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Cl-604 flight crew reported inflight failure of air data computer 1; suspected cause was ice in the static system.
| Attributes | |
| ACN | 1291409 |
| Time | |
| Date | 201508 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | TEB.Airport |
| State Reference | NJ |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Challenger CL604 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Air Data Computer |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Deviation - Speed All Types |
Narrative:
We were climbing from FL390 to FL410 and around FL405 we got an EFIS comp mon warning accompanied with IAS and erroneous altitude on the captain's side. I called for the checklist and the action led us to troubleshoot and determine the failed instruments. We found that the air data computer 1 was failed; and switched the air data computer to 2. The system detected an overspeed; however; seeing the power setting; we determined it was an erroneous indication. The indication led to the clacker continuing for the entirety of being at the altitude. I chose to stay at FL410 because we were on top of the clouds and could see the horizon. Also; with the erroneous overspeed indication; we had a mach trim fail and cas miscomp alert. We advised ATC we are unable rvsm; emailed the company and asked if we should divert to teb; and as we descended; (as the plane got warmer) the clacker went away; the mach trim was able to be engaged; and the captain's air data computer 1 was working normally. I suspect it was due to ice in the static system.
Original NASA ASRS Text
Title: CL-604 flight crew reported inflight failure of Air Data Computer 1; suspected cause was ice in the static system.
Narrative: We were climbing from FL390 to FL410 and around FL405 we got an EFIS COMP MON warning accompanied with IAS and erroneous altitude on the Captain's side. I called for the checklist and the action led us to troubleshoot and determine the failed instruments. We found that the ADC 1 was failed; and switched the ADC to 2. The system detected an overspeed; however; seeing the power setting; we determined it was an erroneous indication. The indication led to the clacker continuing for the entirety of being at the altitude. I chose to stay at FL410 because we were on top of the clouds and could see the horizon. Also; with the erroneous overspeed indication; we had a Mach Trim fail and CAS Miscomp alert. We advised ATC we are unable RVSM; emailed the company and asked if we should divert to TEB; and as we descended; (as the plane got warmer) the clacker went away; the Mach trim was able to be engaged; and the Captain's ADC 1 was working normally. I suspect it was due to ice in the static system.
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.