|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||1201 To 1800|
|Locale Reference||atc facility : bna|
|Altitude||msl bound lower : 10000|
msl bound upper : 35000
|Controlling Facilities||artcc : zme|
|Operator||common carrier : air carrier|
|Make Model Name||Medium Large Transport, Low Wing, 2 Turbojet Eng|
|Flight Phase||cruise other|
|Route In Use||enroute : on vectors|
|Affiliation||company : air carrier|
|Function||flight crew : first officer|
|Qualification||pilot : commercial|
pilot : flight engineer
pilot : instrument
pilot : atp
pilot : cfi
|Experience||flight time last 90 days : 140|
flight time total : 10000
|Function||flight crew : captain|
oversight : pic
|Qualification||pilot : atp|
|Anomaly||aircraft equipment problem : critical|
|Independent Detector||aircraft equipment other aircraft equipment : unspecified|
other flight crewa
|Resolutory Action||flight crew : declared emergency|
On flight pit to dfw at FL350 I noticed we were getting into icing conditions. Looking up to see if it was on I noticed the caution light on the pressurization system. I brought it to the captain's attention and started working on the abnormal checklist. We could not arrest the pressurization before 10000 ft cabin altitude then moved on to the explosive depressurization procedure and the emergency descent procedure. Set 7700 in the transponder and got clearance to 10000 with a turn to nashville. In nashville, the WX was VFR. Landing safely with emergency equipment standing by. No passenger injured. The system of checklists and help with ATC worked very well. Probable cause was failure of the air conditioning system.
Original NASA ASRS Text
Title: MLG AT CRUISE HAS CAUTION LIGHT ON THE PRESSURIZATION SYS ACTIVATE.
Narrative: ON FLT PIT TO DFW AT FL350 I NOTICED WE WERE GETTING INTO ICING CONDITIONS. LOOKING UP TO SEE IF IT WAS ON I NOTICED THE CAUTION LIGHT ON THE PRESSURIZATION SYS. I BROUGHT IT TO THE CAPT'S ATTN AND STARTED WORKING ON THE ABNORMAL CHKLIST. WE COULD NOT ARREST THE PRESSURIZATION BEFORE 10000 FT CABIN ALT THEN MOVED ON TO THE EXPLOSIVE DEPRESSURIZATION PROC AND THE EMER DSCNT PROC. SET 7700 IN THE XPONDER AND GOT CLRNC TO 10000 WITH A TURN TO NASHVILLE. IN NASHVILLE, THE WX WAS VFR. LNDG SAFELY WITH EMER EQUIP STANDING BY. NO PAX INJURED. THE SYS OF CHKLISTS AND HELP WITH ATC WORKED VERY WELL. PROBABLE CAUSE WAS FAILURE OF THE AIR CONDITIONING SYS.
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.