• • • • • Adjusting an Airpath compass • If this is your first visit, be sure to check out the. If you haven't already -. Then you will have to and pay your club membership dues to have full access to the site. If you have registered and haven't joined the club or you are a member and have lapsed, you will need to pay your club membership dues before you get full access to the site including the ability to post and access most features: click the Join link above to get started/back. If your are unsure of the mechanics of payment, check out the great article. To start viewing messages, select the forum that you want to visit from the selection below.
Jan 24, 2012 Arent they reuseable parts? I’m told that it’s in the Magneto overhaul manual, so doing it by the book means new hardware. Jump to content. A new diaphragm from Aircraft Spruce for the Airpath compass is rumored to have fixed it. Leaking magnetic compass. *Members that donate $10 or more do not see.
Fly-Ins, the Event Calendar and a few other areas are open to the public as a general public service. Cloyd, I just did this on my plane. The left screw adjusts N-S and the right screw adjusts E-W. You may know the proceedure but I will relay it anyway.
Line your plane up on runway centerline and adjust your DG to runway heading (make sure gyro is spun up and reliable, good runway reference line). Turn plane to North heading and zero out the error with N-S. Turn plane to South heading and split the error difference with N-S. Turn plane to North and verify error is in tolerance of south, repeat if necessary. Turn plane to East heading and zero out the error with E-W. Turn plane to West heading and split the error difference with E-W. Turn plane to East and verify error is in tolerance of west, repeat if necessary.
Thats the basic proceedure, pretty easy. Depending on gyro you might re-set during the procedure. I also double check heading when back on runway heading. You can then turn the plane to required compass rose positions to update the card. I was able to get my error to 0-1 deg on all headings and this was with old compass (but new DG).
If it is that old and losing fluid it is time for a reseal, not a refill. Try to stick to the correct fluid, I had one that someone figured on an alternative fluid and it turned out to be a great solvent for the glue that holds the compass card onto the float. (the compass card is the conical strip of thin plastic with NSEW etc printed on it, stuck to the part which rides the pivot) So the card had slipped off and was not exactly functional anymore. A 'pal of mine' has found that if you have enough fluid, (after installing new seals) immersing the entire compass in the fluid, then moving it about to remove every last tiny bubble, then screwing the cap on the top whilst still immersed - is the best way to get all the air out. Do the pv=nrt for me, but it seems like a 140F cabin will eventually make the tiniest bubble increase the pressure beyond the limits of the expansion bellows. But I know nothing of this personally, as I am not an instrument crs. If you don't know how to do it, I suggest you don't try.
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The compass refill kits from Aircraft Spruce and other suppliers contain instructions for the process (as well as the necessary fluid and the new seals which are a really good idea if your compass needs refilling), but if you can't figure out how to remove your compass and open it up, you should get someone who does know how to supervise your work. BTW, even though the compass fairy has been known to visit many hangars when the FAA isn't looking, it's not legal for anyone other than an instrument repair shop to do this. So if the compass fairy does visit, don't create any documentation of that visit in your aircraft maintenance records for the FAA to find and use against whoever signed the entry. That said, I just noticed you have a vertical card compass like this.not a classic Airpath wet compass like this: That's a lot harder to work on, and I suggest you don't try doing it yourself unless you really know what you're doing.
The mechanical portion of that vertical card compass is extremely delicate and thus easy to damage. I suggest that rather than trying to refill it yourself, you take it to an instrument repair shop with the tools and expertise to disassemble, refill, and restore it to proper working condition. If you look at the design of the wet compass, the plug is not a service port. It should never require service between overhauls as there is no way for fluid to escape or evaporate other than a leak. The plug is just how it's filled following a rebuild. Of course there is no rocket science involved in rebuilding a wet compass and the only calibration for the unit is a swing which is performed by an A&P anyway because the calibration procedure can only be accomplished after installation in the aircraft, not on a bench in an instrument shop.