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2.4.1 Interference Sources
Avoid mounting the antenna near active electrical components whenever possible. General clearance
guidelines are:
• Strobe lamps and power supplies - 5 ft. (1.5 meters)
• Pitch trim servos and amplifiers - 3 ft. (1 meter)
• Fluorescent lamps and ballasts - 5 ft. (1.5 meters)
• Heater ignitors - 5 ft. (1.5 meters)
• Air conditioner and heater blowers - 5 ft. (1.5 meters)
• DME/Transponder/TCAS antennas - 4 ft., Minimum (1.2 meters)
• Inflight telephone antennas - 4 ft. (1.2 meters)
• VHF comm. antennas - 1 ft. (.3 meters)
• ADF antennas - 1 ft. (.3 meters)
• Any current-carrying cable - 2 ft. (0.6 meters)
Stormscope® sensors are adversely affected by the build up of static charges. Do not mount the antenna
near any composite materials (e.g., plastic covers, radomes, fiberglass housings, windows, etc.) as these
devices can build up objectionable static charges.
2.4.2 Skin Current
Avoid mounting the antenna in the ground return
current path between the battery and alternator,
and the battery and blower motors or other heavy
current carrying equipment. Aircraft skin currents
may cause antenna interference.
2.4.3 Skinmapping
In order to reduce potential interference problems, some of which are evident only during flight, a skinmap
of the aircraft must be performed (with engines and all electrical systems operating) prior to every
installation. This procedure will save installation time by avoiding the necessity for such things as antenna
relocation. A WX-SM Skinmapper (Goodrich Avionics Systems P/N 78-8060-5859-6, with Mod 2 installed)
must be used to verify the suitability of a selected antenna location before proceeding with the installation.
This must be done even if all the other placement criteria are met.
2.4.4 Ground Plane
The antenna must mount in a location with a
minimum of 12 inches (30 cm) continuous
aluminum ground plane in all directions. Avoid
hinge lines, gear doors, and access panels by at
least 12 inches (30 cm). Do not mount the antenna
on an access panel.
2-4
Rev. C
WX-950
Installation Manual
12" MIN.
ALTERNATOR
SKIN CURRENT
BATTERY
ANTENNA
ACCESS PANEL
ANTENNA
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