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A cessna 425 in cruise at FL230 made an emergency descent and diverted due to loss of cabin pressure caused by a failed bleed air shutoff valve solenoid and air duct separation.
| Attributes | |
| ACN | 480994 |
| Time | |
| Date | 200008 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : crg.airport |
| State Reference | FL |
| Altitude | msl single value : 23000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zjx.artcc tower : vny.tower |
| Operator | general aviation : personal |
| Make Model Name | Cessna Twin Turboprop Undifferentiated or Other Model |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other vortac |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : single pilot |
| Qualification | pilot : private pilot : instrument pilot : multi engine |
| Experience | flight time last 90 days : 15 flight time total : 1825 flight time type : 460 |
| ASRS Report | 480994 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : cabin altitude indicator other flight crewa |
| Resolutory Action | flight crew : diverted to another airport |
| Consequence | other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Aircraft |
Narrative:
Aircraft was at cruise altitude of FL230. There occurred sudden loss of cabin pressurization. The reason or cause is unknown at this time. Pilot recognized serious nature of aircraft pressurization failure, 1) immediately pulled off all power, placed aircraft into emergency descent, 2) then pulled off headset and put on oxygen mask and to hook up communication cables, and then 3) advised ZJX of sudden loss of pressurization and that pilot had commenced emergency descent. The pilot/mechanics do not know reason for sudden loss of pressurization. Pilot descended to 11000 ft, as assigned by ATC, and completed flight to destination airport without further incident, but aircraft would not pressurize. Callback conversation with reporter revealed the following information: the reporter stated the loss of cabin pressure was caused by 2 failures. The reporter said a solenoid failed on the bleed air shutoff valve allowing it to close and was coupled with an air duct separation.
Original NASA ASRS Text
Title: A CESSNA 425 IN CRUISE AT FL230 MADE AN EMER DSCNT AND DIVERTED DUE TO LOSS OF CABIN PRESSURE CAUSED BY A FAILED BLEED AIR SHUTOFF VALVE SOLENOID AND AIR DUCT SEPARATION.
Narrative: ACFT WAS AT CRUISE ALT OF FL230. THERE OCCURRED SUDDEN LOSS OF CABIN PRESSURIZATION. THE REASON OR CAUSE IS UNKNOWN AT THIS TIME. PLT RECOGNIZED SERIOUS NATURE OF ACFT PRESSURIZATION FAILURE, 1) IMMEDIATELY PULLED OFF ALL PWR, PLACED ACFT INTO EMER DSCNT, 2) THEN PULLED OFF HEADSET AND PUT ON OXYGEN MASK AND TO HOOK UP COM CABLES, AND THEN 3) ADVISED ZJX OF SUDDEN LOSS OF PRESSURIZATION AND THAT PLT HAD COMMENCED EMER DSCNT. THE PLT/MECHS DO NOT KNOW REASON FOR SUDDEN LOSS OF PRESSURIZATION. PLT DSNDED TO 11000 FT, AS ASSIGNED BY ATC, AND COMPLETED FLT TO DEST ARPT WITHOUT FURTHER INCIDENT, BUT ACFT WOULD NOT PRESSURIZE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE LOSS OF CABIN PRESSURE WAS CAUSED BY 2 FAILURES. THE RPTR SAID A SOLENOID FAILED ON THE BLEED AIR SHUTOFF VALVE ALLOWING IT TO CLOSE AND WAS COUPLED WITH AN AIR DUCT SEPARATION.
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.