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A B737-500 in climb at 5000 ft diverted due to unable to pressurize the cabin. Cabin pressure was uncontrollable in automatic, manual, or standby system.
| Attributes | |
| ACN | 605756 |
| Time | |
| Date | 200401 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | msl single value : 5000 |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Controlling Facilities | tracon : zzz.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737-500 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure sid : zzz |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 120 flight time total : 3624 flight time type : 1277 |
| ASRS Report | 605756 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial pilot : multi engine |
| Experience | flight time last 90 days : 225 flight time total : 4100 flight time type : 225 |
| ASRS Report | 605762 |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : master caution light other flight crewa other flight crewb |
| Resolutory Action | controller : issued new clearance flight crew : diverted to another airport flight crew : landed as precaution |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
On the departure, after intercepting heading, ATC cleared us to 15000 ft. We were climbing out at approximately 4000-5000 FPM. We had a master caution with automatic fail light and the pressurization went to standby. The first officer noticed the rate of climb of the cabin was equal to the aircraft's ivsi. We continued on the departure. On the turn, we informed approach controller we had a pressurization problem and had to level at 10000 ft. The first officer ran the checklist and we determined that the cabin was uncontrollable. Since we did not have the fuel to troubleshoot and continue to destination, I made the decision to return to ZZZ. The first officer informed ATC. I called ramp to have them inform dispatch and maintenance of our return. Ramp said they would comply. We returned to ZZZ with a normal approach and landing. I did not declare an emergency.
Original NASA ASRS Text
Title: A B737-500 IN CLB AT 5000 FT DIVERTED DUE TO UNABLE TO PRESSURIZE THE CABIN. CABIN PRESSURE WAS UNCTLABLE IN AUTO, MANUAL, OR STANDBY SYS.
Narrative: ON THE DEP, AFTER INTERCEPTING HDG, ATC CLRED US TO 15000 FT. WE WERE CLBING OUT AT APPROX 4000-5000 FPM. WE HAD A MASTER CAUTION WITH AUTO FAIL LIGHT AND THE PRESSURIZATION WENT TO STANDBY. THE FO NOTICED THE RATE OF CLB OF THE CABIN WAS EQUAL TO THE ACFT'S IVSI. WE CONTINUED ON THE DEP. ON THE TURN, WE INFORMED APCH CTLR WE HAD A PRESSURIZATION PROB AND HAD TO LEVEL AT 10000 FT. THE FO RAN THE CHKLIST AND WE DETERMINED THAT THE CABIN WAS UNCTLABLE. SINCE WE DID NOT HAVE THE FUEL TO TROUBLESHOOT AND CONTINUE TO DEST, I MADE THE DECISION TO RETURN TO ZZZ. THE FO INFORMED ATC. I CALLED RAMP TO HAVE THEM INFORM DISPATCH AND MAINT OF OUR RETURN. RAMP SAID THEY WOULD COMPLY. WE RETURNED TO ZZZ WITH A NORMAL APCH AND LNDG. I DID NOT DECLARE AN EMER.
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.