Avionics News October 2015 - 34

industry

STC GIVE
AND TAKE
Trig, Peregrine partnership grows ADS-B Approved Model List
S T O R Y

A

B Y

S C O T T

M .

S P A N G L E R

supplemental type certificate is the Federal Aviation Administration's approval to modify an original aircraft
design. It itemizes the approved changes to an aircraft's type certificate and embodies test data on how those
changes affect the original design. Earning one is not a quick or uncomplicated process, but this shared goal has
forged a close partnership between Trig Avionics, based in the United Kingdom, and Peregrine, a 6-year-old Colorado
company that provides advanced systems engineering services and integrated electronic solutions for Part 23 and Part
25 aircraft seeking STCs or type certification.
For some, according to Andy Davis, Trig's chief executive officer, the ADS-B STC requirement "is an interesting
quibble." Posing a rhetorical question, "Is it really necessary or sensible, because the system does not change the airframe, powerplant or aircraft performance?"
Stand-alone systems, such as a transponder, don't require an STC because its
manufacturer has demonstrated and documented its intended use and installation requirements through the unit's certification, he explained. When an
avionics shop follows this guidance, "it will perform as designed because all
the functions and messages are all inside the box."
But ADS-B is not a stand-alone system. "Any system with
Trig Avionics' TC20 and TT21
multiple components has a higher degree of complexity," he
Photo courtesy of Trig Avionics
continued, and how a shop installs the combination of components can affect its performance. Position accuracy, fault
detection, integrity, error condition, "almost any WAAS GPS
gets this bit right, but it is the additional information that's
important," Davis said.
"Look at the ADS-B performance requirements: latency,
fault protections, relative latency between velocity and position
reports, time to detect a failed satellite, and the integrity report the
system sends. None of these could be solved by the most gifted installer.
You'd never figure it out by looking at the manual. You have to work with the
design data, because you really don't know that the arbitrary combination of a GPS
34

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

Avionics News October 2015 - Intro
Avionics News October 2015 - Cover1
Avionics News October 2015 - Cover2
Avionics News October 2015 - 1
Avionics News October 2015 - 2
Avionics News October 2015 - 3
Avionics News October 2015 - 4
Avionics News October 2015 - 5
Avionics News October 2015 - 6
Avionics News October 2015 - 7
Avionics News October 2015 - 8
Avionics News October 2015 - 9
Avionics News October 2015 - 10
Avionics News October 2015 - 11
Avionics News October 2015 - 12
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Avionics News October 2015 - 14
Avionics News October 2015 - 15
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Avionics News October 2015 - 17
Avionics News October 2015 - 18
Avionics News October 2015 - 19
Avionics News October 2015 - 20
Avionics News October 2015 - 21
Avionics News October 2015 - 22
Avionics News October 2015 - 23
Avionics News October 2015 - 24
Avionics News October 2015 - 25
Avionics News October 2015 - 26
Avionics News October 2015 - 27
Avionics News October 2015 - 28
Avionics News October 2015 - 29
Avionics News October 2015 - 30
Avionics News October 2015 - 31
Avionics News October 2015 - 32
Avionics News October 2015 - 33
Avionics News October 2015 - 34
Avionics News October 2015 - 35
Avionics News October 2015 - 36
Avionics News October 2015 - 37
Avionics News October 2015 - 38
Avionics News October 2015 - 39
Avionics News October 2015 - 40
Avionics News October 2015 - 41
Avionics News October 2015 - 42
Avionics News October 2015 - 43
Avionics News October 2015 - 44
Avionics News October 2015 - 45
Avionics News October 2015 - 46
Avionics News October 2015 - 47
Avionics News October 2015 - 48
Avionics News October 2015 - 49
Avionics News October 2015 - 50
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Avionics News October 2015 - 53
Avionics News October 2015 - 54
Avionics News October 2015 - 55
Avionics News October 2015 - 56
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Avionics News October 2015 - 73
Avionics News October 2015 - 74
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Avionics News October 2015 - 78
Avionics News October 2015 - 79
Avionics News October 2015 - 80
Avionics News October 2015 - Cover3
Avionics News October 2015 - Cover4
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