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A CRJ200's number two air data computer (ADC2) failed during the takeoff roll. The captain continued the takeoff on ADC1 and the standby airspeed but declared an emergency and returned to land.
| Attributes | |
| ACN | 853897 |
| Time | |
| Date | 200909 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | Regional Jet 200 ER/LR (CRJ200) |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Takeoff |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Air Data Computer |
| Person 1 | |
| Function | Captain Pilot Flying |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
On takeoff roll received an 'EFIS comp mon' message with no associated factors. Approximately V1 noticed an amber IAS caution flag on captain's pfd and first officer lost airspeed data. Cross checked standby and my primary airspeeds and continued with takeoff. Autopilot was engaged to facilitate workload but displayed oscillations despite being selected to the functional air data computer. Disconnected autopilot and declared emergency while returning for landing. ADC2 failed.
Original NASA ASRS Text
Title: A CRJ200's number two Air Data Computer (ADC2) failed during the takeoff roll. The Captain continued the takeoff on ADC1 and the standby airspeed but declared an emergency and returned to land.
Narrative: On takeoff roll received an 'EFIS Comp Mon' message with no associated factors. Approximately V1 noticed an amber IAS caution flag on Captain's PFD and FO lost airspeed data. Cross checked standby and my primary airspeeds and continued with takeoff. Autopilot was engaged to facilitate workload but displayed oscillations despite being selected to the functional ADC. Disconnected Autopilot and declared emergency while returning for landing. ADC2 failed.
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.