|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||1201 To 1800|
|Locale Reference||airport : den|
|Altitude||msl bound lower : 15000|
msl bound upper : 16000
|Operator||common carrier : air carrier|
|Make Model Name||Medium Large Transport, Low Wing, 2 Turbojet Eng|
|Flight Phase||climbout : intermediate altitude|
|Route In Use||enroute airway : zdc|
|Affiliation||company : air carrier|
|Function||flight crew : captain|
oversight : pic
|Qualification||pilot : atp|
|Experience||flight time total : 26000|
|Function||flight crew : first officer|
|Qualification||pilot : commercial|
pilot : instrument
|Anomaly||aircraft equipment problem : less severe|
other anomaly other
|Independent Detector||other flight crewa|
|Resolutory Action||flight crew : overcame equipment problem|
|Air Traffic Incident||other|
Passing approximately 14000' call from F/a. First officer answered. I said, 'it's too hot for them.' while first officer picked up phone I noticed cabin pressure was pegged up and hit manual lever and told him get pressure and leveled off and got clearance for 15000'. He got pressure back, but O2 masks had fallen. Returned to den. I don't think we did anything wrong in this case except the pressurization worked ok in automatic after we tried it later. Also, we were slow to recognize the cabin going up (maybe). The aircraft had 4 placards, 1 was for cabin altitude warning (red) light (light had been written up as coming on intermittently). Horn and light supposed to come on at 10000'--neither did. I'm not sure when we started losing pressure, but the master warning, if we had gotten it, would have given us time to stop it from going through 14000'. Also, should we have noticed the pressure change (ears, etc) sooner?
Original NASA ASRS Text
Title: ACR MLG PRESSURIZATION PROBLEM RETURN AND LAND.
Narrative: PASSING APPROX 14000' CALL FROM F/A. F/O ANSWERED. I SAID, 'IT'S TOO HOT FOR THEM.' WHILE F/O PICKED UP PHONE I NOTICED CABIN PRESSURE WAS PEGGED UP AND HIT MANUAL LEVER AND TOLD HIM GET PRESSURE AND LEVELED OFF AND GOT CLRNC FOR 15000'. HE GOT PRESSURE BACK, BUT O2 MASKS HAD FALLEN. RETURNED TO DEN. I DON'T THINK WE DID ANYTHING WRONG IN THIS CASE EXCEPT THE PRESSURIZATION WORKED OK IN AUTO AFTER WE TRIED IT LATER. ALSO, WE WERE SLOW TO RECOGNIZE THE CABIN GOING UP (MAYBE). THE ACFT HAD 4 PLACARDS, 1 WAS FOR CABIN ALT WARNING (RED) LIGHT (LIGHT HAD BEEN WRITTEN UP AS COMING ON INTERMITTENTLY). HORN AND LIGHT SUPPOSED TO COME ON AT 10000'--NEITHER DID. I'M NOT SURE WHEN WE STARTED LOSING PRESSURE, BUT THE MASTER WARNING, IF WE HAD GOTTEN IT, WOULD HAVE GIVEN US TIME TO STOP IT FROM GOING THROUGH 14000'. ALSO, SHOULD WE HAVE NOTICED THE PRESSURE CHANGE (EARS, ETC) SOONER?
Data retrieved from NASA's ASRS site as of August 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.