Originally Posted by
Jan Olieslagers
I have exactly the same as referred to by GtE. It works well, yet would work better if I could spare the time and effort to get it properly adjusted. Have you tried any adjustment on yours?
I'd be happy to receive some guidelines to this adjustment: I imagine one could do the "course" part on the ground, rotating the plane by steps of 30 or 45 degrees and adjusting until it reads ok; then confirm in flight by checking against GPS? I should think the first part can easily take two or three rounds... Is there a published procedure, somewhere?
Set up systems and power on the ground as near as possible to flight condition. Point the aircraft to an externally referenced magnetic north.
Adjust the N-S screw, to set the compass reading correctly.
Now point the aircraft East, do the same to the E-W screw.
Now point the aircraft south, remove half the error with the N-S screw.
Now point the aircraft west, remove half the error with the E-W screw.
And normal practice is to then rotate the aeroplane in 30 degree heading changes right around, by external reference, recording the headings, and then translate that to a correction card in the cockpit.
G