Transport flight crew reported a failure of the pressurization system; which necessitated an immedia...

Attributes
ACN	1577269
Time
Date	201809
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Make Model Name	Light Transport Low Wing 2 Turbojet Eng
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Pressurization Control System
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Person 2
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

While in cruise flight at FL340; we got an air cond fail caution light and heard the emergency system come on in the cabin. Immediately following this indication we noted a change in cabin altitude with a sustained cabin climb of approximately 2;000 FPM. This was followed by the cabin low pres warning indicator within a few minutes.we donned O2 masks and asked ATC to for a descent due to a cabin pressurization issue. In the descent we ran the checklist for both cabin pres low and air cond fail. While in the decent ATC asked if we wanted to [advise] for the descent; we replied yes. At 10;000 feet.; we advised we would divert and [situation] was over.

Original NASA ASRS Text

Title: Transport flight crew reported a failure of the pressurization system; which necessitated an immediate descent and a diversion to a nearby airport.

Narrative: While in cruise flight at FL340; we got an AIR COND FAIL caution light and heard the EMER system come on in the cabin. Immediately following this indication we noted a change in cabin altitude with a sustained cabin climb of approximately 2;000 FPM. This was followed by the CABIN LOW PRES warning indicator within a few minutes.We donned O2 masks and asked ATC to for a descent due to a cabin pressurization issue. In the descent we ran the checklist for both cabin PRES LOW and AIR COND FAIL. While in the decent ATC asked if we wanted to [advise] for the descent; we replied yes. At 10;000 feet.; we advised we would divert and [situation] was over.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.