NASA noting they are 1% over the allowable Ignition Overpresssure of the SRBs on SLS even with the Sound Suppresion System. Issue is with Orion. They expect a waiver for Artemis 1. That overpressure is an issue. It nearly crippled Columbia on STS-1. 1/2 #NAC #HEO

— Chris G - NSF (@ChrisG_NSF) October 30, 2019