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Date: Fri, 16 Aug 2013 08:00:18 -0400
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Subject: Re: [LML] Re: Compass calibration
From: Charles Brown <browncc1@verizon.net>
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There's an excellent discussion at =
http://www.faa-aircraft-certification.com/compass-swing-requirements.html

The quoted regs say (to my surprise) that the calibration has to be done =
in level flight, and the calibration card has to state whether the =
calibration applies with radios on or off (seems like a very dated reg!)

I used a compass rose per Garmin 1000 installation manual to calibrate =
my magnetometer.  EXPERIENCE NOTE!  Rebar in concrete was enough to =
defeat the calibration process, the Garmin sent up a red flag and =
nothing worked until I went to a compass rose on asphalt.

I got my wet compass to within 2 degrees and I'm an illegal scum running =
around with no calibration card.  Hasn't killed me yet though.

Charley
Legacy 280 hr

On Aug 15, 2013, at 5:34 PM, Greenbacks, UnLtd. wrote:

If you could adjust out all compass error, are you still required to =
have a correction card posted in the cockpit next to the compass?
Also, is a compass rose of any practical benefit for checking the =
compass, given given the accuracy of on board GPS units?

Angier Ames
N4ZQ
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