TM 11-5855-217-12
MAINTENANCE ALLOCATION
Section I. INTRODUCTION
ment used in precise measurement. Consists of the
C-1. General
comparison of two instruments, one of which is
This appendix provides a summary of the mainte-
a certified standard of known accuracy, to detect
nance operations covered in the equipment litera-
and adjust any discrepancy in the accuracy of the
ture for the AN/VSS-3. It authorizes categories
instrument being compared with the certified
of maintenance for specific maintenance functions
standard.
on repairable items and components and the tools
and equipment required to perform each function.
g. Install. To set up for use in an operational
This appendix may be used as an aid in planning
environment such as an encampment, site, or
maintenance operations.
vehicle.
h. Replace. To replace unserviceable items with
C-2. Maintenance Functions
serviceable like items.
Maintenance functions will be limited to and de-
i. Repair. To restore an item to serviceable con-
fined as follows:
dition through correction of a specific failure or
unserviceable condition. This function includes,
a. Inspect. To determine serviceability of an
but is not limited to welding, grinding, riveting,
item by comparing its physical, mechanical, and
straightening, and replacement of parts other
electrical characteristics with established stand-
than the trial and error replacement of running
ards.
spare type items such as fuses, lamps, or electron
b. Test. To verify serviceability and to detect
tubes.
incipient electrical or mechanical failure by use
j. Overhaul. Normally, the highest degree of
of special equipment such as gages, meters, etc.
maintenance performed by the Army in order to
This is accomplished with external test equipment
minimize time work in process is consistent with
and does not include operation of the equipment
quality and economy of operation. It consists of
and operator type tests using internal meters or
that maintenance necessary to restore an item to
indicating devices.
completely serviceable condition as prescribed by
c. Service. To clean, to preserve, to charge, and
maintenance standards in technical publications
to add fuel, lubricants, cooling agents, and air.
for each item of equipment. Overhaul normally
If it is desired that elements, such as painting
does not return an item to like new, zero mileage,
and lubricating, be defined separately, they may
or zero hour condition.
be so listed.
k. Rebuild. The highest degree of materiel
d. Adjust. To rectify to the extent necessary to
maintenance. It consists of restoring equipment as
bring into proper operating range.
nearly as possible to new condition in accordance
with original manufacturing standards. Rebuild
e. Align. To adjust two or more components or
is performed only when required by operational
assemblies of an electrical or mechanical system
considerations or other paramount factors and
so that their functions are properly synchronized.
then only at the depot maintenance category. Re-
This does not include setting the frequency control
build reduces to zero the hours or miles the equip-
knob of radio receivers or transmitters to the
ment, or component thereof, has been in use.
desired frequency.
l. Symbols. The uppercase letter placed in the
f. Calibrate. To determine the corrections to be
appropriate column indicates the lowest level at
made in the readings of instruments or test equip-
