Narrative:

With first officer flying; climbing through FL300 to FL330; air data computer 2 failed. Complied with QRH. After performing QRH; ATC cleared us to FL280 out of rvsm.flight attendants were kept in the loop of partial loss of avionics.dispatcher was notified of air data computer 2 failure; complied with QRH; everything was under control and we would be contact him on ground.on descent; passengers were advised that we had lost partial avionics; everything was normal.landed and taxied to gate without further incident. Made write-up after contacting line maintenance. Followed up a phone call to dispatcher that we were on gate and aircraft had a write-up. Initially; the cloud conditions could have been a threat. Shortly before the failure; we ascended into VMC conditions on top of cloud layers. Remaining VMC was critical until the event could be properly assessed and appropriate checklist was run to regain normal conditions through redundancy. Shortly after running the checklist; and informing ATC of return to normal operation; we were given a clearance to FL280 requiring a descent through clouds to leave rvsm altitudes. The first officer remained very calm and was instrumental in properly assessing the situation. The event reinforced the need for maintaining proficient systems knowledge and also occasional review of QRH procedures. Both pilots had seen the failure in a previous training event. The company cannot prevent mechanical failures. However; the company (training department) can continue presenting training scenarios that incorporate these type failures. There were no warning or caution messages annunciated in this event on either EICAS screen. However; there were 3 red outlined box flags on the failed side; and one red outlined box around 'FD' on the normal side. Once we determined it was an air data computer 2 failure; the QRH index was used for direction to abnormal 12-7 for air data computer 2 failure. The index is an invaluable resource for quick reference and should always be emphasized.

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Original NASA ASRS Text

Title: CRJ-900 Captain reported they experienced a failure of the Air Data Computer Number 2.

Narrative: With FO flying; climbing through FL300 to FL330; ADC 2 failed. Complied with QRH. After performing QRH; ATC cleared us to FL280 out of RVSM.Flight attendants were kept in the loop of partial loss of avionics.Dispatcher was notified of ADC 2 failure; complied with QRH; everything was under control and we would be contact him on ground.On descent; passengers were advised that we had lost partial avionics; everything was normal.Landed and taxied to gate without further incident. Made write-up after contacting line maintenance. Followed up a phone call to dispatcher that we were on gate and aircraft had a write-up. Initially; the cloud conditions could have been a threat. Shortly before the failure; we ascended into VMC conditions on top of cloud layers. Remaining VMC was critical until the event could be properly assessed and appropriate checklist was run to regain normal conditions through redundancy. Shortly after running the checklist; and informing ATC of return to normal operation; we were given a clearance to FL280 requiring a descent through clouds to leave RVSM altitudes. The FO remained very calm and was instrumental in properly assessing the situation. The event reinforced the need for maintaining proficient systems knowledge and also occasional review of QRH procedures. Both pilots had seen the failure in a previous training event. The Company cannot prevent mechanical failures. However; the Company (Training Department) can continue presenting training scenarios that incorporate these type failures. There were no warning or caution messages annunciated in this event on either EICAS screen. However; there were 3 red outlined box flags on the failed side; and one red outlined box around 'FD' on the normal side. Once we determined it was an ADC 2 failure; the QRH index was used for direction to Abnormal 12-7 for ADC 2 failure. The Index is an invaluable resource for quick reference and should always be emphasized.

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.