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4-1 INTRODUCTION. This chapter contains preventive maintenance procedures to be accomplished on a
scheduled basis. The scheduled maintenance instructions in this manual are canceled when the Planned Maintenance
System (PMS) is implemented for this equipment aboard your ship or station.
4-2 MAINTENANCE PROCEDURES. Correct operation of the transducer should be verified every 180 days
by performing a check at the system level. This check will consist of verifying the reading of the appropriate Demand
Display Indicator (DDI) or meter when the applied pressure is 0 psig or 0 psia, whichever is appropriate, and also
when the applied pressure is 100% of the transducer's range. If the readings are within the tolerances prescribed by
the applicable system maintenance requirements, no further action is necessary. If the readings are not within
tolerances, the transducer calibration should be verified and adjusted, if necessary. If the pressure transducer cannot
be adjusted, it should be examined to determine whether there are any loose connections or other repairable
discrepancies that might be the cause of the problem. If the pressure transducer cannot be adjusted and no repairable
discrepancies can be found, it should be replaced.
Do not attempt to adjust the DDI or meter readings by turning the transducer ZERO or
SPAN potentiometer.
4-1
CHAPTER 4
SCHEDULED MAINTENANCE
CAUTION
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