PC-24
Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Aircraft Equipment Problem Critical
General None Reported / Taken
Aircraft
Flight was Part 135 flight with three passengers from ZZZ to ZZZ1. Flight was normal from start through cruise portion. Upon descending for our destination through 36;000 ft.; the 'L/R Bleed OFF/Fail' Caution Advisory System (CAS) illuminated. We moved the thrust levers from the idle position forward; thinking we were just not getting enough bleed air. However; after bringing them forward; the cabin altitude still continued to climb. At this point the cabin altitude went above 10;000 ft. and the associated CAS illuminated. The aircraft's Emergency Descent Mode also automatically engaged at the same time. The crew told ATC we had pressurization issues and needed to get down. Oxygen masks were then donned and communication was reestablished. We were initially given an altitude of 17;000 ft. When we leveled off; the cabin started to pressurize again. From this point on the cabin pressurization system worked normally. At no time did the cabin altitude exceed 12;000 ft.; nor did the passengers oxygen masks deploy. No emergency was declared and the flight continued uneventfully to the planned destination.
PC-24 Pilot Not Flying reported an equipment failure resulting in a loss of cabin pressure.