B-4
B-5
TM 55-2840-231-23
i.
Repair. The application of maintenance services or other maintenance actions to restore service-
ability to an item by correcting specific damage, fault, malfunctions, or failure in a part, subassembly,
module (component or assembly), end item, or system.
j.
Overhaul. That maintenance effort (service/action) necessary to restore an item to a completely
serviceable/operational condition as prescribed by maintenance standards (i.e. DMWR) in appropriate tech-
nical publications. Overhaul is normally the highest degree of maintenance performed by the Army. Over-
haul does not normally return an item to like new condition.
k.
Rebuild. Consists of those services/actions necesssary for the restoration of unserviceable equipment
to a like new condition in accordance with original manufacturing standards. Rebuild is the highest degree
of material maintenance applied to Army equipment. The rebuild operation includes the act of returning
to zero those age meaaurements:(houm/mfles, etc.) considered in classifying &my equipments/components.
The standard groupings shown below are used, as applicable, throughout this MAC. Maintenance manuals
and RPSTLs will reflect these standard groupings as individual chapters with sections in each chapter rela-
tive to the individual complete systems, subsystems, modules components, assemblies, or specific parts
noted.
The letters “AVUM, AVIM and Depot” as placed on the Maintenance Allocation Chart, indicate the
level of Maintenance responsible for performing the particular maintenance function based upon assigned
skills, tools and test equipment and time required to accomplish maintenance.
Group
Number
0400
0401
0402
0403
0404
Description
ENGINE SYSTEM
ENGINE GENERAL
Servicing, handling, inspection requirements, lubrication charts, overhaul &
retirement schedules. External lines & hoses. (As applicable.)
COMPRESSOR SECTION
Rotor, blades, vanes, impeller, stators, inlet guide vanes, main frame, particle
separator, bleed valve, bearings, seals external lines & hoses.
COMBUSTION SECTION
Liners, nozzles, stators, rotor, seals, couplings, blades.
POWER-TURBINE
Nozzles, rotors, blades, exit guide vanes, exhaust frame, drive shaft, bearings,
seals, external lines & hoses.
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