"The utilisation of 5G devices onboard aircraft could
lead to risks of interference that could potentially result in errors in
altitude readings," a spokesman for
the agency told AFP.
The potential phenomenon is due to "signal interference
from a close frequency source of a strength that is similar or even superior to
that of altimeters."
This interference can cause errors "in instruments that
are extremely critical during landing," said the agency, known by its
French acronym DGAC.
It sent a bulletin on the issue to airlines last week,
recommending that 5G phones should either be turned off completely or put in
"airplane mode" during flight
Most countries have long required that mobile phones be
turned off or placed in airplane mode due to concerns that previous generations
of mobile telecommunications networks can interfere with a plane's navigation
and communication equipment.
The DGAC also recommended that in cases of disruption to an
aircraft's equipment that the flight crew immediately notify air traffic controllers
who can then alert authorities at the airport.
DGAC also noted that it had laid out conditions for the
positioning of 5G base stations in order to limit the risks of interference
during landing at French airports.
The strength of signals from 5G base stations placed near
France's main airports has been restricted, said the DGAC, which has been
conducting additional testing since November when French telecommunications
operators were given the green light to begin rolling out 5G services.
It is continuing to monitor 5G base stations around all
French airports in cooperation with the agency responsible for radio
frequencies.
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