jetpilot12 Posted February 15, 2016 Report Posted February 15, 2016 I need help swinging my magnetic compass. I have a 1963 M20C and cannot get my vertical card compass within an expectable range. Last year when my plane was down for annual, I demagnetized all for the exposed tubing. Still no luck. Will a wet compass work any better? Any help will be greatly appreciated Thank you, Jon Quote
mike20papa Posted February 15, 2016 Report Posted February 15, 2016 I had a compass problem. Turned out to be the engine mount bolt that is used for a ground strap attachment. It is the top bolt on the left side. I took a hand held compass and watched it go nuts when I moved it toward the engine cowling. At first I thought it was my battery. Removed it, still compass acted up. Finally pinpointed it to that bolt, took it out and demagnetized it and compass problems disappeared. I guess that all those years of passing a direct current thru it must have magnetized it, but don't really know. Best of luck! 1 Quote
Marauder Posted February 15, 2016 Report Posted February 15, 2016 I installed a Precision PAI-700 with balancing balls which has worked well. I know others have installed the S.I.R.S. Navigation Magnetic Compass. Quote
sleepingsquirrel Posted February 15, 2016 Report Posted February 15, 2016 (edited) I've had good results by replacing the compensator. I think the tiny magnets can loose their effectiveness over the years. http://shop.avionics.co.nz/c21400 Edited February 15, 2016 by sleepingsquirrel Quote
jetpilot12 Posted February 16, 2016 Author Report Posted February 16, 2016 Thank you for your help, I will take a look at everything today! Quote
cliffy Posted February 19, 2016 Report Posted February 19, 2016 Mine works fine without the balancing balls. Guess I'm just lucky on this one Quote
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