|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||1201 To 1800|
|Locale Reference||atc facility : bfm|
|Altitude||msl bound lower : 13000|
msl bound upper : 33000
|Controlling Facilities||artcc : zjx|
|Operator||common carrier : air carrier|
|Make Model Name||Medium Large Transport, Low Wing, 2 Turbojet Eng|
|Flight Phase||cruise other|
|Affiliation||company : air carrier|
|Function||flight crew : captain|
oversight : pic
|Qualification||pilot : atp|
|Experience||flight time last 90 days : 270|
flight time total : 9000
|Function||flight crew : first officer|
|Qualification||pilot : commercial|
pilot : instrument
|Anomaly||aircraft equipment problem : critical|
|Independent Detector||aircraft equipment other aircraft equipment : unspecified|
other flight crewa
|Resolutory Action||aircraft : equipment problem dissipated|
controller : issued new clearance
|Air Traffic Incident||other|
Partial loss of cabin pressure, but enough to drop mask. Received clearance to descended to 13000' and regained control of press in manual. We were able climb back to FL270 and continue to fll. At fll we received mx. Cabin never went above 12000'. No complaints from passenger. Callback conversation with reporter revealed the following: maintenance found a bracket loose and tightened thinking that would solve the problem. Reporter found out later problem was in a water separator and possible icing on the outflow valve. Could not explain the oxygen masks coming out so early. Advised the aircraft had been operating in light icing conditions at the time of both failures. Second flight was primarily a ferry with no passenger on board.
Original NASA ASRS Text
Title: LOSS OF PRESSURIZATION RESULTED IN DESCENT TO LOWER ALT. REGAINED MANUAL CTL AND RETRUNED TO FL270.
Narrative: PARTIAL LOSS OF CABIN PRESSURE, BUT ENOUGH TO DROP MASK. RECEIVED CLRNC TO DESCENDED TO 13000' AND REGAINED CTL OF PRESS IN MANUAL. WE WERE ABLE CLB BACK TO FL270 AND CONTINUE TO FLL. AT FLL WE RECEIVED MX. CABIN NEVER WENT ABOVE 12000'. NO COMPLAINTS FROM PAX. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: MAINT FOUND A BRACKET LOOSE AND TIGHTENED THINKING THAT WOULD SOLVE THE PROB. RPTR FOUND OUT LATER PROB WAS IN A WATER SEPARATOR AND POSSIBLE ICING ON THE OUTFLOW VALVE. COULD NOT EXPLAIN THE OXYGEN MASKS COMING OUT SO EARLY. ADVISED THE ACFT HAD BEEN OPERATING IN LIGHT ICING CONDITIONS AT THE TIME OF BOTH FAILURES. SECOND FLT WAS PRIMARILY A FERRY WITH NO PAX ON BOARD.
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.