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While in cruise at FL320 the flight crew of a citation 550 suffered a rapid loss of pressurization. They declared an emergency and conducted an emergency descent to 10;000 MSL where they regained some pressurization control and; ultimately diverted to the location of their corporate maintenance facility. There they discovered the pressurization outflow valve had failed in the full open position.
| Attributes | |
| ACN | 1018591 |
| Time | |
| Date | 201206 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Citation II S2/Bravo (C550) |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Cruise |
| Route In Use | Direct |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Pressurization Outflow Valve |
| Person 1 | |
| Function | Pilot Not Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 20 Flight Crew Total 6000 Flight Crew Type 3000 |
| Person 2 | |
| Function | First Officer Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Instructor Flight Crew Instrument Flight Crew Multiengine |
| Experience | Flight Crew Last 90 Days 100 Flight Crew Total 8300 Flight Crew Type 1000 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
While [we were] in cruise at FL320; we heard a bang followed by rapid rise at 6;000+ FPM rate of climb in the cabin altitude. We initiated an emergency descent to 10;000 where we regained some control of the pressurization and continued to our maintenance facility. Maintenance determined the problem to be a failed outflow valve.
Original NASA ASRS Text
Title: While in cruise at FL320 the flight crew of a Citation 550 suffered a rapid loss of pressurization. They declared an emergency and conducted an emergency descent to 10;000 MSL where they regained some pressurization control and; ultimately diverted to the location of their corporate maintenance facility. There they discovered the pressurization outflow valve had failed in the full open position.
Narrative: While [we were] in cruise at FL320; we heard a bang followed by rapid rise at 6;000+ FPM rate of climb in the cabin altitude. We initiated an emergency descent to 10;000 where we regained some control of the pressurization and continued to our maintenance facility. Maintenance determined the problem to be a failed outflow valve.
Data retrieved from NASA's ASRS site as of July 2013 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.