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Thresher / Permit control surface bearing blocks & Hydrophone end plates

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  • #16
    I've found a bit more information on the period when the BQG-2A Sonar arrays were likely to have been fitted to both SSN-596 Barb and SSN-593 Thresher.

    Navsource has an article detailing the operational history of Barb in the 1963-1972 period;

    The BQG-2A array appears to have been installed during the Post Shakedown Availability refit at Mare Island in December 1963 and is noted as being "replaced" during drydocking at Pearl Habour in December 1969.

    Recently a number of documents on the loss of the Thresher were declassified, including testimony from the court of enquiry. Links to the documents can be found here;

    There are several references to the installation of an updated version of the PUFFS array during the Post Shakedown Availability refit from July 1962 to April 1963 (An earlier version of the PUFFS system was already fitted). Thresher was subsequently lost during her initial post refit shakedown cruise on 9 April 1963.