maintenance services or other maintenance actions to 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.