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Cessna citation pilot reported the illumination of a cabin door seal warning light; followed by a loss of cabin pressure warning came on during cruise. A descent was executed; and a successful diversion a suitable airport was accomplished.
| Attributes | |
| ACN | 1497075 |
| Time | |
| Date | 201711 |
| 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 V/Ultra/Encore (C560) |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Interior Door |
| Person 1 | |
| Function | Pilot Flying Single Pilot |
| Qualification | Flight Crew Multiengine Flight Crew Instrument Flight Crew Flight Instructor Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 60 Flight Crew Total 5300 Flight Crew Type 500 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
About 10 minutes after reaching our cruise altitude of 40;000 feet; the door seal light illuminated. I prepared for an emergency descent and asked for a lower altitude. ATC approved it and a few seconds later a loud sound was heard from the door as the pressure started escaping. I started my emergency descent down to 10;000 feet and informed ATC of my intention to divert. Upon inspection by a mechanic; it was found that condensation had built up in the door seal after heavy rain two nights before. That condensation froze and caused the seal malfunction. The water was drained; and the trip continued uneventfully.
Original NASA ASRS Text
Title: Cessna Citation pilot reported the illumination of a cabin door seal warning light; followed by a loss of cabin pressure warning came on during cruise. A descent was executed; and a successful diversion a suitable airport was accomplished.
Narrative: About 10 minutes after reaching our cruise altitude of 40;000 feet; the door seal light illuminated. I prepared for an emergency descent and asked for a lower altitude. ATC approved it and a few seconds later a loud sound was heard from the door as the pressure started escaping. I started my emergency descent down to 10;000 feet and informed ATC of my intention to divert. Upon inspection by a mechanic; it was found that condensation had built up in the door seal after heavy rain two nights before. That condensation froze and caused the seal malfunction. The water was drained; and the trip continued uneventfully.
Data retrieved from NASA's ASRS site 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.