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While on an avionics test flight; C425 pilot reports flight director and cabin pressure anomalies that result in an altitude deviation below assigned.
| Attributes | |
| ACN | 855328 |
| Time | |
| Date | 200910 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Cessna 425/441 Conquest I/Conquest II |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Descent |
| Route In Use | Vectors |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Pitot-Static System |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Instrument Flight Crew Commercial Flight Crew Flight Instructor Flight Crew Multiengine |
| Experience | Flight Crew Last 90 Days 30 Flight Crew Total 4000 Flight Crew Type 650 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance |
Narrative:
This was an avionics test flight and we were descending to 9000ft. We lost our flight director system due to a static air leak. We then experienced a rapid cabin decompression. ATC asked our altitude and we responded with stand by. We descended 250 feet below our assign altitude due to the excessive trim due to the malfunctioning flight director. Atc cleared us to 7000 feet. We recovered from the excessive trim condition and the rapid cabin decompression. We reported our altitude of 8700 feet to ATC. Corrective action: lots of issues here. By the time we reported our altitude; the near emergency was under control. The controller was busy. I did not see the need to tell him what happened. Maybe I should have; but the problems had been fixed. I'm glad we had a two man crew. Maybe if this happens again I should state we have a problem and then standby. But I thought it is was more important to gain control of the aircraft... Which it was.
Original NASA ASRS Text
Title: While on an avionics test flight; C425 pilot reports flight director and cabin pressure anomalies that result in an altitude deviation below assigned.
Narrative: This was an avionics test flight and we were descending to 9000ft. We lost our flight director system due to a static air leak. We then experienced a rapid cabin decompression. ATC asked our altitude and we responded with stand by. We descended 250 feet below our assign altitude due to the excessive trim due to the malfunctioning flight director. Atc cleared us to 7000 feet. We recovered from the excessive trim condition and the rapid cabin decompression. We reported our altitude of 8700 feet to ATC. Corrective action: lots of issues here. By the time we reported our altitude; the near emergency was under control. The controller was busy. I did not see the need to tell him what happened. Maybe I should have; but the problems had been fixed. I'm glad we had a two man crew. Maybe if this happens again I should state we have a problem and then standby. But I thought it is was more important to gain control of the aircraft... which it was.
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.