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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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An MD80 flight crew experienced cabin depressurization at 34000 ft. They declared an emergency and descended to 10000 ft; where they regained control of packs and repressurized the cabin.
| Attributes | |
| ACN | 719616 |
| Time | |
| Date | 200612 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : hec.vortac |
| State Reference | CA |
| Altitude | msl single value : 34000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla.artcc tower : sbgr.tower |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| ASRS Report | 719616 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 719619 |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : cabin altitude indicator other flight crewa other flight crewb |
| Resolutory Action | flight crew : declared emergency other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
At FL340; .76 mach; I noticed that both pack temperature gauges were at maximum temperature. But temperature switches were in automatic (12 O'clock position); I adjusted the cabin temperature to a lower position. Shortly thereafter we got a master caution/pressurization flow light. We noticed that both pack flow gauges were at 0. We also noticed the cabin altitude was 9000 ft and climbing. We did the red box items. The cabin altitude did not stop climbing; we requested an emergency descent to 10000 ft. ZLA gave us clearance to 10000 ft. The captain executed the descent immediately. The cabin continued to climb to approximately 14000 ft. The captain leveled the aircraft at 10000 ft; we accomplished checklist items. Approximately 5 mins after leveling off the left pack came back on line; and restored cabin pressurization. We continued to bur. (Cabin masks deployed and the flight attendants handled the cabin issues.)
Original NASA ASRS Text
Title: AN MD80 FLT CREW EXPERIENCED CABIN DEPRESSURIZATION AT 34000 FT. THEY DECLARED AN EMER AND DSNDED TO 10000 FT; WHERE THEY REGAINED CTL OF PACKS AND REPRESSURIZED THE CABIN.
Narrative: AT FL340; .76 MACH; I NOTICED THAT BOTH PACK TEMP GAUGES WERE AT MAX TEMP. BUT TEMP SWITCHES WERE IN AUTO (12 O'CLOCK POS); I ADJUSTED THE CABIN TEMP TO A LOWER POS. SHORTLY THEREAFTER WE GOT A MASTER CAUTION/PRESSURIZATION FLOW LIGHT. WE NOTICED THAT BOTH PACK FLOW GAUGES WERE AT 0. WE ALSO NOTICED THE CABIN ALT WAS 9000 FT AND CLBING. WE DID THE RED BOX ITEMS. THE CABIN ALT DID NOT STOP CLBING; WE REQUESTED AN EMER DSCNT TO 10000 FT. ZLA GAVE US CLRNC TO 10000 FT. THE CAPT EXECUTED THE DSCNT IMMEDIATELY. THE CABIN CONTINUED TO CLB TO APPROX 14000 FT. THE CAPT LEVELED THE ACFT AT 10000 FT; WE ACCOMPLISHED CHKLIST ITEMS. APPROX 5 MINS AFTER LEVELING OFF THE L PACK CAME BACK ON LINE; AND RESTORED CABIN PRESSURIZATION. WE CONTINUED TO BUR. (CABIN MASKS DEPLOYED AND THE FLT ATTENDANTS HANDLED THE CABIN ISSUES.)
Data retrieved from NASA's ASRS site as of January 2009 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.