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MAXIMUM PERMISSIBLE EXPOSURE LEVEL (MPEL)
FAA advisory circular AC 20-68B defines the method for determining
the MPEL boundary. All personnel should remain beyond the
distance indicated in the illustration below. Manufacturers are
required to calculate two distances; the MPEL boundary is
determined by the greater of these two distances. The first distance is
the near field/far field boundary which is the distance from the
antenna that it takes for the beam to form. The second is the
distance where the radiation level exceeds the U.S. Government
standard of 10 milliwatts per square centimeter. In TEST mode, the
system transmits two 550 microsecond pulses at the beginning of
the test sequence. For the RDR-7000, these distances depend on the
size of the antenna in use. The table below summarizes the various
safe distances for each antenna size.
Safe distance
(for 10 milliwatts
/centimeter
Maximum Permissible
Exposure Level (MPEL)
distance
Safe fuel distance
Test Mode distance
Safety Information
64
IntuVueRDR-7000 Weather Radar Pilot's Guide
2
)
10.1 feet
(3.1 meters)
1.9 feet
(0.6meters)
0.67 inch
(1.7 cm)
RDR-7000
with 18"
Antenna
RDR-7000
with 12"
Antenna
7.0 feet
(2.1 meters)
1.3 feet
(0.4 meters)
0.46 in
(1.2 cm)
D201911000094
Rev 0, Feb 2020
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