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A P180 flight crew had pressurization issues at FL350 and started down without clearance because ATC was on a landline for several minutes.
| Attributes | |
| ACN | 848579 |
| Time | |
| Date | 200908 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.VOR |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | P180 Avanti |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Pressurization System |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Flight Instructor Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine |
| Experience | Flight Crew Last 90 Days 280 Flight Crew Total 4100 Flight Crew Type 750 |
| Person 2 | |
| Function | Pilot Not Flying First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Instructor |
| Experience | Flight Crew Last 90 Days 200 Flight Crew Total 2000 Flight Crew Type 700 |
| Events | |
| Anomaly | ATC Issue All Types Aircraft Equipment Problem Critical Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance |
Narrative:
Our aircraft experienced pressurization issues at FL350. In the midst of our problem; ATC was on the landline and unavailable for descent authorization. After four radio calls the controller returned. We had begun our initial descent to FL180. The amount of altitude deviation prior to authorization was probably less than 300 ft and did not result in loss of separation.
Original NASA ASRS Text
Title: A P180 flight crew had pressurization issues at FL350 and started down without clearance because ATC was on a landline for several minutes.
Narrative: Our aircraft experienced pressurization issues at FL350. In the midst of our problem; ATC was on the landline and unavailable for descent authorization. After four radio calls the Controller returned. We had begun our initial descent to FL180. The amount of altitude deviation prior to authorization was probably less than 300 FT and did not result in loss of separation.
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.