Avionics News January 2021 - 19

Garmin's diversity-capable GTX 335 and GTX 345 ADS-B Out transponders include models TSO'd for use in helicopters.

broadcast (ADS-B Out) is the system's superiority at tracking
Or this old favorite faux definition: " helicopter (n.): a
low-flying aircraft - in urban areas as well as in rural
rotating mass of metal parts, surrounded by an oil leak. "
airspace. But this trait works only as long as the airborne
There's another, similar saw: " helicopter (n.): a rotating
ADS-B system stays connected to one of the Federal Aviation
mass of metal fatigue surrounded by an oil leak. "
Administration's 800-plus ADS-B ground stations.
While it's important to note the bit of truth to these old
And therein we find one of the inherent weaknesses of the
saws, for the most part, helicopters hold a place in the hearts
ground-based ADS-B relay network: the need for a line-ofof many pilots for the various things they do - things no
sight, unobstructed " view " of ground
fixed-wing aircraft can match. Hover
stations necessary for the air traffic
in one spot - arguably the most
control network to " see, " receive and
useful, most used of all helicopter
BRINGING
ADS-B
OUT
TO
relay all that important data on which
traits - as well as launching and
controllers depend.
landing wholly vertically.
THE ROTORCRAFT WORLD
Bringing ADS-B Out to the
Hovering ability allows winchINVOLVED SOLVING
rotorcraft
world involved solving
equipped helicopters to hoist loads
SOME ISSUES SPECIFIC
some issues specific to the aircraft
from the ground to the cabin,
TO THE AIRCRAFT TYPE.
type. Countries looking to satelliteand the reverse, without actually
COUNTRIES LOOKING TO
based ADS-B as their solution
landing. This same operational
SATELLITE-BASED ADS-B
know some of those issues may be
trait also allows helicopters use
AS
THEIR
SOLUTION
resurrected for helicopter ADS-B
of fabric buckets to fill with water
KNOW SOME OF
diversity.
from streams, ponds and lakes, for
THOSE ISSUES MAY BE
We address some of the advantages
dropping on fires.
RESURRECTED
and issues inherent to diversity
And then there's the most useful
FOR HELICOPTER
elsewhere in this issue. For the
lifesaving operations only helicopters
ADS-B
DIVERSITY.
helicopter fleet, these issues can be
perform: helicopter emergency
complicated by that big multiblade
medical services, or HEMS, where
rotor used to keep the chopper aloft.
that vertical launch and landing
ability shines. Next to firefighting,
Maintaining a connection
HEMS put crews at their highest level of risk exposure, the
In some parts of the country, a low-flying helicopter,
risk accompanying landing on unprepared spots in remote
locations - often at night and/or in poor weather.
particularly one descending to a remote locale, may lose its
connection with the ground-station network. Between the
All these sorts of operations require helicopters to fly a
antenna's location on the bottom of most aircraft's fuselage,
significant percentage of their ops at altitudes low enough to
the low altitude and steep angle of the ground station's
make reliable radar tracking problematic.
Of the many advantages credited to the change of
surveillance technology to automatic dependent surveillanceContinued on following page
avionics news

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january

2021

19



Avionics News January 2021

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Avionics News January 2021 - Cover2
Avionics News January 2021 - 1
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Avionics News January 2021 - Cover3
Avionics News January 2021 - Cover4
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