Pilot's Guide to Avionics 2017-2018 - 39
Many general aviation airports are
located in or near airspace that
requires ADS-B equipage. Without
ADS-B Out onboard, pilots
will need to seek exceptions
from air traffic controllers
to depart from their home
airport, which might not
be granted or could
lead to delays.
the surveillance part of the FAA's comprehensive Next
Generation Air Transportation System modernization of
the U.S. air traffic system.
Pilots who fly from general aviation airports in or
near congested airspace may not have studied how
Class B and C airspace or a Mode C veil might affect
their operations to and from their home airport. ADS-B
Out is required in all three of these types of airspace
under the FAA rule.
You should confirm whether the following types of
ADS-B airspace around some general aviation airports
could affect your operations:
CLASS B AIRSPACE: Airspace from the
surface to 10,000 feet above mean sea
level surrounding the nation's busiest 37
airports in terms of instrument flight rules
operations or passenger enplanements.
Airspace configuration is individually tailored
and consists of a surface area and two or
more layers. Class B is designed to contain
all published instrument procedures once an
aircraft enters the airspace.
MODE C VEIL: This airspace within a
30-nautical-mile radius of a Class B airport
from the surface to 10,000 feet requires aircraft
to have a Mode C transponder with altitude
CLASS C AIRSPACE: Class C airspace usually
consists of a 5-nm radius core surface area from
the surface up to 4,000 feet above the airport
elevation, and a 10-nm radius shelf area that
extends no lower than 1,200 feet up to 4,000 feet
above airport elevation. These airports have an
operational control tower, are serviced by a radar
approach control, and have a certain number
of IFR operations or passenger enplanements.
There are more than 120 Class C airports in the
"Some pilots of aircraft based near Class B or C
airports may find they did not anticipate the impact of
the FAA's ADS-B rule when it takes effect in 2020,"
said Rune Duke, the Aircraft Owners and Pilots
Association's director of government affairs for airspace
and air traffic. "If they fly in Class B or C airspace or in
the Mode C veil, they need to be equipped."
Class B and C airspace is shaped like an inverted
wedding cake. Even if a general aviation airport is
not covered by the bottom layer, an aircraft may pass
through Class B or C airspace on the way to or from a
runway. The Mode C veil around 37 Class B airports with
a 30-nm radius extends from the surface to 10,000 feet.
General aviation hotspots often correlate to
congested airspace where ADS-B is mandated in New
York, Florida, California and Texas.
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