MAINTENANCE ALLOCATION CHART
SERVICING UNIT, COMPRESSED GAS, MOBILE
Section I. INTRODUCTION
This section provides a general explanation of all maintenance and repair functions authorized at
the various maintenance levels.
The Maintenance Allocation Chart (MAC) in Section II 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 will be consistent with the capacities
and capabilities of the designated maintenance levels.
Section Ill 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
Maintenance functions will be 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 (e.g., by sight, sound, or feel).
b. Test. To verify serviceability by measuring the mechanical, pneumatic, hydraulic, 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 (includes decontamination when required), to replace filter, to preserve, to drain, to paint, or to replenish
fuel, lubricants, chemical fluids, or gases.
Adjust. To maintain or regulate, within prescribed limits, by bringing into proper or exact 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 placing, 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 Is shown as the third position of the SMR code.