Functional Groups. - TM-55-4940-353-13-P0029

TM 55-4940-353-13&P

item, inspection of all parts or components, repair or

c. Service. To clean, to preserve, to charge, and

replacement of worn or unserviceable elements (items)

to add fuel, lubricants, cooling agents and air.

using original manufacturing tolerances and

specifications, and subsequent reassembly of the item.

d. Adjust. To rectify to the extent necessary to

bring into prosper operating range.

B-4.

Functional Groups.

e. Align. To adjust specified variable elements of

Standard functional groupings are not considered

an item to bring to optimum performance.

feasible for aviation ground support equipment due to

variation and complexity. Therefore, variations to

f. Calibrate. To determine the corrections to be

functional groupings may occur.

made in the reading of instruments or test equipment

used in precise measurement. Consists of the

B-5.

Maintenance Categories and Work Times.

comparison of two instruments, one of which is a

certified standard of known accuracy, to detect and

The maintenance categories (levels) AVUM, AVIM, and

adjust any discrepancy in the accuracy of the instrument

DEPOT are listed on the Maintenance Allocation Chart

or test equipment being compared with the certified

with individual columns that indicate the work times for

standard.

maintenance functions at each maintenance level Work

time presentations such as 0.1 indicate the average time

g. Install. To set up for use in an operational

it requires a maintenance level to perform a specified

environment such as an emplacement, site or vehicle.

maintenance function. If a work time has not been

established, the columnar presentation shall indicate "-".

h. Replace. To replace unserviceable items with

Maintenance levels higher than the level of

serviceable assemblies, subassemblies or parts.

maintenance indicated are authorized to perform the

indicated function

i. Repair. To restore an item to serviceable

condition through correction of a specific failure or

B-6.

Tools and Test Equipment (Section III).

unserviceable condition. This includes, but is not limited

to, inspection, cleaning, preserving, adjusting, replacing,

Common tool sets (not individual tools), special tools,

welding, riveting, and strengthening

test and support equipment required to perform

maintenance functions are listed alphabetically with a

j. Overhaul. To restore an item to a completely

reference number to permit cross-referencing to column

serviceable condition as prescribed by maintenance

5 in the MAC In addition, the maintenance category

serviceability standards prepared and published for the

authorized to use the device is listed along with the item

specific item to be overhauled k. Rebuild. To restore

National Stock Number (NSN) and, if applicable, the

an item to a standard as nearly as possible to the

tool number to aid in identifying the tool/device.

original or new condition in appearance, performance,

and life expectancy. This is accomplished through the

maintenance technique of complete disassembly of the

B-3