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Air carrier descended to lower altitude when the cabin pressure drop triggered the passenger masks drop for passenger use.
| Attributes | |
| ACN | 204295 |
| Time | |
| Date | 199203 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : mcw |
| State Reference | IA |
| Altitude | msl bound lower : 25000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zmp |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Route In Use | enroute airway : zmp |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 7300 flight time type : 1000 |
| ASRS Report | 204295 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 11000 |
| ASRS Report | 204379 |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa other other : unspecified |
| Resolutory Action | flight crew : exited adverse environment flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Loss of cabin pressure for unknown reason, passenger claimed oxygen masks not working. Masks were working normally. Oxygen pressure is needed to drop masks (which did happen). Cabin pressure only reached 12000 ft making need for oxygen slight from the regulator. Supplemental information from acn 204379. En route we had a slight cabin pressure loss due to unknown reasons. Passenger claimed no oxygen came out of masks. The pressure loss due to unknown reason was a slight one which only lasted about 5 mins with the cabin getting to 12000 ft for a very short time. Passenger's said they weren't getting oxygen.
Original NASA ASRS Text
Title: ACR DSNDED TO LOWER ALT WHEN THE CABIN PRESSURE DROP TRIGGERED THE PAX MASKS DROP FOR PAX USE.
Narrative: LOSS OF CABIN PRESSURE FOR UNKNOWN REASON, PAX CLAIMED OXYGEN MASKS NOT WORKING. MASKS WERE WORKING NORMALLY. OXYGEN PRESSURE IS NEEDED TO DROP MASKS (WHICH DID HAPPEN). CABIN PRESSURE ONLY REACHED 12000 FT MAKING NEED FOR OXYGEN SLIGHT FROM THE REGULATOR. SUPPLEMENTAL INFO FROM ACN 204379. ENRTE WE HAD A SLIGHT CABIN PRESSURE LOSS DUE TO UNKNOWN REASONS. PAX CLAIMED NO OXYGEN CAME OUT OF MASKS. THE PRESSURE LOSS DUE TO UNKNOWN REASON WAS A SLIGHT ONE WHICH ONLY LASTED ABOUT 5 MINS WITH THE CABIN GETTING TO 12000 FT FOR A VERY SHORT TIME. PAX'S SAID THEY WEREN'T GETTING OXYGEN.
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.