VAL Avionics NAV 2000 Guide d'installation télécharger pdf (Page 30)

System Planning

2-8 SkyView System Installation Guide - Revision R

dynamic magnetic fields (e.g., AC currents, non-constant DC currents, and non-stationary

ferrous material such as electric turn coordinators and control surfaces). Thus, you must avoid

mounting the module close to sources of dynamic magnetic fields, avoid wires that carry large

amounts of current, and use non-magnetic fasteners for installation (see caution below).

Dynon’s general rule of thumb is that 1 to 2 feet between the module and sources of magnetic

fields is generally good enough, but 2 or more feet is better.

Stainless steel mounting hardware is not always non-magnetic, and thus is not

recommended. The best type of mounting hardware (screws, bolts, washers, nuts)

to install the SV-ADAHRS-200/201 is brass.

If you use a magnet to test whether possible interfering materials are non-

magnetic, do not actually touch the magnet to the material you are testing, as this

contact can cause the material you are testing to become magnetized.

Move a handheld compass throughout the space surrounding your intended

location to get a rough idea of the suitability of the area. Note that this test should

be done with major aircraft systems operating (e.g., strobe lights and radios on)

because some systems can cause magnetic interference. If the compass needle

deviates significantly from magnetic North or cycles back and forth, the location is

not ideal for ADAHRS installation.

Figure 2–ADAHRS Installation Orientation

An ADAHRS module should be mounted within one degree of parallel to all three aircraft axes,

with the pneumatic fittings facing toward the front of the aircraft. The module’s mounting tabs

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VAL Avionics NAV 2000 Guide d'installation Page 30