Date: 201506
Local time of day: 1201-1800
Location: ZZZ.Airport, US
Flight conditions: VMC
Light: Daylight
Aircraft: Gulfstream G200 (IAI 1126 Galaxy)
Operator: Air Taxi
Operating under: Part 91
Flight plan: IFR
Mission: Passenger
Flight phase: Initial Climb
Airspace: Class B ZZZ
ATC / advisory: TRACON ZZZ
Aircraft component: Compass (HSI/ETC)
Component problem: Malfunctioning
Reporter organization: Fractional
Reporter function: Captain; Pilot Flying
Reporter qualification: Flight Crew Air Transport Pilot (ATP)
Second reporter function: Pilot Not Flying; First Officer
Anomaly: Aircraft Equipment Problem Less Severe; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Detector: Person Flight Crew
When detected: In-flight
Result: Flight Crew Overcame Equipment Problem
Contributing factors: Aircraft
Primary problem: Aircraft

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.


Second narrative: During initial climbing out turn crew detected EFIS mis-compare [and] heading flags during turn to assigned heading. Situation analysis revealed both DGs in error; left vs. right about 80 degrees; right side DG froze during turn. Turned off window heat to observe whiskey compass to determine our actual magnetic course; at the same time ATC questioned us and we advised of compass failures. Asked for turn vectors to correct course. After a short time during straight and level flight system corrected itself. Monitored system and no other abnormalities noted. Aircraft written up.This aircraft has a long history of these problems. In the G200 Program Memos; under G200 Heading Anomalies 1-D1 magnetic flux low levels; or magnetic anomalies. 'Those caused by distortion of the magnetic field of the earth and those caused by the vertical component; or dip; of the magnetic field of the earth' are listed. These systems are getting old and we are starting to see more issues. Replace the flux detectors.


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