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Flight crew of large transport air carrier aircraft returned to land after not being able to maintain aircraft pressurization caused by a maintenance discrepancy.
| Attributes | |
| ACN | 245762 |
| Time | |
| Date | 199306 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : gdl |
| State Reference | FO |
| Altitude | msl bound lower : 13000 msl bound upper : 15000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : gdl |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude |
| 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 : 14000 flight time type : 2500 |
| ASRS Report | 245762 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : atp pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence other other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
It was brought to my attention that the station operations personnel sent an unauthorized mechanic to research a pressurization problem which I had brought to their attention. Assuming that air carrier airlines maintenance were in the discussion, it appears they were not advised. I had requested extra fuel and a flight plan for 25000 ft altitude, new release and dispatch with single pack operations according to the flight manual. I was advised that the r-pack valve was intermittent and at times stuck closed. We departed and had to return upon reaching 13000-15000 ft as the single pack would not prevent the cabin from climbing and all passenger masks deployed. No injuries and no problems upon landing at guadalajara, mexico.
Original NASA ASRS Text
Title: FLC OF LGT ACR ACFT RETURNED TO LAND AFTER NOT BEING ABLE TO MAINTAIN ACFT PRESSURIZATION CAUSED BY A MAINT DISCREPANCY.
Narrative: IT WAS BROUGHT TO MY ATTN THAT THE STATION OPS PERSONNEL SENT AN UNAUTH MECH TO RESEARCH A PRESSURIZATION PROB WHICH I HAD BROUGHT TO THEIR ATTN. ASSUMING THAT ACR AIRLINES MAINT WERE IN THE DISCUSSION, IT APPEARS THEY WERE NOT ADVISED. I HAD REQUESTED EXTRA FUEL AND A FLT PLAN FOR 25000 FT ALT, NEW RELEASE AND DISPATCH WITH SINGLE PACK OPS ACCORDING TO THE FLT MANUAL. I WAS ADVISED THAT THE R-PACK VALVE WAS INTERMITTENT AND AT TIMES STUCK CLOSED. WE DEPARTED AND HAD TO RETURN UPON REACHING 13000-15000 FT AS THE SINGLE PACK WOULD NOT PREVENT THE CABIN FROM CLBING AND ALL PAX MASKS DEPLOYED. NO INJURIES AND NO PROBS UPON LNDG AT GUADALAJARA, MEXICO.
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.