Section I. INTRODUCTION
h. Replace. The act of substituting a serviceable
This appendix provides a summary of the
like type part, subassembly, or module (component or
maintenance operations for POWER SUPPLY PP-
assembly) for an unserviceable counterpart.
6224/U AND PP-6224A/U. It authorizes categories of
maintenance for specific maintenance functions on
i. Repair. The application of maintenance
repairable items and components and the tools and
services (inspect, test, service, adjust, align, calibrate,
equipment required to perform each function. This
replace) or other maintenance actions (yielding, grinding,
appendix may be used as an. aid in planning
riveting, straightening, facing, remachining, or
resurfacing) to restore serviceability to an item by
correcting specific damage, fault, malfunction, or failure
in a part, subassembly, module (component or
B-2. Maintenance Function
assembly), end item, or system.
Maintenance functions will be limited to and defined
j. Overhaul. That maintenance effort
(service/action) necessary to restore an item to a
a. Inspect. To determine the serviceability of an
completely serviceable/operational condition as
item by comparing its physical, mechanical, and/or
prescribed by maintenance standards (i.e., DMWR) in
electrical characteristics with established standards
appropriate technical publications. Overhaul is normally
the highest degree of maintenance performed by the
Army. Overhaul does not normally return an item to like
b. Test. To verify serviceability and to detect
incipient failure by measuring the mechanical or
electrical characteristics of an item and comparing those
k. Rebuild. Consists of those services/actions
characteristics with prescribed standards.
necessary for the restoration of unserviceable equipment
to a like new condition in accordance with original
c. Service. Operations required periodically to
manufacturing standards. Rebuild is the highest degree
keep an item in proper operating condition, i.e., to clean
of materiel maintenance applied to Army equipment.
(decontaminate), to preserve, to drain, to paint, or to
The rebuild operation includes the act of returning to
replenish fuel, lubricants, hydraulic fluids, or compressed
zero those age measurements (hours, miles, etc.)
considered in classifying Army equipments/components.
d. Adjust. To maintain, within prescribed limits, by
B-3. Column Entries
bringing into proper or exact position, or by setting the
operating characteristics to the specified parameters.
a. Column 1, Group Number. Column 1 lists group
numbers, the purpose of which is to identify
e. Align. To adjust specified variable elements of
components, assemblies, subassemblies, and modules
an item to bring about optimum or desired performance.
with the next higher assembly.
f. Calibrate. To determine and cause corrections
b. Column 2, ,Component/Assembly. Column 2
to be made or to be adjusted on instruments or test
contains the noun names of components, assemblies,
measuring and diagnostic equipments used in precision
subassemblies, and modules for which maintenance is
measurement. Consists of comparisons of two
instruments, one of which is a certified standard of
known accuracy, to detect and adjust any discrepancy in
c. Column 3, Maintenance Functions . Column 3
the accuracy of the instrument being compared.
lists the functions to be performed on the item listed in
column 2. When items are listed without maintenance
g. Install. The act of emplacing, seating, or fixing
functions, it is solely for purpose of having the group
into position an item, part, module (component or
numbers in the MAC and RPSTL coincide.
assembly) in a manner to allow theproper functioning of
the equipment or system.
Change 3 B-1