ishing liquids, pastes, or abra-
includes illegibility as applied to
sives for polishing window or
markings, data and caution plates,
mirror. To remove dust use only
and printed matter.
clean lens tissue paper.
(4) S u c h e x p r e s s i o n a s " r e p l a c e i f n e c -
( b ) Do not touch the mirror or win-
essaary" is not used in the specific
dow with the bare fingers. To
procedures. It is understood that
r e m o ve fingerprinta, oil, or
whenever inspection reveals the
grease from glass, apply alcohol
need of replacement, the necessary
with lens tissue paper, and wipe
action will be taken.
gently with c 1 e a n lens tissue
paper. If alcohol is not available
23. Preventive-Maintenance by
Operator(s)
and the temperature is above
a.
Purpose.
To
assure
maximum
opera-
freezing,
breathe
heavily
upon
tional readiness, it is necessary that the
g l a s s and wipe off with clean lens
equipment be systematically inspected at
tissue paper. Repeat this opera-
intervals every day it is operated, so de-
tion until clean.
fects may be discovered and corrected
Caution: The compass is sealed
before they result in serious damage or
to
withstand
dust,
dampness,and
failure.
Certain
scheduled
maintenance
variations of atmospheric condi-
services will be performed at these desig-
tions; however, the compass is
nated intervals. Any deficiencies discov-
not protected to resist steam,
ered that c a n n o t be corrected by the
air or water under high pressure.
operator, will be reported on DA Form
(2) Care in handling fire-control
2404.
equipment.
b. Daily Preventive-Maintenance Serv-
(a) The compass M2 is, in general,
ice. Each piece of equipment will be
suitably designed for functional
inspected each day that it is operated.
purposes. It will not, however,
This service is divided into three parts,
stand
rough
handling
or
abuse.
as indicated in (1) through (3) below.
Inaccuracy or malfunction-
ing will result from mistreat-
a
brief
service
to
ascertain
that
ment.
the equipment is ready for opera-
(b) Unnecessary turning of screws
tion it is mainly a check to see if
or other parts not incident to the
conditions affecting the item's
use of the compass is forbidden.
readiness have changed since the
( c ) Keep the compass as clean and
last-operation service.
dry as possible. If the compass
(2) D u r i n g - o p e r a t i o n s e r v i c e . T h i s
is wet, dry it carefully before
service consists of detecting un-
placing it in its carrying case.
satisfactory
performance.
(d) When not in use, keep the com-
(3) A f t e r - o p e r a t i o n s e r v i c e . T h i s i s
pass in its carrying case.
the basic daily service for the
( e ) Keep the exposed surfaces of the
equipment. It consists of correct-
mirror and window dry to prevent
ing, insofar as possible, any op-
scratching of the glass.
erating deficiencies. Thus the
equipment is prepared to operate
2 4 . Specific Procedures For First Echelon
upon a moment's notice.
There are no specific procedures for
c. Fire-Control Instruments.
first echelon, daily or weekly periodic
(1) G e n e r a l p r e c a u t i o n s i n c l e a n i n g .
maintenance checks or services.
(a) Under no circumstances use pol-