Narrative:

Once cleared for takeoff on runway 18L at dfw; we aligned the aircraft on the centerline and verified the runway heading checked with instrument headings. At 400 ft AGL the autopilot was engaged and started a turn to the right of about 30 degrees. The captain quickly disconnected the autopilot and turned the aircraft back towards a heading of 174 degrees and direct towards our first fix. At this time no warning or abnormal annunciations were present. With the data and heading displayed to us; we felt we were turning back to our proper course. At that time we noticed the FMS was indicating the winds aloft at 1500 ft MSL to be 360 degrees at 120 KTS. ATC advised us that our heading was off by 30 degrees to the left. At that time we knew we had a heading display malfunction and took vectors from ATC. We advised ATC of the maintenance issue and continued to take vectors as we worked out the problem. At 6;000 ft MSL the pilot's side pfd and mfd displayed red 'magnetic' warning flags and all data on the pilot's side was lost. We transferred flight controls to the co-pilot's side. At that time the captain's pfd and mfd seemed to reset itself. We slaved both co-pilot's and captain's directional gyros and the heading difference was corrected. We advised ATC the problem had been resolved and continued to ZZZ without any further incidents. Once level at our assigned cruise altitude we contacted our assistant chief pilot. We notified him of the issue and informed him that all systems seemed to be working normal now. The captain and the assistant chief pilot agreed to continue the flight and write up the problem once in ZZZ. We suspect both ahrs #1 and remote dg flux valve had malfunctioned. The aircraft was written up and grounded for maintenance in ZZZ.

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Original NASA ASRS Text

Title: BE400 Captain reports heading deviation departing DFW runway 18L due to compass system malfunction. Strong winds aloft were also reported.

Narrative: Once cleared for takeoff on Runway 18L at DFW; we aligned the aircraft on the centerline and verified the runway heading checked with instrument headings. At 400 FT AGL the autopilot was engaged and started a turn to the right of about 30 degrees. The Captain quickly disconnected the autopilot and turned the aircraft back towards a heading of 174 degrees and direct towards our first fix. At this time no warning or abnormal annunciations were present. With the data and heading displayed to us; we felt we were turning back to our proper course. At that time we noticed the FMS was indicating the winds aloft at 1500 FT MSL to be 360 degrees at 120 KTS. ATC advised us that our heading was off by 30 degrees to the left. at that time we knew we had a heading display malfunction and took vectors from ATC. We advised ATC of the Maintenance issue and continued to take vectors as we worked out the problem. At 6;000 FT MSL the Pilot's side PFD and MFD displayed red 'MAG' warning flags and all data on the Pilot's side was lost. We transferred flight controls to the Co-Pilot's side. At that time the Captain's PFD and MFD seemed to reset itself. We slaved both Co-Pilot's and Captain's Directional Gyros and the heading difference was corrected. We advised ATC the problem had been resolved and continued to ZZZ without any further incidents. Once level at our assigned cruise altitude we contacted our Assistant Chief Pilot. We notified him of the issue and informed him that all systems seemed to be working normal now. The Captain and the Assistant Chief Pilot agreed to continue the flight and write up the problem once in ZZZ. We suspect both AHRS #1 and remote DG flux valve had malfunctioned. The aircraft was written up and grounded for Maintenance in ZZZ.

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.