(ARMY USE ONLY)
Section I. INTRODUCTION
not limited to welding, grinding, riveting, straighten-ing,
and replacement of parts other than the trial and error
replacement of running spare type items such as fuses,
This appendix provides a summary of the
lamps. or electron tubes.
maintenance operations covered in the equipment
OVERHAUL. Normally. the highest degree
literature for the TS-1843A/APX. It authorizes categories
of maintenance performed by the Army In order to
of maintenance for specific maintenance functions on
minimize time work in process is consistent with quality
repairable items and components and the tools and
and economy of operation.
It consists of that
equipment required to perform each function. This
maintenance necessary to restore an item to completely
appendix may be used as an aid in planning
serviceable condition as prescribed by maintenance
standards in technical publications for each item of
equipment. Overhaul normally does not re-turn an item
to like new, zero mileage, or zero hour condition.
k. REBUILD. The highest degree of material
Maintenance functions will be limited to and
maintenance. It consists of restoring equipment as
defined as follows:
a. INSPECT. To determine serviceability of
nearly as possible to new condition in accordance with
an item by comparing its physical, mechanical, and
original manufacturing standards. Rebuild is per-formed
electrical characteristics with established standards.
only when required by operation considerations or other
b. TEST. To verify serviceability and to detect
paramount factors and then only at the depot
incipient electrical or mechanical failure by use of special
maintenance category. Rebuild reduces to zero the
equipment such as gages, meters.
hours or miles the equipment. or component thereof.
accomplished with external test equipment and does not
has been in use.
include operation of the equipment and operator type
SYMBOLS. The uppercase letter placed in
tests using internal motors or indicating devices.
the appropriate column indicates the lowest level at
which that particular maintenance function is to be per-
c. SERVICE. To clean. to preserve. to
charge. and to add fuel, lubricants, cooling agents, and
air. If it is desirable that elements, such as painting and
lubricating. be defined separately. they may be so
Explanation of Format
d. ADJUST. To rectify to the extent necessary
Column 1, group number. Not applicable.
to bring into proper operating range.
e. ALIGN. To adjust two or more components
b. Column 2, Functional group: Column 2 lists
or assemblies of an electrical or mechanical system so
the noun names of components, assemblies.
that their functions are properly synchronized. This does
subassemblies and modules on which maintenance is
not include setting the frequency control knob of radio
CALIBRATE. To determine the corrections
c. Column 3, maintenance functions. Column
to be made in the readings of instruments or test equip-
3 lists the maintenance category at which performance of
ment used in precise measurement. Consists of the
the specific maintenance function is authorized.
comparison of two instruments, one of which is a
Authorization to perform a function at any category also
certified standard of known accuracy, to detect and
includes authorization to perform that function at higher
adjust any discrepancy in the accuracy of the instrument
categories. The codes used represent the various
being compared with the certified standard.
maintenance categories as follows:
To set up for use in an
operational environment such as an encampment, site,
h. REPLACE. To replace unserviceable items
with serviceable like items.
Direct Support Maintenance
REPAIR. To restore an item to serviceable
General Support Maintenance
condition through correction of a specific failure or
unserviceable condition. This function includes, but is