Functional Groups. - TM-55-1730-226-130050

TM 55-1730-226-13

To restore an item to serviceable condition through correction of

i. Repair.

a specific failure or unserviceable condition. This includes, but is not limited

to, inspection, cleaning, preserving, adjusting, replacing, welding, riveting, and

strengthening.

j. Overhaul. To restore an item to a completely serviceable condition as

prescribed by maintenance serviceability standards prepared and published for the

specific item to be overhauled.

k. Rebuild. To restore an item to a standard as nearly possible to the

original or new condition in appearance, performance, and life expectancy. This

is accomplished through the maintenance technique of complete disassembly of

the item, inspection of all parts or components, repair or replacement of worn or

unserviceable elements (items) using original manufacturing tolerances and

specifications, and subsequent reassembly of the item.

Functional Groups.

B-4.

Standard functional groupings are not considered feasible for aviation ground

support equipment due to variation and complexity. Therefore, variations to

functional groupings may occur.

Maintenance Categories and Work Times.

B-5 .

The maintenance categories (levels) AVUM, AVIM, and DEPOT are listed on the

Maintenance Allocation Chart with individual columns that indicate the work times

for maintenance functions at each maintenance level, Work time presentations such

as 0.1. indicate the average time it requires a maintenance level to perform a

specified maintenance function. If a work time has not been established, the

columnar presentation shall indicate "-.-". Maintenance levels higher than the

level of maintenance indicated are authorized to perform the indicated function.

Tools and Test Equipment (Section III).

B-6 .

Common tool sets (not individual tools), special tools, test and support

equipment required to perform maintenance functions are listed alphabetically

with a reference number to permit cross-referencing to column 5 in the MAC.

In addition, the maintenance category authorized to use the device is listed

along with the item National Stock Number (NSN) and, if applicable, the tool

number to aid in identifying the tool/device.

B-4 Change