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LR45 flight crew experiences multiple system failures after pressurization loss at cruise. Declare emergency and divert to safe landing.
| Attributes | |
| ACN | 671577 |
| Time | |
| Date | 200509 |
| Place | |
| Locale Reference | intersection : zzz |
| State Reference | US |
| Altitude | msl single value : 41000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zzz.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Learjet 45 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zzz.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : commercial pilot : instrument pilot : multi engine |
| Experience | flight time last 90 days : 70 flight time total : 5900 flight time type : 200 |
| ASRS Report | 671577 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : first officer |
| Qualification | pilot : cfi pilot : atp pilot : multi engine |
| Experience | flight time last 90 days : 90 flight time total : 12000 flight time type : 400 |
| ASRS Report | 691131 |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : cabin alt warning |
| Resolutory Action | flight crew : diverted to another airport flight crew : declared emergency flight crew : exited adverse environment |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
During cruise flight at FL410; the emergency pressurization system activated without air crew input. An emergency descent was initiated and the crew experienced a cabin duct overheat; cabin altitude warning; loss of communications; and stabilizer trim failure. Aircraft was leveled at 13000 ft; the last altitude assigned prior to communication loss. With apparently unassociated system failures and no ATC contact; the PIC elected to turn north; remain VMC and land at the nearest suitable airport. Communications were established on 121.5 through a relay with an air carrier X flight. The aircraft was cleared for a visual approach to ZZZ where an uneventful landing was made.
Original NASA ASRS Text
Title: LR45 FLT CREW EXPERIENCES MULTIPLE SYS FAILURES AFTER PRESSURIZATION LOSS AT CRUISE. DECLARE EMER AND DIVERT TO SAFE LNDG.
Narrative: DURING CRUISE FLT AT FL410; THE EMER PRESSURIZATION SYS ACTIVATED WITHOUT AIR CREW INPUT. AN EMER DSCNT WAS INITIATED AND THE CREW EXPERIENCED A CABIN DUCT OVERHEAT; CABIN ALT WARNING; LOSS OF COMS; AND STABILIZER TRIM FAILURE. ACFT WAS LEVELED AT 13000 FT; THE LAST ALT ASSIGNED PRIOR TO COM LOSS. WITH APPARENTLY UNASSOCIATED SYS FAILURES AND NO ATC CONTACT; THE PIC ELECTED TO TURN N; REMAIN VMC AND LAND AT THE NEAREST SUITABLE ARPT. COMS WERE ESTABLISHED ON 121.5 THROUGH A RELAY WITH AN ACR X FLT. THE ACFT WAS CLRED FOR A VISUAL APCH TO ZZZ WHERE AN UNEVENTFUL LNDG WAS MADE.
Data retrieved from NASA's ASRS site as of January 2009 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.