Float technology progress - Riser - Argo
Float technology progress - Riser - Argo
Float technology progress - Riser - Argo
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ACTIONS<br />
(1) The cause was found (by D. Swift) to be an inability of the solenoid to latch<br />
closed over the duration of an applied transient current. If the duration of the<br />
transient current was increased, the solenoid would always latch properly. There<br />
are no known changes in the controller electronics or the solenoid itself that<br />
would lead to this problem.<br />
(2) The problem can be corrected by adding a small, inexpensive (< $50) printed<br />
circuit board near the solenoid that regulates the current to the solenoid and<br />
insures that it always opens and closes on command. The board was designed<br />
by D. Swift, and 100 units were built commercially in Seattle. This fix has been<br />
added to all UW and PMEL floats since February 2011.<br />
(3) Individual floats can be tested for this problem by connecting a laptop prior<br />
to deployment and inflating the bladder.<br />
(4) Teledyne/Webb has been notified of this problem and the suggested remedy.<br />
As of March 1 2011 they have NOT instituted this remedy, and they continue to<br />
build and ship floats with this potential problem. It is not clear whether or not<br />
they intend to add the auxiliary PCB in their production process.
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