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  1. INSPECTION To determine serviceability of an item by comparing its physical, mechanical, and electrical characteristics with established standard.

  2. TEST To verify serviceability and to detect incipient electrical or mechanical failure by use of special equipment such as gages, meters etc. This accomplished with external test equipment and does not include operation of the equipment and operator type tests using internal meters or indicating devices.

  3. SERVICE. To clean, to preserve, to charge, and to add fuel, lubricants, cooling agents, and air. If it is desired that elements, such as painting and lubricating, be defined seperately, they may be so listed.

  4. ADJUST. To rectify to the extent necessary to bring into proper operating range.

  5. ALIGN. To adjust two or more components or assemblies of an electrical or mechanical system so that their functions are properly synchronized. This does not include setting the frequency control knob of radio receivers or transmitters to the desired frequency.

  6. CALIBERATE. To determine the corrections to be made in the readings of instruments or test equipment used in precise measurement. Consists of the comparison 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 with the certified standard.

  7. INSTALL. To set up for use in an operational environment such as an encampment, site, or vehicle.

  8. REPLACE. To replace unserviceable items with serviceable like items.

  9. REPAIR. To restore an item to serviceable condition through correction of a specific failure or unserviceable condition. This function includes, but is not limited to welding, grinding, reviting, straightening, and replacement of parts other than the trial and error replacement of running spare type items such as fuses, lamps, or electronic tubes


OVERHAUL. Normally, the highest degree of maintenance performed by the Army in order to minimize time work in process is consistent with quality and economy of operation. It consists of that maintenance necessary to restore an item to completly serviceable condition as prescribed by maintenance standards in technical publications for each item of equipment. Overhaul normally does not return an item to like new, zero milleage, zero hour condition.


REBUILT The highest degree of material maintenance. It consists of restoring equipment as nearly as possible to new condition in accordance with original manufacturing standards. Rebuild is performed only when required by operational considerations or other paramount factors ant then only at the depot maintenance category. Rebuild reduces to zero the hours or miles the equipment, or component thereof, has been in use.


SYMBOLS The uppercase letter placed in the appropriate column indicates the lowest level at which that particular maintenance function is to be performeb

B-3. Explanation of Format

  1. Column 1 Group number Column 1 lists group numbers, the purpose of which is to identify components, assembles, subassemblies, subassemblies and moduls on which maintenance is authorized.

  2. Column 3, maintenance functions Column 3 lists the maintenance category at which performance of the specific maintenance function is authorized. Authorization to perform a function at any category also includes authorization to perform that funtion at higher categories. The codes used represent the variouse maintenance categories as follows:

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