@ISV_Damocles They are stuck in a flight regime that isn't kind to modern PCB assembly. It can be done, but it requires a good bit of testing and specialized ruggedization techniques. The company I work for has developed boards with surface mount components that will work at over 150c and more than 25g worth of vibration. On the other hand, my lab is full of examples where we didn't get it right. Our industry can accept a certain level of failure - it is expensive, but not deadly. Boeing can't accept a 2% failure rate.