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TM 55-4920-383-13&P
h. Replace. To replace unserviceable items with
serviceable assemblies, subassemblies or parts.
i. Repair. To restore an item to serviceable con-
dition through correction of a specific failure or
unserviceable condition. This includes, but is not
limited to, inspection, cleaning, preserving, ad-
justing,
replacing,
welding,
riveting,
and
strengthening.
j. Overhaul. To restore an item to a completely
s e r v i c e a b l e c o n d i t i o n a s p r e s c r i b e d by
maintenance serviceability standards prepared
and published for the specific item to be overhaul-
ed.
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, in-
spection 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 col-
umns 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 addi-
tion, 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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