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A learjet 35A captain experienced a failure of the pressurization system during a climb out in the bos area. The reporter declared an emergency and landed safely at their destination airport.
| Attributes | |
| ACN | 466572 |
| Time | |
| Date | 200003 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : zbw.artcc |
| State Reference | NH |
| Altitude | msl bound lower : 10000 msl bound upper : 28000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw.artcc |
| Operator | common carrier : air taxi |
| Make Model Name | Learjet 35 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | descent : approach |
| Route In Use | arrival : vfr |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air taxi |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 70 flight time total : 10000 flight time type : 3500 |
| ASRS Report | 466572 |
| Person 2 | |
| Affiliation | company : air taxi |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial pilot : multi engine |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude other anomaly other |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : took evasive action flight crew : declared emergency |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
At FL280, with a planned climb to FL350, the aircraft cabin began an uncontrolled ascent in excess of 6000 FPM. An emergency descent was initiated to 10000 ft and an emergency was declared with ZBW while in the descent. At 10000 ft the cabin was pressurized and the manual pressurization of the cabin was possible. At that time, the flight was continued to destination airport (lbe). The aircraft problem was deferred per the MEL and the flight continued (after disembarking passenger) to its home base of agc at 3000 ft. To the best of my knowledge, no deviations were required of other aircraft while in the emergency descent.
Original NASA ASRS Text
Title: A LEARJET 35A CAPT EXPERIENCED A FAILURE OF THE PRESSURIZATION SYS DURING A CLBOUT IN THE BOS AREA. THE RPTR DECLARED AN EMER AND LANDED SAFELY AT THEIR DEST ARPT.
Narrative: AT FL280, WITH A PLANNED CLB TO FL350, THE ACFT CABIN BEGAN AN UNCTLED ASCENT IN EXCESS OF 6000 FPM. AN EMER DSCNT WAS INITIATED TO 10000 FT AND AN EMER WAS DECLARED WITH ZBW WHILE IN THE DSCNT. AT 10000 FT THE CABIN WAS PRESSURIZED AND THE MANUAL PRESSURIZATION OF THE CABIN WAS POSSIBLE. AT THAT TIME, THE FLT WAS CONTINUED TO DEST ARPT (LBE). THE ACFT PROB WAS DEFERRED PER THE MEL AND THE FLT CONTINUED (AFTER DISEMBARKING PAX) TO ITS HOME BASE OF AGC AT 3000 FT. TO THE BEST OF MY KNOWLEDGE, NO DEVS WERE REQUIRED OF OTHER ACFT WHILE IN THE EMER DSCNT.
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.