Section I. INTRODUCTION
straightening, facing, remachining, or resurfacing) to
restore serviceability to an item by correcting specific
This appendix provides a summary of the
damage, fault, malfunction, or failure in a part,
maintenance operations for PL-1399/U. It authorizes
subassembly, module (component or assembly), end
categories of maintenance for specific maintenance
item, or system.
functions on repairable items and components and the
tools and equipment required to perform each function.
This appendix may be used as an aid in planning
(service/action) necessary to restore an item to a
prescribed by maintenance standards (i.e., DMWR) in
C-2. Maintenance Function
appropriate technical publications. Overhaul is normally
Maintenance functions will be limited to and
the highest degree of maintenance performed by the
defined as follows:
Army. Overhaul does not normally return an item to like
a. Inspect. To determine the serviceability of an
item by comparing its physical, mechanical, and/or
k. Rebuild. Consists of those services/actions
electrical characteristics with established standards
necessary for the restoration of unserviceable equipment
to a like new condition in accordance-with original
b. Test. To verify serviceability and to detect
manufacturing standards. Rebuild is the highest degree
incipient failure by measuring the mechanical or
of materiel maintenance applied to Army equipment.
electrical characteristics of an item and comparing those
The rebuild operation includes the act of returning to zero
characteristics with prescribed standards.
those age measurements (hours, miles, etc.) considered
in classifying Army equipments/components.
c. Service. Operations required periodically to
keep an item in proper operating condition, i.e., to clean
C-3. Column Entries
(decontaminate), to preserve, to drain, to paint, or to
replenish fuel, lubricants, hydraulic fluids, or compressed
a. Column 1, Group Number. Column 1 lists group
numbers, the purpose of which is to identify components,
assemblies, subassemblies, and modules with the next
d. Adjust. To maintain, within prescribed limits, by
bringing into proper or exact position, or by setting the
operating characteristics to the specified parameters.
b. Column 2, Component/Assembly. Column 2
contains the noun names of components, assemblies,
e. Align. To adjust specified variable elements of
subassemblies, and modules for which maintenance is
an item to bring about optimum or desired performance.
f. Calibrate. To determine and cause corrections
c. Column 3, Maintenance Function. Column 3
to be made or to be adjusted on instruments or test
lists the functions to be performed on the item listed in
measuring and diagnostic equipments used in precision
column 2. When items are listed without maintenance
Consists of comparisons of two
functions, it is solely for purpose of having the group
instruments, one of which is a certified standard of
numbers in the MAC and RPSTL coincide.
known accuracy, to detect and adjust any discrepancy in
the accuracy of the instrument being compared.
d. Column 4, Maintenance Category. Column 4
specifies, by the listing of a 'work time" figure in the
g. Install. The act of emplacing, seating, or fixing
appropriate subcolumn(s), the lowest level of
into position an item, part, module (component or
maintenance authorized to perform the function listed in
assembly) in a manner to allow the proper functioning of
column 3. This figure represents the active time required
the equipment or system.
to perform that maintenance function at the indicated
h. Replace. The act of substituting a serviceable
category of maintenance. If the number or complexity of
like type part, subassembly, or module (component or
the tasks within the listed maintenance function vary at
assembly) for an unserviceable counterpart.
i. Repair. The application of maintenance services
(inspect, test, service, adjust, align, calibrate, replace) or
other maintenance actions (welding, grinding, riveting,