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A B727-200 in cruise at FL250 was unable to maintain cabin pressure on single pack operation activated a deferred as inoperative pack to maintain altitude.
| Attributes | |
| ACN | 496890 |
| Time | |
| Date | 200101 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : slc.airport |
| State Reference | UT |
| Altitude | msl single value : 25000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zlc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B727-200 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | cruise : level |
| Route In Use | enroute airway : j173.airway |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 496890 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : multi engine |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : cabin altitude indicator other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem |
| Consequence | other other |
| Supplementary | |
| Problem Areas | Environmental Factor Flight Crew Human Performance Aircraft |
| Primary Problem | Aircraft |
Narrative:
Unable to control cabin altitude during climb out and leveloff at FL250. Tried all modes of electronic pressurization system with no help. Elected to reinstate the placarded left pack to avoid oxygen mask deployment in passenger cabin. Could not descend below 10000 ft due to high terrain. Reinstating the left pack regained control of the cabin.
Original NASA ASRS Text
Title: A B727-200 IN CRUISE AT FL250 WAS UNABLE TO MAINTAIN CABIN PRESSURE ON SINGLE PACK OP ACTIVATED A DEFERRED AS INOP PACK TO MAINTAIN ALT.
Narrative: UNABLE TO CTL CABIN ALT DURING CLBOUT AND LEVELOFF AT FL250. TRIED ALL MODES OF ELECTRONIC PRESSURIZATION SYS WITH NO HELP. ELECTED TO REINSTATE THE PLACARDED L PACK TO AVOID OXYGEN MASK DEPLOYMENT IN PAX CABIN. COULD NOT DSND BELOW 10000 FT DUE TO HIGH TERRAIN. REINSTATING THE L PACK REGAINED CTL OF THE CABIN.
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.