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A cessna citation excel captain reported an anomaly with the pitot static system; suspected to be due to icing; which affected the air data computers.
| Attributes | |
| ACN | 1669653 |
| Time | |
| Date | 201907 |
| 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 Excel (C560XL) |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Pitot-Static System |
| Person 1 | |
| Function | Pilot Not Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Inflight Event / Encounter Weather / Turbulence |
Narrative:
At FL370; we were about 20 minutes from ZZZ; we noticed we had a mis-compare between the air data computer 1 and 2 readout. We notified ATC about the problem and requested a descent to find warmer air suspecting we had freezing moisture in our static lines. We worked with ATC the whole way into ZZZ advising them of our misleading altitudes and speeds. We crossed traffic and received a traffic advisory but not an RA. ATC did not mention any issues. We landed and had mx look at the static system. The problem was a large amount of moisture in the static lines. We are working with maintenance to find a static port cover for the plane. We've also mentioned to the plane owner that we could start hangaring the plane to reduce this chances of this problem again.
Original NASA ASRS Text
Title: A Cessna Citation Excel Captain reported an anomaly with the pitot static system; suspected to be due to icing; which affected the air data computers.
Narrative: At FL370; we were about 20 minutes from ZZZ; we noticed we had a mis-compare between the ADC 1 and 2 readout. We notified ATC about the problem and requested a descent to find warmer air suspecting we had freezing moisture in our static lines. We worked with ATC the whole way into ZZZ advising them of our misleading altitudes and speeds. We crossed traffic and received a traffic advisory but not an RA. ATC did not mention any issues. We landed and had mx look at the static system. The problem was a large amount of moisture in the static lines. We are working with maintenance to find a static port cover for the plane. We've also mentioned to the plane owner that we could start hangaring the plane to reduce this chances of this problem again.
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.