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4.1. PREVENTIVE MAINTENANCE
CHECKS AND SERVICES (PMCS)
4.1.1. PURPOSE OF PMCS
PMCS is performed daily when in use to be sure that the sight is
ready at all times. Procedures listed in Table 4-1 are a systematic
inspection of the PS-40 that will enable you to discover defects that
might cause the sight to fail on a mission.
4.1.2. PMCS PROCEDURES
The frequency of performing PMCS is as follows:
1. Daily when the sight is in use.
2. When it is removed from the case for any reason.
TABLE 4-1. PREVENTIVE MAINTENANCE CHECKS AND SERVICES
SEq.
ITEM TO
NO.
CHECK
Complete-
1
ness
2
Sight Body
objective
3
lens Cap
output lens
4
Cap
Battery Com-
5
partment
Function
6
Switch
4-2
CHECKING PROCEDURE
BEFORE OPERATION CHECKS
Inventory items by means
of comparing with the data
specified in this manual.
Inspect for missing screws
or rubber cap.
Inspect for cuts, tears and
dirt. Clean as required.
Inspect for dirt or o-ring
d a m a g e. C l e a n a s r e -
quired.
C h e c k f o r c o r r o s i o n ,
springs tension, cap dam-
aged or retainer broken.
Check o-ring for cuts or
damage.
Check for operation (with-
out battery).
NOT FULLY MISSION
CAPABLE IF:
Items missing.
Screws or rubber cap
missing.
Cap torn or cut.
Cap is not held up on
the lens housing.
Springs corroded or
d a m ag e d . r e t a i n e r
broken. Cap or o-ring
damaged or missing.
S w i tc h i n o p er at i ve.
Knob missing.
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