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Hawker 800 experiences erratic cabin pressurization during initial climb. Attempts to control pressurization manually are unsuccessful and the crew elects to return to the departure airport.
| Attributes | |
| ACN | 1066208 |
| Time | |
| Date | 201301 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | BAe 125 Series 800 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Climb |
| Component | |
| Aircraft Component | Pressurization Control System |
| Person 1 | |
| Function | Pilot Not Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
During initial climb out and normal power changes we observed large fluctuations between 1;500 and 2;000 ft per minute on the cabin rate indicator. We also felt and heard abnormal changes in the cabin pressurization. After a brief ATC level off at 6;000 ft we were given further climb to 17;000. Upon advancing the power the main air valve 2 annunciator illuminated. We then accomplished the abnormal checklist which resolved the annunciator. We then manipulated the throttles and illuminated the same annunciator. We were unable to control the cabin rate with the cabin rate control knob throughout the event. The decision was made to return to the point of departure with a hold first to assure an under weight landing. The flight was completed without further events or complications. I do not believe that this event was preventable due to the nature of a mechanical failure. We reached a safe and positive outcome with good CRM; positive discussion; and coordination though crew and ATC.
Original NASA ASRS Text
Title: Hawker 800 experiences erratic cabin pressurization during initial climb. Attempts to control pressurization manually are unsuccessful and the crew elects to return to the departure airport.
Narrative: During initial climb out and normal power changes we observed large fluctuations between 1;500 and 2;000 FT per minute on the Cabin Rate indicator. We also felt and heard abnormal changes in the cabin pressurization. After a brief ATC level off at 6;000 FT we were given further climb to 17;000. Upon advancing the power the main air valve 2 annunciator illuminated. We then accomplished the abnormal checklist which resolved the annunciator. We then manipulated the throttles and illuminated the same annunciator. We were unable to control the cabin rate with the cabin rate control knob throughout the event. The decision was made to return to the point of departure with a hold first to assure an under weight landing. The flight was completed without further events or complications. I do not believe that this event was preventable due to the nature of a mechanical failure. We reached a safe and positive outcome with good CRM; positive discussion; and coordination though crew and ATC.
Data retrieved from NASA's ASRS site as of July 2013 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.