# Trajectory impact in case of STS hold down studs failure

The comment on this question made me think, suppose all holding studs mounted on SRB’s do get failed, how much impact would it really result in trajectory, considering same fuel burn time of SRB’s.

Considering acceleration of $$10~m/s^2$$ at launch. To calculate the $$\delta V$$ lost at launch pad.

$$\delta V = 10 \times \delta t$$ where $$\delta t$$ is time taken by SRB’s to break the stud.

I think $$\delta t$$ can be around 1 second, though I cannot find source to get correct number. If that assumption is correct

$$\delta V = 10~m/s$$ therefore,

Considering total time to orbit as $$500~s$$ $$\delta S = 10 \times 500 = 5~km$$

Is this a severe trajectory impact? What kind of margins can STS tolerate on trajectory or underperformance and still operate?

• Don't forget the extra 3000 lbs of liquid propellant that the SSMEs burned up sitting on the pad for that extra 1 second. – Organic Marble Feb 9 at 15:49