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                                   BULLETIN
                 FSB-009 - TRANSDUCER CARE (URETHANE COATING)
                  DATE/REV:  12APR89 / 0 (previously FSB 1-9)
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ABSTRACT:  Describes a transducer problem associated with the urethane coating
on some older narrowband ADCPs (NBADCP).

INSTRUMENT/PROGRAM AFFECTED:  All narrowband ADCPs.

DESCRIPTION:  The urethane coating on the transducer faces sometimes shrinks
and pulls away from the edge of the transducer cup.  If this occurs, a leak
may develop risking the entire system.

SOLUTION/ACTION:  Inspect the transducer before and after deployments for
signs that the urethane may be shrinking or pulling away from the edges of the
cup.  If you have this problem, call RDI.  RDI has developed a urethane ring
that reduces this problem.

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