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FL350 cabin began a slow uncontrolled climb. SOP followed and requested lower altitude FL240 cabin rate increased and cleared continue descent to 10000 ft. 11000 ft regained control cabin and continued to dfw at 10000 ft. MD80, super 80.
| Attributes | |
| ACN | 340894 |
| Time | |
| Date | 199607 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : ama |
| State Reference | TX |
| Altitude | msl bound lower : 10000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zfw |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| 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 | 340894 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : critical inflight encounter : weather |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | aircraft : equipment problem dissipated controller : issued new clearance flight crew : declared emergency flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
Location, near turki intersection. Cruising at FL350, in clouds while circumnaving thunderstorms, the blue standby and transfer lockout lights illuminated, followed by the flow light and a 400-500 FPM cabin rate of climb. We went through the procedures, but were unable to stop the rate of climb. We asked for and received a lower altitude and started a descent. As we approached FL240 the cabin rate increased to 1000 FPM and we were cleared to 10000 ft. We donned our masks and, as we began to wake the passenger the pressurization returned to normal. Maximum cabin altitude reached was approximately 11000 ft followed by a return to a normal altitude for a cruise altitude of 10000 ft. We continued to dfw without further problem. Other things the first officer and I noticed were that the left pack failed toward the end of the descent (which was reinstated) and that the flight attendants reported that the cabin became quite warm during all or most of the problem until the system came back to normal. Ahh all nighters!
Original NASA ASRS Text
Title: FL350 CABIN BEGAN A SLOW UNCTLED CLB. SOP FOLLOWED AND REQUESTED LOWER ALT FL240 CABIN RATE INCREASED AND CLRED CONTINUE DSCNT TO 10000 FT. 11000 FT REGAINED CTL CABIN AND CONTINUED TO DFW AT 10000 FT. MD80, SUPER 80.
Narrative: LOCATION, NEAR TURKI INTXN. CRUISING AT FL350, IN CLOUDS WHILE CIRCUMNAVING TSTMS, THE BLUE STANDBY AND TRANSFER LOCKOUT LIGHTS ILLUMINATED, FOLLOWED BY THE FLOW LIGHT AND A 400-500 FPM CABIN RATE OF CLB. WE WENT THROUGH THE PROCS, BUT WERE UNABLE TO STOP THE RATE OF CLB. WE ASKED FOR AND RECEIVED A LOWER ALT AND STARTED A DSCNT. AS WE APCHED FL240 THE CABIN RATE INCREASED TO 1000 FPM AND WE WERE CLRED TO 10000 FT. WE DONNED OUR MASKS AND, AS WE BEGAN TO WAKE THE PAX THE PRESSURIZATION RETURNED TO NORMAL. MAX CABIN ALT REACHED WAS APPROX 11000 FT FOLLOWED BY A RETURN TO A NORMAL ALT FOR A CRUISE ALT OF 10000 FT. WE CONTINUED TO DFW WITHOUT FURTHER PROB. OTHER THINGS THE FO AND I NOTICED WERE THAT THE L PACK FAILED TOWARD THE END OF THE DSCNT (WHICH WAS REINSTATED) AND THAT THE FLT ATTENDANTS RPTED THAT THE CABIN BECAME QUITE WARM DURING ALL OR MOST OF THE PROB UNTIL THE SYS CAME BACK TO NORMAL. AHH ALL NIGHTERS!
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.