This paper describes the evolution and ongoing engineering effort to increase instrument reliability and maintain high data quality i n NOAA's National Ti de and Water Level Observation Network. In 1978, data sets were below desired qual i t y because extensive processing was necessary t o obtain the required data products. A corrective maintenance program was initiated to provide an immediate short term solution. Parallel efforts t o correct manufacturing design deficiencies and improve long term reliability were initiated. Modified instruments were then subjected t o a rigorous reliability test program. The successful test results provided the impetus to undertake a pilot project to upgrade a portion of the Network i n conjunction w i t h the introduction of an Integrated Logistics Support Plan. In 1979, over 60 stations were upgraded w i t h a significant increase i n the reliability and data quality. A n additional two hundred stations were designated for upgrade i n 1980. In 1981, the p i l o t project is transitioning i n t o an upgrade program t o complete the entire network.
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