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A LJ45 made an emergency descent from FL430 following the loss of pressurization. They responded to a TCAS RA during the descent.
| Attributes | |
| ACN | 907982 |
| Time | |
| Date | 201009 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Learjet 45 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Cruise |
| Route In Use | Direct |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Pressurization System |
| Person 1 | |
| Function | Captain |
| Qualification | Flight Crew Multiengine Flight Crew Instrument Flight Crew Flight Instructor Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 75 Flight Crew Total 11000 Flight Crew Type 4 |
| Events | |
| Anomaly | ATC Issue All Types Aircraft Equipment Problem Critical Conflict Airborne Conflict Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance |
| Miss Distance | Horizontal 1000 Vertical 1000 |
Narrative:
At cruise altitude of FL430 we lost control of the cabin pressurization. We went on oxygen and initiated an emergency descent. We notified ATC and they gave us a 240 heading which was left of course. Center asked us to stop the descent at different altitudes but we notified them we were unable as the cabin altitude was above 10;000 and climbing. The 240 heading had us pointed right at traffic on the TCAS. It became a TA then an RA. The RA was to not descend. I leveled off and told ATC that we were responding to a resolution advisory. The TCAS showed they passed directly beneath us at 1;000 ft. I do not remember the altitude but it was around 30;000 ft MSL. We continued our descent to 10;000 and diverted to our home base. I am not sure at this point why we lost pressurization. I am not sure what we could have done different on the descent or the TCAS RA.
Original NASA ASRS Text
Title: A LJ45 made an emergency descent from FL430 following the loss of pressurization. They responded to a TCAS RA during the descent.
Narrative: At cruise altitude of FL430 we lost control of the cabin pressurization. We went on oxygen and initiated an emergency descent. We notified ATC and they gave us a 240 heading which was left of course. Center asked us to stop the descent at different altitudes but we notified them we were unable as the cabin altitude was above 10;000 and climbing. The 240 heading had us pointed right at traffic on the TCAS. It became a TA then an RA. The RA was to not descend. I leveled off and told ATC that we were responding to a Resolution Advisory. The TCAS showed they passed directly beneath us at 1;000 FT. I do not remember the altitude but it was around 30;000 FT MSL. We continued our descent to 10;000 and diverted to our home base. I am not sure at this point why we lost pressurization. I am not sure what we could have done different on the descent or the TCAS RA.
Data retrieved from NASA's ASRS site as of April 2012 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.