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TM 55-4920-412-13&P
in the accuracy of the instrument or test equipment being
compared with the certified standard.
g.
Install. To set up for use in an operational
environment such as an emplacement, site or vehicle.
h.
Replace. To replace unserviceable items with
serviceable assemblies, subassemblies or parts.
i.
Repair. To restore an item to serviceable
condition through correction of 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 as 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.
B-4. FUNCTIONAL GROUPS.
Standard functional groupings are not considered
feasible for aviation ground support equipment due to
variation and complexity. Therefore, variations to
functional groupings may occur.
B-5. MAINTENANCE CATEGORIES AND WORK '
TIMES.
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.
B-6. TOOLS AND TEST EQUIPMENT (Section III).
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-3
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