Section I. INTRODUCTION
to be made in the readings of instruments or test
equipment used in precise measurement. Consists
This appendix provides a summary of the mainte-
of the comparison of two instruments, one of
nance operations covered in the equipment litera-
which is a certified standard of known accuracy,
ture for Philco Express Orderwire Multidirection
to detect and adjust any discrepancy in the ac-
Unit. It authorizes categories of maintenance for
curacy of the instrument being compared with
specific maintenance functions on repairable
the certified standard.
items and components and the tools and equip-
ment required to perform each function. This ap-
g. INSTALL. TO set up for use in an operation-
pendix may be used as an aid in planning main-
al environment such as an encampment, site, or
h. REPLACE. To replace unserviceable items
with serviceable like items.
B-2. Maintenance Functions
Maintenance functions will be limited to and de
i. REPAIR. To restore an item to serviceable
fined as follows :
condition 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
spare type items such as fuses, lamps, or electron
b. TEST. To verify serviceability and to detect
incipient electrical or mechanical failure by use
j. OVERHAUL. Normally, the highest degree
of special equipment such as gages, meters, etc.
of maintenance performed by the Army in order
This is accomplished with external test equipment
to minimize time work in process is consistent
and does not include operation of the equipment
with quality and economy of operation. It consists
and operator type tests using internal meters or
of that maintenance necessary to restore an item
to completely serviceable condition as prescribed
by maintenance standards in technical publica-
c. SERVICE. To clean, to preserve, to charge,
tions for each item of equipment. Overhaul nor-
and to add fuel, lubricants, cooling agents, and
mally does not return an item to like new, zero
air. If it is desired that elements, such as paint-
mileage, or zero hour condition.
ing and lubricating, be defined separately, they
may be so listed.
k. REBUILD. The highest degree of materiel
maintenance. It consists of restoring equipment
ct. ADJUST. To rectify to the extent necessary
to bring into proper operating range.
as nearly as possible to new condition in accord-
ance with original manufacturing standards. Re-
e. ALIGN. To adjust two or more components
build is performed only when required by opera-
or assemblies of an electrical or mechanical sys-
tional considerations or other paramount factors
tem so that their functions are properly synchro-
and then only at the depot maintenance category.
nized. This does not include setting the frequency
Rebuild reduces to zero the hours of miles the
control knob of radio receivers or transmitters
equipment, or component thereof, has been in use.
to the desired frequency.
f. CALIBRATE. To determine the corrections
i. SYMBOLS. The uppercase letter placed in