Rod Callison Posted December 23, 2020 Report Posted December 23, 2020 I have a 1999 M20R. It has a semi-circle compass-deviation card under the mag compass. My A/P just re-calibrated the compass after an avionics upgrade, and tacked a square white paper tag on the compass that looks really kludgy. Are semi-circle metal cards still available? Quote
carusoam Posted December 24, 2020 Report Posted December 24, 2020 Welcome aboard Rod! Do you have a favorite MSC? The compass card is supplied by the compass manufacturer... Expect airpath to be the brand name... The right model number will reveal the proper deviation card... like this one.... or similar to this one... https://www.airpathcompass.com/J30/index.php/catalog/commercial/c-2400-l4vm-12-b-detail Other short cuts... you might try Dan at Lasar... or you might contact Airpath directly to see where to buy it... PP thoughts only, not a mechanic... Best regards, -a- Quote
Rod Callison Posted December 24, 2020 Author Report Posted December 24, 2020 Thank you! Favorite MSC is Don Maxwell. You've given me 3 sources to try, and I'm sure I'll get this solved. 1 Quote
jaylw314 Posted December 24, 2020 Report Posted December 24, 2020 Out of curiosity, I asked the Google lady and couldn't find anything. Aircraft Spruce sells a paper card holder that is marginally better than a sticker. Obviously, finding a deviation plate from a salvage yard won't help, and buying a new compass would be silly (I also wonder if Airpath only sells new ones with that paper card holder instead of the deviation plate now). Probably the easiest thing to do would be to print out the deviation card on a label shaped like the deviation plate, trim it to size and apply it to the metal plate. You could print the card with white text on a black background to make it look better. If it doesn't stick well or if your plate is in bad shape, it wouldn't be too hard to fabricate a new one out of aluminum sheet. Quote
Immelman Posted December 24, 2020 Report Posted December 24, 2020 It could be a rainy day computer project to recreate the card in the correct dimensions in a word processor or power point. Quote
Rod Callison Posted February 23, 2021 Author Report Posted February 23, 2021 Thanks for the suggestions everyone! Airpath had trouble matching my 22-year-old compass. Plan B: scanned the deviation card, used photo-editing to change deviation numbers to current values, printed it on label paper, cut out the semi-circular deviations, and stuck it on the original aluminum deviation card. Good as new. 2 Quote
Yetti Posted February 24, 2021 Report Posted February 24, 2021 I would do something silly like cutting a thin piece of alum and then using number punches to make a mark Quote
carusoam Posted February 24, 2021 Report Posted February 24, 2021 Great follow-up Rod! Let us know when you actually use it... Best regards, -a- Quote
N201MKTurbo Posted February 24, 2021 Report Posted February 24, 2021 On 12/23/2020 at 4:03 PM, Rod Callison said: I have a 1999 M20R. It has a semi-circle compass-deviation card under the mag compass. My A/P just re-calibrated the compass after an avionics upgrade, and tacked a square white paper tag on the compass that looks really kludgy. Are semi-circle metal cards still available? Read the help files for Word.... Quote
Hank Posted February 24, 2021 Report Posted February 24, 2021 I took a picture of mine, measured it, then fired up Excel and typed the numbers. Put lines around / between them to match, then copied it into several places. Make each one a different font size and print the sheet. Take it to the plane, see which one fits best, cut it out and "laminate" both sides with clear packing tape and go for it! 2 Quote
1964-M20E Posted February 24, 2021 Report Posted February 24, 2021 I know it is required to have it in the plane. However, how many people have actually used the compass deviation card ever even during PPL training? I can't recall ever using it. I have rarely used the magnetic deviation lines on sectionals since here in New Orleans it is only 1 degree W at the current time. A couple of years ago it was 0 and when I got may PPL it was only 2 maybe 3 E. Quote
Hank Posted February 24, 2021 Report Posted February 24, 2021 3 minutes ago, 1964-M20E said: I have rarely used the magnetic deviation lines on sectionals since here in New Orleans it is only 1 degree W at the current time. A couple of years ago it was 0 and when I got may PPL it was only 2 maybe 3 E. I used to use the little dotted purple lines all the time. The change from WV to WY was signficant, too. But I just checked--they don't appear on my EFB! So I went to Airnav, checked a secional there, no mag deviation lines. Checked the airport writeup, no mention there, either, just gives the actual magnetic heading of the runway. What are they teaching these days??? Quote
MikeOH Posted February 24, 2021 Report Posted February 24, 2021 It's 12 degrees here in southern California...that's a 12 mile error over 60 miles travelled! Better take that into account Back in my PPL days (1978) pre-GPS and out of range of a VOR, you'd best take a four degree compass error into account, as well. 1 Quote
carusoam Posted February 24, 2021 Report Posted February 24, 2021 Our runway number changed once... From 27 to 28. Probably happens every century or so... Best regards, -a- Quote
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