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CRJ200 crew made an emergency descent after the cabin altitude was rising rapidly. The crew was dispatched with 1 pack MEL'ed inoperative.
| Attributes | |
| ACN | 638287 |
| Time | |
| Date | 200411 |
| Day | Sat |
| Local Time Of Day | 200411 |
| Place | |
| Locale Reference | atc facility : zmp.artcc |
| State Reference | MN |
| Altitude | msl single value : 25000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zmp.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Regional Jet 200 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 250 flight time total : 11000 flight time type : 6000 |
| ASRS Report | 638287 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : eicas cool message cabin alt message other flight crewa other flight crewb |
| Resolutory Action | flight crew : landed as precaution other |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : repair |
| Supplementary | |
| Problem Areas | Aircraft Company |
| Primary Problem | Aircraft |
Narrative:
Right pack was deferred when our flight left msp. Aircraft was deiced at msp and departed normally. During climb through FL180, the flight crew heard a low rumbling noise. All system pages were scanned, but the source could not be located. Display cool message illuminated. Before the captain could reach for the QRH, the cabin altitude message illuminated and cabin altitude was seen to be rising rapidly. Captain and the first officer donned their oxygen masks and performed memory items for an emergency descent. Captain notified ATC that an immediate descent to 10000 ft was necessary. Flight was cleared down to 11000 ft and then shortly after to 10000 ft. Crew came off oxygen masks (cabin masks did not automatic-deploy). Crew performed QRH procedures for display 'cool' and 'cabin altitude' messages. Captain notified flight attendant and ATC. An emergency was not declared. Both messages cleared after QRH was complete and captain attempted to notify dispatch, but was unable. Plane was climbed to 15000 ft but once contact was established with dispatch and maintenance control, cabin altitude again began to rise. Plane was again descended to 10000 ft and dispatch and maintenance control were advised. Dispatch computed new numbers to proceed to cvg. All agreed that the flight could safely continue to cvg and the flight proceeded uneventfully. When the aircraft parked at the gate, the fuel on board was 2200 pounds. Maintenance met the plane at the gate.
Original NASA ASRS Text
Title: CRJ200 CREW MADE AN EMER DSCNT AFTER THE CABIN ALT WAS RISING RAPIDLY. THE CREW WAS DISPATCHED WITH 1 PACK MEL'ED INOP.
Narrative: R PACK WAS DEFERRED WHEN OUR FLT LEFT MSP. ACFT WAS DEICED AT MSP AND DEPARTED NORMALLY. DURING CLB THROUGH FL180, THE FLT CREW HEARD A LOW RUMBLING NOISE. ALL SYS PAGES WERE SCANNED, BUT THE SOURCE COULD NOT BE LOCATED. DISPLAY COOL MESSAGE ILLUMINATED. BEFORE THE CAPT COULD REACH FOR THE QRH, THE CABIN ALT MESSAGE ILLUMINATED AND CABIN ALT WAS SEEN TO BE RISING RAPIDLY. CAPT AND THE FO DONNED THEIR OXYGEN MASKS AND PERFORMED MEMORY ITEMS FOR AN EMER DSCNT. CAPT NOTIFIED ATC THAT AN IMMEDIATE DSCNT TO 10000 FT WAS NECESSARY. FLT WAS CLRED DOWN TO 11000 FT AND THEN SHORTLY AFTER TO 10000 FT. CREW CAME OFF OXYGEN MASKS (CABIN MASKS DID NOT AUTO-DEPLOY). CREW PERFORMED QRH PROCS FOR DISPLAY 'COOL' AND 'CABIN ALT' MESSAGES. CAPT NOTIFIED FLT ATTENDANT AND ATC. AN EMER WAS NOT DECLARED. BOTH MESSAGES CLRED AFTER QRH WAS COMPLETE AND CAPT ATTEMPTED TO NOTIFY DISPATCH, BUT WAS UNABLE. PLANE WAS CLBED TO 15000 FT BUT ONCE CONTACT WAS ESTABLISHED WITH DISPATCH AND MAINT CTL, CABIN ALT AGAIN BEGAN TO RISE. PLANE WAS AGAIN DSNDED TO 10000 FT AND DISPATCH AND MAINT CTL WERE ADVISED. DISPATCH COMPUTED NEW NUMBERS TO PROCEED TO CVG. ALL AGREED THAT THE FLT COULD SAFELY CONTINUE TO CVG AND THE FLT PROCEEDED UNEVENTFULLY. WHEN THE ACFT PARKED AT THE GATE, THE FUEL ON BOARD WAS 2200 LBS. MAINT MET THE PLANE AT THE GATE.
Data retrieved from NASA's ASRS site as of July 2007 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.