f. Calibrate. To determine and cause correc-
C - 1 . General
tions to be made or to be adjusted on instru-
This appendix provides a summary of the main.
ments or test measuring and diagnostic equip-
tenance operations for Handset, H-189-GR. It
ments used in precision measurement. Consists
authorizes categories of maintenance for spe-
of comparisons of two instruments, one of
cific maintenance functions on repairable items
which is a certified standard of known accuracy,
and components and the tools and equipment
to detect and adjust any discrepancy in the
required to perform each function. This appen-
accuracy of the instrument being compared.
dix may be used as an aid in planning main-
g. Install. The act of emplacing, seating, or
fixing into position an item, part, module (com-
ponent or assembly) in a manner to allow the
C-2. Maintenance Function
proper functioning of the equipment or system.
Maintenance functions will be limited to and
h. Replace. The act of substituting a service-
defined as follows:
able like type part, subassembly, or module
(component or assembly) for an unserviceable
a. Inspect. To determine the serviceability of
an item by comparing its physical, mechanical,
and/or electrical characteristics with estab-
i. Repair. The application of maintenance
lished standards through examination.
services (inspect, test, service, adjust, align,
calibrate, replace ) or other maintenance actions
b. Test. To verify serviceability and to detect
(welding, grinding, riveting, straightening
incipient failure by measuring the mechanical
facing, remachining, or resurfacing) to restore
or electrical characteristics of an item and
serviceability to an item by correcting specific
comparing those characteristics with prescribed
damage, fault, malfunction, or failure in a part,
subassembly, module (component or assembly)
c. Service. Operations required periodically
end item, or system.
to keep an item in proper operating condition,
j. Overhaul. That maintenance effort (serv-
i.e., to clean (decontaminate), to preserve, to
ice/action) necessary to restore an item to a
drain, to paint, or to replenish fuel, lubricants,
completely serviceable/operational condition
hydraulic fluids, or compressed air supplies.
as prescribed by maintenance standards (i.e.,
d. Adjust. To maintain, within prescribed
DMWR) in appropriate technical publications.
limits, by bringing into proper or exact posi-
Overhaul is normally the highest degree of
tion, or by setting the operating characteristics
maintenance performed by the Army. Overhaul
to the specified parameters.
does not normally return an item to like new
e. Align. To adjust specified variable elements
k. Rebuild. Consists of those services/actions
of an item to bring about optimum or desired