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Md-83 captain reported a CADC malfunction related to the pitot/static anti-ice system being overwhelmed by the weather conditions.
| Attributes | |
| ACN | 1518240 |
| Time | |
| Date | 201802 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZJX.ARTCC |
| State Reference | FL |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | MD-83 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Air Data Computer |
| Person 1 | |
| Function | Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Inflight Event / Encounter Weather / Turbulence |
Narrative:
Just west of szw in the weather at FL330 the central air data computer (CADC)2 fail light illuminated on the FMS scratch pad. Following procedures we switched to CADC both on CADC1. A short time later both primary airspeeds and mach began to decay and autothrottles increased to [autothrottle] limit. I checked the standby airspeed and it was normal. We accomplished the unreliable airspeed memory item. Exited the weather and were about to [advise ATC] when everything went back to normal. Entered the weather one more time and it happened again; but quickly corrected itself. Continued flight with no further events. Pitot/static heat couldn't keep up with the weather conditions.
Original NASA ASRS Text
Title: MD-83 Captain reported a CADC malfunction related to the pitot/static anti-ice system being overwhelmed by the weather conditions.
Narrative: Just west of SZW in the weather at FL330 the Central Air Data Computer (CADC)2 fail light illuminated on the FMS scratch pad. Following procedures we switched to CADC both on CADC1. A short time later both primary airspeeds and Mach began to decay and autothrottles increased to [autothrottle] limit. I checked the standby airspeed and it was normal. We accomplished the Unreliable Airspeed memory item. Exited the weather and were about to [advise ATC] when everything went back to normal. Entered the weather one more time and it happened again; but quickly corrected itself. Continued flight with no further events. Pitot/static heat couldn't keep up with the weather conditions.
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.