688 Class ventilation fans 6 and 7 shock hazard.

ETCS (SS) May

A number of 688 class boats have discovered voltage present on the shaft of the operating switches for ventilation fans 6 and 7. These controllers are of a different design than other fan controllers on board. The voltage may vary with switch position, but values of greater than 30 volts have been measured. A&I N3470 has been issued to eliminate this shock hazard.

A&I N3470, Install Ground Wires on Vent Fan 6 & 7 Remote Operators. This A&I is applicable to SSNs 688,690, 691, 698-701, 705, 706, 711, 713-715, 717, 719-725 and 750. Also, SSNs 751-773 that do not use rotary snap switches for ventilation fans 6 and 7. Ready for issue (RFI) material to accomplish the A&I became available in Feb 2009. This is a category B A&I which indicates that the fleet has two years from the time the material is made RFI to complete the alteration (Feb 2011). The A&I can be downloaded at the following SIRP website: http://www.fleetforces.navy.smil.mil/comsubfor/N4/default.aspx Direct questions or comments regarding the technical content of this A&I to the SSN 688 class planning yard: Earl Koepcke, phone [phone]. NAVSEA point of contact is: MR. Rick Kurek, [phone], e-mail [e-mail].