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Date:  12-12-2009
Number of Hours:  5.50
Manual Reference:  
Brief Description:  Magnetometer Mount 1

I'm using two Crossbow magnetometers so as to have two independent EFIS systems. Trying to find a suitable place to mount them is problematic. AFS specifies 24 inches from moving ferrous materials or significant current wires or possible magnetic influences. The fuselage is difficult because of the steel tubing. The wings are probably not suitable until past the aileron linkage, and even then coming up with a mount that's accessible and adjustable to match the EFIS box orientation in pitch and roll in the wing bays is tough. RV's have put them with some success in the wing tip, which is accessible when the fairing is removed. The potential conflicts are the metal hinges on the outboard ailerons (23 inches), and the strobe power supply (28 inches) and the actual strobe (20 inches).
AFS suggested using a compass and approaching the "too close" items, and seeing if the compass bearing changes, with and without the power on for the electrical items and with movement of the ferrous items. My Twin Comanche has the same strobe system, and there was no compass deviation within a few inches. Movement of the aileron hinge caused no deviation within a couple inches.
I bought a couple SafeAir1 magnetometer mounts, but they won't directly work without making a new bracket with 0.15 inch spacers to raise the bracket above the lightening hole flanges and provide mounting surface after removing the second most aft vertical stiffener and riveting the bracket in place. Space has to be allowed in order to rivet the top skin, too. It took a few tries to get this right. Also, alodining and priming was undertaken. The actual final positioning will wait until the wings are mounted.
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Trial fit.

Trial fit.

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Riveted in place.

Riveted in place.

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Drawing.

Drawing.

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