/ obturator plug \ 



Army M108B1 

 cartridge case 



M58 primer 



Figure 10. Cartridge assembly for 

 CEL 20K anchor. 



safe-and-arm device 



cartridge case 

 (M108B1) 



plug/obturator 



M41 gun tube 



Figure 11. Gun and cartridge assembly for CEL 

 20K anchor. 



Functionally, as the rod touches the seafloor, the 

 magnet located on the rod approaches the magnetic 

 switch, which is fixed relative to the fluke, and 

 momentarily closes it. The power source then acti- 

 vates the S/A device which in turn detonates the 

 cartridge. Above 50 feet firing is prevented by a 

 hydrostatic pressure switch that interrupts the nickel 

 cadmium battery power source, and by a hydrostatic- 

 ally activated mechanical interlock that prevents 

 motion of a firing pin in the S/A. Below 50 feet, 

 upon touchdown, the power source activates a valving 

 assembly that completes a gas flow path to the firing 



pin and releases the 1,100-psi nitrogen; this action 

 then causes a 400-psi shear disk above the firing pin 

 to rupture. After rupture, the pressure drives a firing 

 pin either into a detonator for the ordnance S/A or 

 directly into the M58 primer for the nonordnance 

 reusable S/A. 



The original S/A device is shown in Figure 15. 

 The base section of the S/A device, which was 

 adapted from the Navy Signal Underwater Sound 

 (SUS) charge, worked perfectly; however, problems 

 were encountered with sealing the 1,100-psi nitrogen. 

 The inflator was not a satisfactory means for sealing 



11 



