Avionics News April 2015 - 18

industry

ADS-B In benefits, options and costs make it more popular than
its Out sibling. The poor stepchild, ADS-B In seems to be gaining
converts faster than ADS-B Out, which faces a Jan. 1, 2020,
deadline. A look at the system options provides some clues.

ADS-B IN

Airspace insights beyond the horizon

F

S T O R Y

B Y

D A V E

or years, well-equipped aircraft owners have
lamented the approach of the ADS-B Out mandate.
It doesn't, they complain, bring me anything we
don't already have. No real benefit to them, they said.
Given the costs and lack of direct benefits, they weren't
impressed.
The change conforms to the Federal Aviation
Administration's NextGen effort to improve the precision
of air-traffic surveillance and flow management; increased
precision equals increased capacity, higher flow rates, and
accommodates the International Civil Aviation Organization
requirements.
So in 2020, ADS-B Out generally becomes a requirement
to retain access to airspace now requiring transponders.
And ADS-B In? Compared to ADS-B Out, the poor
stepchild of the system gains more and more acceptance
with fewer complaints - particularly among those in the pilot
community not already blessed with a panel that delivers
situational-awareness tools such as almost-live weather and
traffic.
Lower initial costs, greater appreciation of its benefits
and flexibility of use underpin much of ADS-B In's recent
acceptance. Particularly the cost. As prices decline for both In
and Out compliance, even some past complainers are coming
around.
Those fee-free benefits drive the shift for those who grab
the FAA's ADS-B "carrot" that accompanies the ADS-B
18

avionics news

*

april

2015

H I G D O N

Out "stick." For a few hundred bucks, aircraft owners and
pilots gain access to tools and services once requiring tens
of thousands of dollars in an avionics kit and an ongoing
subscription expense for the weather.
ADS-B Out procrastinators can still wait until 2020 to meet
the Out mandate while enjoying limited benefits of ADS-B
In in the meantime - though they can't enjoy the fullest
measure of benefits without ADS-B Out working its part of
the equation.
The ADS-B Out bar versus the ADS-B In hurdle
ADS-B In receivers come in many forms. At their simplest
and least expensive, one needs nothing more than a portable,
panel-top receiver and a way to display In's services.
That display may be portable, as in smartphone or tablet, or
panel-mounted - as in a multifunction display screen or GPS
display. Those combinations get pilots the bulk of ADS-B In
tools.
Conversely, the ADS-B Out mandate requires installation
of TSO-approved equipment - specifically a position source
and a delivery system to broadcast the GPS data required:
position, altitude, speed and track. The most-common
position source choice falls to TSO'd WAAS GPS receivers
- some navigators usable in the cockpit, others blind position
sources that merely deliver their data.
Two broadcast options exist for ADS-B Out in the U.S.,
the 1090 megahertz Mode S transponder with extended



Avionics News April 2015

Table of Contents for the Digital Edition of Avionics News April 2015

Avionics News April 2015 - Intro
Avionics News April 2015 - Cover1
Avionics News April 2015 - Cover2
Avionics News April 2015 - 1
Avionics News April 2015 - 2
Avionics News April 2015 - 3
Avionics News April 2015 - 4
Avionics News April 2015 - 5
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Avionics News April 2015 - Cover3
Avionics News April 2015 - Cover4
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