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C39 OBJECTIVE: TERMINATE SRB THRUST WITHIN 10 SECONDS WITHOUT DAMAGE TO ORBITER, EXTERNAL TANK, OR PRIMARY STRUCTURE • EXPLOSIVELY CUT OPPOSING VENTING - PAIRS IN CYLINDER ABOVE NOXZZLE • NO ADDITIONAL THRUST AT SEVERANCE • VENTS SIZED TO CONTROL DECREASE IN THRUST/ACCELERATION • VENT DIAMETERS INCREASED (FURTHER SEVERANCE) AS PRESSURE DECAYS Figure C20 SRB Controlled Thrust Termination