Avionics News October 2019 - 48

AVIDYNE TEACHES LEGACY COCKPITS NEW TRICKS
Continued from page 47

teaching legacy avionics new tricks. This software protocol
speaks the legacy languages in the Collins Pro Line 21 and
the FGC-3000 Digital Flight Control System. GLAS also
interfaces directly with the Honeywell legacy EFIS systems
and Primus 1000, as well as Sperry SPX500-equipped
aircraft. Counting the number of airplanes in which these
systems are installed, "they represent more than 9,000
tails that are eligible for the upgrade," said Dave Miner,
Avidyne's general manager for business aviation.
"Not being a software guy, I can say (GLAS) was an
easy upgrade," Miner said. "We just changed a bunch of
ones and zeros. In reality, it wasn't complicated, but it was
challenging, and it involved a lot of aircraft testing to earn
the TSO that gives the software its pedigree."
Speaking the legacy system's language is just part of
the challenge. Approved flight manual supplements must
explain the new capabilities and flight procedures, Schwinn
noted, and the right annunciations must tell the pilots when

48

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2019

the jet is doing something it has never done before. While
the airplane thinks it is flying an ILS, the annunciation tells
the pilots that the avionics is flying an LPV approach.
Avidyne's STC upgrade includes a variety of
annunciators that are determined by the legacy system.
"Basic GPS annunciation is in the pilot's field of view,"
Miner said. "APCH 1, APCH 2, Waypoint 1, Waypoint 2,
Integrity 1, and Integrity 2. When going from a single FMS
airplane to a dual FMS airplane, we needed to differentiate
which FMS was giving you a message."
In dual FMS airplanes, the CJ1+, and CJ2+, and CJ3,
Avidyne added a control annunciator that is calls APR+B.
"If you want to use FMS 2 (our IFD545, a GPS-only
IFD550), the pilot leaves the switch in Auto. With the
switch off, it is a single FMS airplane," Miner said.
The Cessna CitationJet 525/A is the launch airframe for
Avidyne's IFD 5-series FMS navigator retrofit program.
Following closely behind are STCs for the CJ1+, CJ2+,
and CJ3. In addition to giving these jets new capabilities,
it surmounts the economic hurdle, Harper added. In most
cases, upgrading a pre-WAAS flight management system


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