Narrative:

While on arrival in range into the airport; my first officer (first officer) and I received a left bleed air duct master warning message. My first officer had the radios and controls as I attempted to reference the QRH (we already had a right pack inoperative and MEL'd). I noticed that we started to lose cabin pressure at a high rate at which time I instructed my first officer to perform a rapid descent and to advise ATC [of the situation]. I then took the controls once I had seen these actions were not happening in a timely manner and performed a rapid descent.I then advised ATC of the emergency descent and they cleared us to 10;000ft. Once on a stable and rapid descent; I gave the controls and radios back to my first officer and finished working the QRH. Once the QRH was completed I then advised the flight attendants and company. At this time we had already been cleared direct to the airport with less than 10 minutes of flight time left I then completed the in range items and was given clearance to land.we then performed a normal landing using normal procedures. Passengers where not harmed per the flight attendants and no medical attention was needed. We taxied to the gate and the passengers deplaned without incident. The assistant chief pilot was notified along with dispatch and maintenance control who advised me this same scenario happened one week prior.

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Original NASA ASRS Text

Title: Aircrew experienced depressurization due to right pack MEL'd inoperative and an inflight left bleed air source failure. Flight executed emergency descent and landed.

Narrative: While on arrival in range into the airport; my First Officer (FO) and I received a L Bleed Air Duct master warning message. My FO had the radios and controls as I attempted to reference the QRH (we already had a right pack inoperative and MEL'd). I noticed that we started to lose cabin pressure at a high rate at which time I instructed my FO to perform a rapid descent and to advise ATC [of the situation]. I then took the controls once I had seen these actions were not happening in a timely manner and performed a rapid descent.I then advised ATC of the emergency descent and they cleared us to 10;000ft. Once on a stable and rapid descent; I gave the controls and radios back to my FO and finished working the QRH. Once the QRH was completed I then advised the Flight Attendants and company. At this time we had already been cleared direct to the airport with less than 10 minutes of flight time left I then completed the in range items and was given clearance to land.We then performed a normal landing using normal procedures. Passengers where not harmed per the Flight attendants and no medical attention was needed. We taxied to the gate and the passengers deplaned without incident. The Assistant Chief pilot was notified along with dispatch and Maintenance Control who advised me this same scenario happened one week prior.

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.