SNS3Guppy
In the GLEX, we have emergency pressurization just as in the LR. It would only come into play until both packs are inop, both channels on both pressurization controllers were inop and operation above 10,000 were absolutely necessary. From the testing, I understand cabin temp will stablize at around 85-90 degrees F at flight levels. Bearable, but uncomfortable.
GF