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• Airpath Compass Overhaul Instructions

Airpath Compass Overhaul Instructions

Airpath Instrument Co. Magnetic Compasses C2300 Airpath Compass is specifically designed for panel-mount installation.

2 1/4' instrument round with four holes (0.170') in a 2 5/8' mounting circle. Provided with a deviation card, card window and holder easily mounted near compass for easy reference. Compass has black and white markings, standard magnetic compensator, and is non-lighted.

Matte black finish. Meets FAA TSO-C7c requirements. For Cessna 120, 140, 170, Bellanca, Luscombe, Piper Navion and more.

It appears from your picture that you have iron structure in close proximity to your compass. Since the permeability of your structure is air, the earth's magnetic field is going to be sucked into the iron-based structure, travel through it and exit at some point with its strength and direction slightly altered. This is what the compass's compensating magnets are there to do - alter the field back to what it should be. You can't degauss this as the structure is always being re-magnetized by the earth. You can't shield (I hate that term - bend is more descriptive) the compass from the earth's field and expect the compass to still react to it. When we pull the degausser away from the hard iron we are reducing (decaying) the magnetic field as the distance increases. By decaying the field the hysteresis curve becomes smaller and smaller (less magnetism).

By the time we have pulled the degausser to arm's length, the part should be degaussed. We need not pull the degausser too far from the part because for every doubling of the separation distance, the field strength reduces to 1/4 then to 1/16.' At the end of the cycle, the magnetic domains orientation becomes random. The magnetic fields are always present in any object. It's just that you mixed up all the magnetic domains so that they have random directions and all their little fields cancel. For AC magnetic-degaussing to work the initial magnetic field intensity generated by the degausser has to be greater than the part you are demagnetizing. The larger the part or the stronger the magnetism, the stronger your degaussiing tool needs to be. Pandigital multimedia novel 7.

Actual demagnetization occurs only during the time the degausser is being separated from the part. Leaving the degausser in the degaussing field only heats up the degausser and the steel part. There must be no interruption in power during the separation or the incremental reduction will be stopped and the part will be left magnetized. If a power interruption occurs then go back and repeat the process. Complete demagnetization will not occur if the part is still subject to an external (bias) magnetic field. The earth's magnetic field will still be present in the part!