After being dispatched with one air conditioning pack deferred a crj-200 flight crew suffered the lo...

Narrative:

Upon arriving at the airplane in the morning; the flight attendant reported that the vents were blowing hot air. Unable to control the temperature in automatic or manual mode; we consulted with maintenance; who deferred the right pack and cabin temperature controller. For our departure; we followed the procedure outlined in the MEL book for operations with the left pack only. During climb; while passing through FL240; the captain and I noticed the cabin altitude suddenly rising rapidly and the delta P dropping; and we felt a severe pressure change in our ears. Our left pack had tripped offline. We immediately completed the emergency descent immediate action items and I began following the QRH procedures. We also declared an emergency and began a rapid descent to 10;000 ft. Upon reaching a safe altitude; I briefed the flight attendant and the captain explained the situation very briefly to the passengers. Very shortly into the event; we received an amber left pack hi temperature cas message. We completed the QRH for the emergency descent and then began working the left pack hi temperature QRH. During this QRH procedure upon recycling the pack; we noticed a burning smell; we immediately switched off the pack and picked up the speed to the airport. From this point on; a normal descent checklist; briefing; and normal landing occurred; and the fire trucks accompanied us to a normal deplane at the gate.

Original NASA ASRS Text

Title: After being dispatched with one air conditioning pack deferred a CRJ-200 flight crew suffered the loss of the remaining pack as they climbed through FL240.

Narrative: Upon arriving at the airplane in the morning; the Flight Attendant reported that the vents were blowing hot air. Unable to control the temperature in automatic or manual mode; we consulted with Maintenance; who deferred the right pack and cabin temperature controller. For our departure; we followed the procedure outlined in the MEL book for operations with the left pack only. During climb; while passing through FL240; the Captain and I noticed the cabin altitude suddenly rising rapidly and the delta P dropping; and we felt a severe pressure change in our ears. Our left pack had tripped offline. We immediately completed the Emergency Descent Immediate Action items and I began following the QRH procedures. We also declared an emergency and began a rapid descent to 10;000 FT. Upon reaching a safe altitude; I briefed the Flight Attendant and the Captain explained the situation very briefly to the passengers. Very shortly into the event; we received an amber L PACK HI TEMP CAS message. We completed the QRH for the emergency descent and then began working the L PACK HI TEMP QRH. During this QRH procedure upon recycling the pack; we noticed a burning smell; we immediately switched off the pack and picked up the speed to the airport. From this point on; a normal Descent Checklist; briefing; and normal landing occurred; and the fire trucks accompanied us to a normal deplane at the gate.

Data retrieved from NASA's ASRS site as of July 2013 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.

Attributes
ACN	1107174
Time
Date	201308
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Aircraft 1
Make Model Name	Regional Jet 200 ER/LR (CRJ200)
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Air Conditioning and Pressurization Pack
Person 1
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor

After being dispatched with one air conditioning pack deferred a crj-200 flight crew suffered the loss of the remaining pack as they climbed through FL240.