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Beechcraft king air 200 pilot reported losing the no. 1 right bus; followed a few minutes later by the no. 1 left bus; which resulted in loss of EFIS and cockpit lights.
| Attributes | |
| ACN | 1217761 |
| Time | |
| Date | 201411 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | IMC |
| Aircraft 1 | |
| Make Model Name | Super King Air 200 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Inflight Event / Encounter Weather / Turbulence |
Narrative:
During cruise in level flight the no 1 right bus C/B popped. I did not notice any loss of aircraft function or instrumentation. I had all the anti-ice equipment on as I was in icing conditions. I turned off the right window heat and the aft medcrew lifeport power supply. About 5 min later the left no 1 C/B popped and all cockpit light and EFIS went out. I turned off the forward lifeport power and the anti-ice; I was out of icing conditions at this time; and I turned environmental mod controller to off which turned off the vent blower. I then reset the left No1 C/B and it stayed in for the duration of the flight. I chose not to reset the right NO1 C/B. When I reset the left no 1 C/B the cockpit lights came back one but the EFIS displays would not come back on and only displayed 'dpu fail'. I [advised] ATC and had one of the med crew come up front with me to read the checklist of items that would be affected if the C/B popped again; and to assist with any other potential unknown circumstances that may arise.
Original NASA ASRS Text
Title: Beechcraft King Air 200 pilot reported losing the No. 1 right bus; followed a few minutes later by the No. 1 left bus; which resulted in loss of EFIS and cockpit lights.
Narrative: During cruise in level flight the No 1 right bus C/B popped. I did not notice any loss of aircraft function or instrumentation. I had all the anti-ice equipment on as I was in icing conditions. I turned off the right window heat and the aft medcrew lifeport power supply. About 5 min later the left No 1 C/B popped and all cockpit light and EFIS went out. I turned off the forward lifeport power and the anti-ice; I was out of icing conditions at this time; and I turned environmental mod controller to off which turned off the vent blower. I then reset the LEFT No1 C/B and it stayed in for the duration of the flight. I chose not to reset the right NO1 C/B. When I reset the Left No 1 C/B the cockpit lights came back one but the EFIS displays would not come back on and only displayed 'DPU FAIL'. I [advised] ATC and had one of the med crew come up front with me to read the checklist of items that would be affected if the C/B popped again; and to assist with any other potential unknown circumstances that may arise.
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.