Choose one aircraft CABIN ENVIRONMENTAL CONTROL system from an aircraft of your choosing, and describe it briefly in your primary post.

AEROSPACE
For the 8.4 discussions choose one aircraft CABIN ENVIRONMENTAL CONTROL system from an aircraft of your choosing, and describe it briefly in your primary post. Tell us the name of the system, specific aircraft it is used in, a few main components of the system and basically how it works or the purpose, and then what the negative results are if it fails in flight.