Aircraft weather radar is specifically designed to emit a
concentrated beam of microwave energy at potentially hazardous
power levels. These hazards include the possibility of injury to
ground personnel, ignition of flammable materials, including fuel,
and damage to sensitive electronic devices. The pilot in command
is responsible for management of the radar system.
The FAA has published an Advisory Circular, AC 20-68B,
Recommended Radiation Safety Precautions for Airborne Weather
Radar, with basic guidelines for safe radar operation.
U.S. Government standards for human exposure to microwave
radiation permit a maximum level of 10 mW per square centimeter.
When the radar is operating, this level may be exceeded within the
area indicated in the figure below. According to information
published by the radar manufacturer, strict observance of this
boundary whenever the radar is operating should provide adequate
protection.
Exposure of ground personnel or other aircraft occupants to
microwave energy emitted at positions within the MPEL boundary
depicted in below may be hazardous. Be aware that the MPEL
boundary is determined with respect to the antenna, not the radome or
any other aircraft structure. The MPEL boundary shown below applies
only to units specifically approved for use with the EX500. The MPEL
boundary shown below does not guarantee protection against ignition
of flammable materials or damage to sensitive electronic equipment
exposed to microwave energy from your radar.
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