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A B727 in climb at FL250 made an emergency descent due to steady loss of cabin pressure, cause unknown.
| Attributes | |
| ACN | 487608 |
| Time | |
| Date | 200010 |
| Day | Fri |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : enl.airport |
| State Reference | IL |
| Altitude | msl single value : 25000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | cruise : enroute altitude change |
| Route In Use | enroute airway : j8.airway |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : flight engineer pilot : cfi |
| Experience | flight time last 90 days : 20 flight time total : 7000 flight time type : 800 |
| ASRS Report | 487608 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : cabin attitude indicator other flight crewa other flight crewb other other : 3 |
| Resolutory Action | flight crew : overcame equipment problem |
| Consequence | other |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Company Aircraft Flight Crew Human Performance |
| Primary Problem | Aircraft |
Narrative:
We were dispatched at FL250 due to 1 pack inoperative due to deferral. Climbing through FL240, so informed the cabin altitude was at 9000 ft and climbing approximately 800 FPM. We decided that we would level off and see if the cabin stopped prior to 10000 ft. After a couple of mins, I asked where the cabin was. The so replied 'around 12000 ft.' we immediately went on oxygen. The cabin altitude warning horn never went off. We requested FL190 and began a descent. The cabin continued to climb so we requested 11000 ft and continued descent. The cabin came down, but on approach we went completely unpressurized. No emergency was declared.
Original NASA ASRS Text
Title: A B727 IN CLB AT FL250 MADE AN EMER DSCNT DUE TO STEADY LOSS OF CABIN PRESSURE, CAUSE UNKNOWN.
Narrative: WE WERE DISPATCHED AT FL250 DUE TO 1 PACK INOP DUE TO DEFERRAL. CLBING THROUGH FL240, SO INFORMED THE CABIN ALT WAS AT 9000 FT AND CLBING APPROX 800 FPM. WE DECIDED THAT WE WOULD LEVEL OFF AND SEE IF THE CABIN STOPPED PRIOR TO 10000 FT. AFTER A COUPLE OF MINS, I ASKED WHERE THE CABIN WAS. THE SO REPLIED 'AROUND 12000 FT.' WE IMMEDIATELY WENT ON OXYGEN. THE CABIN ALT WARNING HORN NEVER WENT OFF. WE REQUESTED FL190 AND BEGAN A DSCNT. THE CABIN CONTINUED TO CLB SO WE REQUESTED 11000 FT AND CONTINUED DSCNT. THE CABIN CAME DOWN, BUT ON APCH WE WENT COMPLETELY UNPRESSURIZED. NO EMER WAS DECLARED.
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.