Narrative:

On climb out with clearance to turn to heading 040 the heading miscompare light illuminated on the pfd as the aircraft was turning.... ATC questioned our heading I compared my RMI to the co pilots RMI his RMI was frozen and then rotated... I then notice my RMI was 60 degree out from the right RMI .... At that time I informed ATC that our compass system has failed and that I was trouble shooting the system.... ATC cleared us to a way point... When level flight was attained at a safe attitude the crew aligned their RMI's to the standby compass using dg mode.... After approximately 10 minutes in flight the RMI functioned normally in slaved mode- this is the normal position...after seeing the owners off safely I called maintenance and aog the aircraft; requesting that the system be inspected... There are no preambles to prevent this occurrence... The heading 'heading' miscompare on the pfd will illuminate at some known locations on the ground prior to take off but this failure occurred after departure in a climb in a turn with no warning... This failure would be a very good training failure in re-current... Immediate corrective procedure during this failure is to inform ATC and request a direct- to a waypoint - this immediately allowed the crew to maintain their situation awareness in congested airspace. The long range navigation in the G200 is GPS driven; separate from the flux valves driving the RMI's.

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Original NASA ASRS Text

Title: G-200 flight crew reported noticing heading miscompare warning after takeoff. Reporter stated the aircraft 'has a long history of these problems.'

Narrative: On climb out with clearance to turn to heading 040 the heading miscompare light illuminated on the PFD as the aircraft was turning.... ATC questioned our heading I compared my RMI to the co Pilots RMI his RMI was frozen and then rotated... I then notice my RMI was 60 degree out from the right RMI .... At that time I informed ATC that our compass system has failed and that I was trouble shooting the system.... ATC cleared us to a way point... When level flight was attained at a safe attitude the crew aligned their RMI's to the standby compass using DG mode.... After approximately 10 minutes in flight the RMI functioned normally in slaved mode- this is the normal position...After seeing the owners off safely I called Maintenance and AOG the aircraft; requesting that the system be inspected... There are no preambles to prevent this occurrence... The heading 'HDG' miscompare on the PFD will illuminate at some known locations on the ground prior to take off but this failure occurred after departure in a climb in a turn with no warning... This failure would be a very good training failure in re-current... Immediate corrective procedure during this failure is to inform ATC and request a direct- to a waypoint - this immediately allowed the crew to maintain their situation awareness in congested airspace. The long range NAV in the G200 is GPS driven; separate from the flux valves driving the RMI's.

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.