Avionics News July 2016 - 43

the aircraft's reported position; Source
Integrity Level, the probability of
the reported horizontal position
exceeding the NIC containment
radius; and the System Design
Assurance, the probability of
a malfunction causing false
or misleading information to
be transmitted. The specific
requirements of each are defined by
1090 ES's TSO-C166b and UAT's
TSO-C154c.
A 250-watt 1090 ES
transponder, the XPNDR-261
In 2015, as explained on
is a TSO'd unit produced in
its online ADS-B FAQs, "For
partnership with Trig Avionics.
experimental category aircraft,
Photos courtesy of Dynon Avionics
there is no FAA approval required
for the ADS-B Out system installation."
does a manufacturer face when starting from scratch,
So owners of experimental, amateur-built aircraft have a
without a certified GPS navigator to leverage? It's not as
choice: they can install a TSO'd ADS-B Out system, or
hard as one might imagine.
they can install uncertified equipment that comes with a
"Let's start with the TSO, which covers many things
manufacturer's statement that it complies with the TSO's
not
related to performance, like painting the box
performance compliance.
orange," said Ian Jordan, chief systems architect for
The Federal Aviation Administration expects owners
Dynon Avionics. The example for his discussion focused
to install the compliant ADS-B system according to
on Dynon's SV-GPS-2020, a TSO-compliant WAAS/
the manufacturer's instructions. And it expects the
GPS position source for ADS-B systems in experimental,
manufacturers "to perform appropriate engineering
amateur-built aircraft.
efforts to ensure the equipment
In providing the manufacturer's
complies with all requirements"
statement
of compliance, "it's up to
in the performance sections of the
IN 2015, AS EXPLAINED ON
us
to
read
the regulations and the
applicable TSOs before issuing their
ITS ONLINE ADS-B FAQS,
TSO and use our own engineering
statements of compliance. Owners
"FOR EXPERIMENTAL
verification process, which we've
must include the statement in their
been using for quite a long time,
CATEGORY AIRCRAFT,
aircraft records to help resolve any
to show ourselves that we met the
in-service issues, should they arise.
THERE IS NO FAA
spirit and specific performance
Performance monitoring is
APPROVAL REQUIRED
requirements. In that regard, it wasn't
part of the ADS-B system, "and
FOR THE ADS-B
a huge challenge," Jordan said.
if the equipment or installation is
"Earning a TSO is essentially
determined to be noncompliant, the
OUT SYSTEM
self-certification, and the FAA
operator may not be able to enter
INSTALLATION."
audits that process when it will
the airspace" until the equipment
issue a TSO," he explained. In
or installation is brought into
documenting experimental avionics
compliance. In such a situation,
compliance with TSO performance standards, "we didn't
bringing the system back into compliance is a matter for
have to follow the more prescriptive processes used in
the owner and, depending on the source of the problem,
the TSO, like DO-178 software development; we could
the manufacturer or shop that installed the equipment.
use the processes that were much more familiar to us,
Given their experience in earning TSO certification
processes that we'd already proved their efficacy for all
for their WAAS/GPS navigators, manufacturers easily
the other systems we make."
leverage that technology and engineering tests to create
less expensive TSO-compliant GPS position sources.
Continued on following page
Garmin's GPS 20A is an example. But what challenges
avionics news

*

july

2016

43



Table of Contents for the Digital Edition of Avionics News July 2016

No label
Avionics News July 2016 - Intro
Avionics News July 2016 - Cover1
Avionics News July 2016 - Cover2
Avionics News July 2016 - No label
Avionics News July 2016 - 2
Avionics News July 2016 - 3
Avionics News July 2016 - 4
Avionics News July 2016 - 5
Avionics News July 2016 - 6
Avionics News July 2016 - 7
Avionics News July 2016 - 8
Avionics News July 2016 - 9
Avionics News July 2016 - 10
Avionics News July 2016 - 11
Avionics News July 2016 - 12
Avionics News July 2016 - 13
Avionics News July 2016 - 14
Avionics News July 2016 - 15
Avionics News July 2016 - 16
Avionics News July 2016 - 17
Avionics News July 2016 - 18
Avionics News July 2016 - 19
Avionics News July 2016 - 20
Avionics News July 2016 - 21
Avionics News July 2016 - 22
Avionics News July 2016 - 23
Avionics News July 2016 - 24
Avionics News July 2016 - 25
Avionics News July 2016 - 26
Avionics News July 2016 - 27
Avionics News July 2016 - 28
Avionics News July 2016 - 29
Avionics News July 2016 - 30
Avionics News July 2016 - 31
Avionics News July 2016 - 32
Avionics News July 2016 - 33
Avionics News July 2016 - 34
Avionics News July 2016 - 35
Avionics News July 2016 - 36
Avionics News July 2016 - 37
Avionics News July 2016 - 38
Avionics News July 2016 - 39
Avionics News July 2016 - 40
Avionics News July 2016 - 41
Avionics News July 2016 - 42
Avionics News July 2016 - 43
Avionics News July 2016 - 44
Avionics News July 2016 - 45
Avionics News July 2016 - 46
Avionics News July 2016 - 47
Avionics News July 2016 - 48
Avionics News July 2016 - 49
Avionics News July 2016 - 50
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Avionics News July 2016 - 53
Avionics News July 2016 - 54
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Avionics News July 2016 - 57
Avionics News July 2016 - 58
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Avionics News July 2016 - 60
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Avionics News July 2016 - 80
Avionics News July 2016 - Cover3
Avionics News July 2016 - Cover4
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