EFD1000 Installation Manual
DOCUMENT # A-01-126-00 PAGE 54-225 Revision H
© Copyright 2009 Aspen Avionics Inc.
Place a small handheld compass in the proposed RSM mounting location and move the
compass around the location looking for needle deflection. There should be no more
than 2º of compass needle movement within an area 18”x 18” around the proposed
location. Should the compass show excessive needle movement it will be required to
find a new location or, if feasible, treat the affected area with a degaussing coil.
Contact Aspen Avionics product support for information on obtaining or using a
handheld degaussing coil. A degaussing coil can be purchased at most audio and
video stores.
Operate flight controls from stop to stop and verify no more than 2º of compass needle
movement. Should the compass show excessive needle movement it will be required
to find a new location or degauss the flight control cables and or flight control
hardware.
Operate all electrical systems. The compass needle should not deflect more than 2
degrees during testing.
If a location cannot be found with less than 2 degrees of deflection then the electrical
device causing the interference will need to be determined. The device causing the
interference may need to be re-bonded or the wiring may need to be relocated.
If the compass does not show any deflection from electrical or mechanical sources then
that location should be acceptable to mount the RSM.
NOTE: If it is impossible to find a suitable mounting location in the preferred area
it may be permissible to mount the RSM above the cabin. A location
will need to be found that is a minimum of 18 inches from any small cabin
speakers or electronic device that can cause compass fluctuations. Large
cabin speakers may cause RSM interference at distances up to 3 feet. Use the
above procedure with the handheld compass to locate a quiet area. During
operation of the electrical systems concentrate on those devices that are in
the cabin and within the headliner. Be aware that headsets and other items
worn by and operated by the flight crew and passengers could potentially
interfere with the RSM. Typically this would be when the headset is within 12”
of the RSM location. Find a location that cannot be affected by passenger and
flight crew headsets while seated and moving about the cabin.
6.9.2 Pressurized Aircraft
On pressurized aircraft it will be necessary for the RSM wiring to penetrate the aircraft
pressure vessel. The installer is responsible for obtaining proper documentation and
FAA approvals from either the airframe manufacturer or from a DER or FAA field office
for any penetrations of the pressure vessel or bulkhead.
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