ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
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TACTICAL WATER PURIFICATION SYSTEM (TWPS)
SUPPORTING INFORMATION
MAINTENANCE ALLOCATION CHART (MAC)
4. Adjust. To maintain or regulate, within prescribed limits, by bringing into proper position, or by
setting the operating characteristics to specified parameters.
5. Align. To adjust specified variable elements of an item to bring about optimum or desired
performance.
6. Calibrate. To determine and cause corrections to be made or to be adjusted on instruments of
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.
7. 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.
8. 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 Source, Maintenance and Recoverability (SMR) code.
9. Repair. The application of maintenance services, including fault location and troubleshooting,
removal and installation, disassembly and 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.
NOTE
The following definitions are applicable to the "repair" maintenance function:
Services Inspect, test, service, adjust, align, calibrate, and/or replace.
Fault location/troubleshooting The process of investigating and detecting the
cause of equipment malfunctioning; the act of isolating a fault within a system or
Unit Under Test (UUT).
Disassembly/assembly The step-by-step breakdown (taking apart) of a
spare/functional group coded item to the level of its least component, that is
assigned an SMR code for the level of maintenance under consideration (i.e.,
identified as maintenance significant).
Actions Welding, grinding, riveting, straightening, facing, machining, and/or
resurfacing.
10. Overhaul. That maintenance effort (service/action) prescribed to restore an item to a completely
serviceable/operational condition as required by maintenance standards in appropriate technical
publications. Overhaul is normally the highest degree of maintenance performed by the Army.
Overhaul does not normally return an item to like new condition.
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