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Air carrier medium large transport loss of cabin pressure mandates emergency declared descent and diversion to alternate airport.
| Attributes | |
| ACN | 231939 |
| Time | |
| Date | 199301 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : iso |
| State Reference | VA |
| Altitude | msl bound lower : 10000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc tower : ewr |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent other other other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : commercial |
| Experience | flight time last 90 days : 180 flight time total : 5500 flight time type : 1300 |
| ASRS Report | 231939 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 8600 flight time type : 1500 |
| ASRS Report | 232233 |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : declared emergency flight crew : overcame equipment problem other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
Level at FL350 cabin pressure exceeded 10000 ft triggering a level 2 alert (triple chime). We began an emergency descent and informed ZDC of our problem, declaring an emergency. Complied with EFIS checklist procedure for cabin pressurization to no avail. Neither automatic nor manual cabin pressurization had any effect. The cabin got up to approximately 15000 ft. The depressurization was slow, not a rapid decompression. Upon reaching 10000 ft, the cabin seemed to descend normally (at 400 FPM) with automatic system selected. Power levels had no effect on rate of cabin. Upon leaving 10000 ft for our divert to rdu, cabin pressurization fluctuated from minus 2000 FPM to plus 2000. Once again, neither manual or automatic had any effect. Diverted to rdu. Normal landing and approach. No emergency equipment requested.
Original NASA ASRS Text
Title: ACR MLG LOSS OF CABIN PRESSURE MANDATES EMER DECLARED DSCNT AND DIVERSION TO ALTERNATE ARPT.
Narrative: LEVEL AT FL350 CABIN PRESSURE EXCEEDED 10000 FT TRIGGERING A LEVEL 2 ALERT (TRIPLE CHIME). WE BEGAN AN EMER DSCNT AND INFORMED ZDC OF OUR PROB, DECLARING AN EMER. COMPLIED WITH EFIS CHKLIST PROC FOR CABIN PRESSURIZATION TO NO AVAIL. NEITHER AUTOMATIC NOR MANUAL CABIN PRESSURIZATION HAD ANY EFFECT. THE CABIN GOT UP TO APPROX 15000 FT. THE DEPRESSURIZATION WAS SLOW, NOT A RAPID DECOMPRESSION. UPON REACHING 10000 FT, THE CABIN SEEMED TO DSND NORMALLY (AT 400 FPM) WITH AUTO SYS SELECTED. PWR LEVELS HAD NO EFFECT ON RATE OF CABIN. UPON LEAVING 10000 FT FOR OUR DIVERT TO RDU, CABIN PRESSURIZATION FLUCTUATED FROM MINUS 2000 FPM TO PLUS 2000. ONCE AGAIN, NEITHER MANUAL OR AUTOMATIC HAD ANY EFFECT. DIVERTED TO RDU. NORMAL LNDG AND APCH. NO EMER EQUIP REQUESTED.
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.