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In cruise flight crew experiences a rapid depressurization, declares an emergency and conforms with established procedures.
| Attributes | |
| ACN | 320805 |
| Time | |
| Date | 199511 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : pmd |
| State Reference | CA |
| Altitude | msl bound lower : 14000 msl bound upper : 41000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa |
| Operator | general aviation : corporate |
| Make Model Name | Learjet 35 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 135 flight time total : 18459 flight time type : 10000 |
| ASRS Report | 320805 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 75 flight time total : 3000 flight time type : 1000 |
| ASRS Report | 320932 |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : declared emergency other other |
| Consequence | other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
En route from sfo to psp and level at FL410, heard a loud hissing (air escaping) sound followed by an even louder wind noise that seemed to be coming from the entry door. Almost immediately the cabin climb indicator showed a rapid climb (5000 or 6000 FPM) and the pressurization system automatically went into emergency mode. The crew donned our oxygen masks and we initiated an emergency descent. Dialed in 7700 on transponder and advised ATC of our situation and descent profile. We leveled at 14000 ft and continued on to psp with no further incidents. Maintenance discovered a bad lower door seal and replaced it. Callback conversation with reporter revealed the following information: the reporter stated he was flying a lear 35. He said it was no big deal. The sky conditions were clear and though it was a rapid depressurization it was not explosive.
Original NASA ASRS Text
Title: IN CRUISE FLC EXPERIENCES A RAPID DEPRESSURIZATION, DECLARES AN EMER AND CONFORMS WITH ESTABLISHED PROCS.
Narrative: ENRTE FROM SFO TO PSP AND LEVEL AT FL410, HEARD A LOUD HISSING (AIR ESCAPING) SOUND FOLLOWED BY AN EVEN LOUDER WIND NOISE THAT SEEMED TO BE COMING FROM THE ENTRY DOOR. ALMOST IMMEDIATELY THE CABIN CLB INDICATOR SHOWED A RAPID CLB (5000 OR 6000 FPM) AND THE PRESSURIZATION SYS AUTOMATICALLY WENT INTO EMER MODE. THE CREW DONNED OUR OXYGEN MASKS AND WE INITIATED AN EMER DSCNT. DIALED IN 7700 ON XPONDER AND ADVISED ATC OF OUR SIT AND DSCNT PROFILE. WE LEVELED AT 14000 FT AND CONTINUED ON TO PSP WITH NO FURTHER INCIDENTS. MAINT DISCOVERED A BAD LOWER DOOR SEAL AND REPLACED IT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED HE WAS FLYING A LEAR 35. HE SAID IT WAS NO BIG DEAL. THE SKY CONDITIONS WERE CLR AND THOUGH IT WAS A RAPID DEPRESSURIZATION IT WAS NOT EXPLOSIVE.
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.