Narrative:

On climb-out; I lost the #1 adahrs; while troubleshooting that failure I received a TCAS failure warning; acknowledged the TCAS failure and returned to troubleshooting the adahrs failure. Then I received an alternator failure annunciation. I acknowledged the alternator failure and did an alternator controller circuit breaker pull and reset; this fixed the alternator failure. I turned my attention back to the aircraft and noticed that I had climbed through my assigned altitude of FL230. I contacted ATC and advised them of my altitude deviation and reported that I have had an avionics problem. They acknowledged and cleared me to FL260. I acknowledged FL260 and then received a cabin altitude 10K annunciation. I acknowledged the cabin altitude10K; silenced the horn; and selected a lower altitude on the pressurization controller and requested FL240 from ATC. Monitored pressurization and determined that we were pressurized; just not holding maximum pressure. Asked ATC for FL240 as a final and we had no more problems from the pressurization. I turned my attention back to the adahrs. I was finally able to get the adahrs to come back online; but by that time it had lost its initialization and would be useless the rest of the flight. I was able to restore function to all failed components except the adahrs. I advised ATC of my reduced operational capacity and continued the flight with no further problems.

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Original NASA ASRS Text

Title: A P46T pilot lost the #1 ADAHRS and while troubleshooting that and other related failures experienced an altitude deviation.

Narrative: On climb-out; I lost the #1 ADAHRS; while troubleshooting that failure I received a TCAS failure warning; Acknowledged the TCAS failure and returned to troubleshooting the ADAHRS failure. Then I received an Alternator failure annunciation. I Acknowledged the alternator failure and did an alternator controller circuit breaker pull and reset; this fixed the Alternator failure. I turned my attention back to the aircraft and noticed that I had climbed through my assigned altitude of FL230. I contacted ATC and advised them of my altitude deviation and reported that I have had an avionics problem. They acknowledged and cleared me to FL260. I acknowledged FL260 and then received a cabin altitude 10K annunciation. I Acknowledged the cabin altitude10K; silenced the horn; and selected a lower altitude on the pressurization controller and requested FL240 from ATC. Monitored pressurization and determined that we were pressurized; just not holding maximum pressure. Asked ATC for FL240 as a final and we had no more problems from the pressurization. I turned my attention back to the ADAHRS. I was finally able to get the ADAHRS to come back online; but by that time it had lost its initialization and would be useless the rest of the flight. I was able to restore function to all failed components except the ADAHRS. I advised ATC of my reduced operational capacity and continued the flight with no further problems.

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.