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Flight crew of a DC9 has uncontrolled cabin pressure climb indication at cruise altitude of FL350. Emergency descent begun to descend at FL200 with control at 14000 ft.
| Attributes | |
| ACN | 416143 |
| Time | |
| Date | 199810 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : abi |
| State Reference | TX |
| Altitude | msl bound lower : 14000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zfw |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other descent other other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 16000 flight time type : 4500 |
| ASRS Report | 416143 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : declared emergency other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
At FL350 with wing and engine anti-ice on, red cabin light came on and cabin continued to climb at 1500 FPM. By 11500 ft cabin with pressure controller locked full closed. We declared an emergency and began an emergency descent, simultaneously declared an emergency and donned oxygen masks. We used all applicable checklists and descended to 14000 ft. About FL200, cabin began to descend and by 14000 ft we were able to control cabin normally. Descended into okc and landed. Problem was a leak in the pressure duct (air conditioning) due to a loose ring clamp.
Original NASA ASRS Text
Title: FLC OF A DC9 HAS UNCTLED CABIN PRESSURE CLB INDICATION AT CRUISE ALT OF FL350. EMER DSCNT BEGUN TO DSND AT FL200 WITH CTL AT 14000 FT.
Narrative: AT FL350 WITH WING AND ENG ANTI-ICE ON, RED CABIN LIGHT CAME ON AND CABIN CONTINUED TO CLB AT 1500 FPM. BY 11500 FT CABIN WITH PRESSURE CTLR LOCKED FULL CLOSED. WE DECLARED AN EMER AND BEGAN AN EMER DSCNT, SIMULTANEOUSLY DECLARED AN EMER AND DONNED OXYGEN MASKS. WE USED ALL APPLICABLE CHKLISTS AND DSNDED TO 14000 FT. ABOUT FL200, CABIN BEGAN TO DSND AND BY 14000 FT WE WERE ABLE TO CTL CABIN NORMALLY. DSNDED INTO OKC AND LANDED. PROB WAS A LEAK IN THE PRESSURE DUCT (AIR CONDITIONING) DUE TO A LOOSE RING CLAMP.
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.