Narrative:

During a training flight; during one of the maneuvers; both the first officer and I noticed various annunciators flicker on and off. We then noticed smoke coming out of the shroud panel in front of us. We immediately accomplished the memory items and upon turning the battery and master gens to emergency; the smoke stopped. We then opened the manual pressurization knob and the smoke exited the cockpit. We declared an emergency and got vectors back to our departure airport. At this point we were in and out of broken layers of clouds. I was the flying pilot; and we were flying on the emergency gages. We discussed as a crew that we would turn the battery back on long enough to get the gear down and full flaps down. We accomplished a normal approach. The first officer had read the systems that would not be functional due to the electrical power being off. Upon touching down I tried the brakes and they were very mushy and didn't work. The first officer immediately broke the safety wire; removed the clip and applied the emergency brake. Upon applying the emergency brake; the plane began to skid and the right main tire popped. We were able to keep the plane on the runway. I cut the power; secured the aircraft and we both exited the plane. Emergency vehicles were standing by and at our plane by the time we stopped.

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Original NASA ASRS Text

Title: Flickering cockpit annunciators followed by smoke emanating from behind a shroud panel instigated an emergency declaration and a return to the departure airport for a BE400 Flight Crew on a training mission. One main gear wheel failed during application of the emergency brake on the landing roll.

Narrative: During a training flight; during one of the maneuvers; both the First Officer and I noticed various annunciators flicker on and off. We then noticed smoke coming out of the shroud panel in front of us. We immediately accomplished the memory items and upon turning the battery and master gens to emergency; the smoke stopped. We then opened the manual pressurization knob and the smoke exited the cockpit. We declared an emergency and got vectors back to our departure airport. At this point we were in and out of broken layers of clouds. I was the flying pilot; and we were flying on the emergency gages. We discussed as a crew that we would turn the battery back on long enough to get the gear down and full flaps down. We accomplished a normal approach. The First Officer had read the systems that would not be functional due to the electrical power being off. Upon touching down I tried the brakes and they were very mushy and didn't work. The First Officer immediately broke the safety wire; removed the clip and applied the emergency brake. Upon applying the emergency brake; the plane began to skid and the right main tire popped. We were able to keep the plane on the runway. I cut the power; secured the aircraft and we both exited the plane. Emergency vehicles were standing by and at our plane by the time we stopped.

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.