Ship Breakdown While At Near Jump Velocity

I'm putting together a scenario where a tramp freighter is making it's rounds through the Frontier. It is on it's way from Fromeltar to Theseus with stops in Prenglar and Timeon.  The ship does not need to stop in Dramune, Cassidine, or new Streel.  Typically I have seen this as the ship jumps to the system then while at near jump velocity changes it's vector and calculates the jump to the new star.    By KH rules the capability to jump is governed by the engines.  Atomics need overhauls, ion drives do not.  The stop at Prenglar is for atomic engine overhaul. I want the ship to breakdown when it reaches Cassidine due to typical marginal maintenance of a tramp freighter.  This breakdown needs to involve calling for a tow.  But, if the ship just entered the system from a jump it is traveling at near jump velocity.  So my question is what should the ship breakdown be?<br /><br />Second related question is if I switch to ion engines so that the overhaul at Prenglar doesn't need to be part of the plan, what should the breakdown in Cassidine be?