Yes, let’s keep using them:
In this case, the DM series motors passed all of ATK’s and NASA’s inspections and test firings. It wasn’t until ATK was proceeding toward QM series motor segments that NASA requested more thorough inspections of the QM series motors to determine whether the switch to non-asbestos containing insulation liners was having a previously unseen effect.
“The beauty of the solid rocket motor inspection system is that defects will be found and solutions reached to ensure the motors delivered will perform with the highest reliability,” said Reed. “This is a requirement to ensure SLS is a safe and reliable system for human exploration of deep space.”
Yeah. Right.
[Update a few minutes later]
So we have giant SRBs with persistent unpredictable dangerous defects+massive political pressure to get to launch. What could go wrong? #SLS
— Trampoline Rocket (@TrampolinRocket) September 15, 2014