Dynon Avionics EFIS-D10 Installation Guide - Manual (Page 13)

EFIS-D10 Installation Manual
EFIS-D10 Installation Guide Doc Num: 100006-000 Rev. C
9/11/2003 Page 13 of 24
A Caution about Magnetic Fields
Later on, you will be calibrating out any airplane-dependent constant magnetic fields that may
bias the EFIS-D10’s internal magnetometers. Magnetic fields come from a variety of sources in
the aircraft including avionics, electric gyroscopes, ferrous metal panels, and the aircraft itself.
Care should be taken to find a place as far away as possible from sources of magnetic fields
while still following the placement guidelines above. Ideally, the combination of a good
instrument location and the heading calibration process should eliminate most effects of constant
magnetic fields within the aircraft. However, it may be necessary to use an external
magnetometer unit in conjunction with your unit. If this is the case, follow the instructions listed
below in “Selecting an external magnetic sensor probe location” below).
Selecting an external magnetic sensor probe location (if applicable)
If you have opted to use the external magnetic sensor probe, finding a good location for this
instrument is critical to an accurate EFIS-D10 heading display. Keep in mind that calibration can
compensate for small static fields superimposed upon earth’s field, but cannot take into account
changing effects like ac and non-constant dc currents and non-stationary ferrous material. Take
into consideration the following points when selecting a location for the probe.
• Keep the probe away from any source of magnetic fields (such as electrical equipment
and current-carrying wires) and ferrous material.
o
Moving a handheld compass throughout the space surrounding your location can
test the suitability of your chosen location. If the needle deviates significantly
from true North in any given area, that location would not be ideal for the EDC-
D10.
• The EDC-D10 must be mounted
such that its orientation is as closely
aligned with the EFIS-D10 as
possible. It should be mounted with
the long axis parallel to the wings,
the electrical connector facing
toward the front of the plane, and the
mounting tabs on the bottom. The
bracket used to hold the EDC-D10
must account for all differences in angles between the EFIS-D10 and the EDC-D10. This
includes pitch, roll, and yaw. We recommend you use an electronic level that reads to
1/10
th of a degree to make sure the EDC-D10 is aligned with the EFIS-D10 in pitch and
roll to better than 2/10 th of a degree.
• All mounting hardware needs to be non-ferrous material such as aluminum, plastic, or
brass. Many stainless steel screws are alloys with some ferrous material in them. If the
item is attracted to a magnet, it should not be used in the installation. The EDC-D10
needs to be mounted in a location as free from magnetic interference as possible. This
means away from any ferrous nuts, bolts, and screws, aircraft tubing, and wires carrying
any appreciable current such as strobe light wiring.