STBY Compass and Gyro compass going haywire
Dear All,
I currently fly the Challenger 850 and some days ago we made a fuel stop in Yekaterinburg.
Some minutes after shutdown we got an Efis Miscomp (because CMD and FO headings were split) Its normal sometimes if we stand close to hangars etc etc.
During the taxi out it continued, and we tried to manually align the gyros with stb compass.
On line up we did the final manual inputs to align with runway heading.
We departed and airborne we got the Efis Miscomp message again. We were wings level. And the STB compass was turning by itself for almost 50 degrees,
FMS calculated winds of 70kts at 5000' (which seems rather unlikely due that on landing the wind was around 15kt)
Then later after 15000' all slowely went back to Normal.
Now my question is. What can cause the magnetic systems so act so erratic?
I noted on ground that there were som Mil activity of taxing AN12 aircraft.
Also the Primary and SSR radar were located in the middle of the airfield between the two runways.
Can there be some relation between powerful Primary radars and compas misbehaving?