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An air carrier MD80 flight crew experience a loss of pressurization while they were using the anti-ice system. They made an emergency descent and recovered control of their pressurization at 14000 ft.
| Attributes | |
| ACN | 400880 |
| Time | |
| Date | 199804 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : lit |
| State Reference | AR |
| Altitude | msl bound lower : 28000 msl bound upper : 28000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zme tower : dfw |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Super 80 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 400880 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : declared emergency none taken : detected after the fact other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
At FL280 flow light illuminated with anti-ice on. We were in a rather thin layer of clouds at the time. We accomplished the rapid depressurization procedure which did not stop the cabin climbing. The cabin rate of climb needle was pegged full up. After the rapid departure procedure was accomplished it led us to the explosive depressurization procedure which we then accomplished. The cabin altitude was above 10000 ft for approximately 1 min. The flow situation corrected itself at approximately 14000 ft. We switched to automatic pressurization shortly thereafter and the aircraft cabin pressurized normally. We initially declared an emergency during the descent as the cabin was uncontrollable and the altitudes ATC were able to give us were not adequate. ZME, ZFW and dfw approach handled us in a most expedient manner. Please pass along our thanks to them. Also the cabin crew did a great job in making the required PA's and calming the passenger.
Original NASA ASRS Text
Title: AN ACR MD80 FLC EXPERIENCE A LOSS OF PRESSURIZATION WHILE THEY WERE USING THE ANTI-ICE SYS. THEY MADE AN EMER DSCNT AND RECOVERED CTL OF THEIR PRESSURIZATION AT 14000 FT.
Narrative: AT FL280 FLOW LIGHT ILLUMINATED WITH ANTI-ICE ON. WE WERE IN A RATHER THIN LAYER OF CLOUDS AT THE TIME. WE ACCOMPLISHED THE RAPID DEPRESSURIZATION PROC WHICH DID NOT STOP THE CABIN CLBING. THE CABIN RATE OF CLB NEEDLE WAS PEGGED FULL UP. AFTER THE RAPID DEP PROC WAS ACCOMPLISHED IT LED US TO THE EXPLOSIVE DEPRESSURIZATION PROC WHICH WE THEN ACCOMPLISHED. THE CABIN ALT WAS ABOVE 10000 FT FOR APPROX 1 MIN. THE FLOW SIT CORRECTED ITSELF AT APPROX 14000 FT. WE SWITCHED TO AUTOMATIC PRESSURIZATION SHORTLY THEREAFTER AND THE ACFT CABIN PRESSURIZED NORMALLY. WE INITIALLY DECLARED AN EMER DURING THE DSCNT AS THE CABIN WAS UNCONTROLLABLE AND THE ALTS ATC WERE ABLE TO GIVE US WERE NOT ADEQUATE. ZME, ZFW AND DFW APCH HANDLED US IN A MOST EXPEDIENT MANNER. PLEASE PASS ALONG OUR THANKS TO THEM. ALSO THE CABIN CREW DID A GREAT JOB IN MAKING THE REQUIRED PA'S AND CALMING THE PAX.
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.