Beechjet 400
Flight Crew Instrument; Flight Crew Multiengine
Aircraft Equipment Problem Critical; Flight Deck / Cabin / Aircraft Event Other / Unknown
Air Traffic Control Issued New Clearance; Flight Crew Landed in Emergency Condition; Flight Crew Returned To Departure Airport; Flight Crew Diverted
Aircraft
After engine start and starting to taxi we had a red Flight Director FD box and red MAG on the captain side. We pulled off to the runup area before runway XY. The captain called maintenance and they advised to shut down completely and restart. After doing that all annunciations were clear and we taxied to the runway. No issues during initial takeoff and climb out. During the continued climb the Captain's SDU went black for a few min and then came back on. After that it went out again and my Status Display Unit (SDU)went black and started back up again. The left SDU seemed to stay black and the right side was continuing to go on and off. We decided to return back to ZZZ with the unreliable SDUs and unknown if the issue with the MAG on the left side would return. We asked ATC to return. When sent back to Approach they asked for souls and fuel on board. No issues on the return back; landing was normal.
During taxi we had a red MAG and FD flag on the pilot side PFD and Navigational Display. After contacting maintenance they advised a complete shutdown and reset. After restarting the aircraft no flags were present and everything functioned normally. During climbout; the Pilot side Status Display Unit (SDU) failed. The SDU would function briefly; then fail again. As we were discussing returning to ZZZ; the co-pilot side SDU began to do the same thing. We advised ATC that we had an instrument malfunction and needed to return to PIT and that we did not need further assistance at this time. They asked if we were declaring an emergency and we said no. ATC did provide excellent service from the Center controller all the way to the Tower; asking us occasionally if we needed any additional help. We told them no each time; but did thank them after landing.
BE-400 Flight Crew reported an Status Data Unit error message followed by intermittent PFD and Navigational Display failures on both the Captain and First Officer's displays.