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PRIMUS
R
660 Digital Weather Radar System
A28–1146–111
REV 2
Federal Aviation Administration (FAA) Advisory Circulars
A–2
Precautions
Management and supervisory personnel should establish procedures
for advising personnel of dangers from operating airborne weather
radars on the ground. Precautionary signs should be displayed in
affected areas to alert personnel of ground testing.
GENERAL
D Airborne weather radar should be operated on the ground only by
qualified personnel.
D Installed airborne radar should not be operated while other aircraft
is in the hangar or other enclosure unless the radar transmitter is not
operating, or the energy is directed toward an absorption shield
which dissipates the radio frequency energy. Otherwise, radiation
within the enclosure can be reflected throughout the area.
BODY DAMAGE
To prevent possible human body damage, the following precautions
should be taken:
D Personnel should never stand nearby and in front of a radar antenna
which is transmitting. When the antenna is not scanning, the danger
increases.
D A recommended safe distance from operating airborne weather
radars should be established. A safe distance can be determined by
using the equations in Appendix 1 or the graphs of figures 1 and 2.
This criterion is now accepted by many industrial organizations and
is based on limiting exposure of humans to an average power
density not greater than 10 milliwatts per square centimeter.
D Personnel should be advised to avoid the end of an open waveguide
unless the radar is turned off.
D Personnel should be advised to avoid looking into a waveguide, or
into the open end of a coaxial connector or line connector to a radar
transmitter output, as severe eye damage may result.
D Personnel should be advised that when high power radar
transmitters are operated out of their protective cases, X–rays may
be emitted. Stray X–rays may emanate from the glass envelope
type pulser, oscillator, clipper, or rectifier tubes, as well as
magnetrons.