Avionics News April 2015 - 30

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30

avionics news

*

april

2015

NEXTGEN'S NEXT TECHNOLOGY
Continued from page 29

The communication management unit,
such as Universal's UniLink, interfaces with
the flight management system and multifunction displays to route data to the appropriate
display or transmissions system, satcom, VDL
or HF datalink. Which one the system uses depends on signals latency, how long it takes the
message to travel between the cockpit and the
controller. When in range, it communicates
by VHF because it delivers messages more
quickly than the signal relayed through a satellite or the land-based HF radio operators that
feed position reports to ATC.
Most routine data communications involve the "Request" and "Accept" buttons.
Most of today's CPDLC systems require
pilots to enter the message's clearance into
the FMS, according to Miller. For NextGen,
engineers are now defining a CPDLC system
that will allow pilots to accept the ATC instructions and then press another button to
load them directly into the FMS.
In addition to the UniLink CMU, a FANS
installation needs a cockpit voice recorder
that captures all of the CPDLC conversations as well as all those uttered aloud.
Depending on the displays already in the
aircraft, the system may require an annunciater cube and an aural alert to let the crew
know when it has a new message from ATC.
Finally, Miller noted, there is the FMS with
S-BAS - satellite-based augmentation system - the ICAO term for GPS's wide-area
augmentation system, or WAAS.
One benefit of the new avionics mandates
and the systems that meet them is that operators can install them in stages based on the
mission needs, Harpster added. The anchor is
WAAS/GPS, which drives both ADS-B and
FANS, which would be the next stage for any
operator looking at international destinations.
And its CPDLC also opens the door to stepdown free optimized profile descents, which
save time and fuel, available at a growing
number of airports. Regardless of where operators are in their decision-making process,
he recommends that they step-up to WAAS/SBAS because regardless of the decisions that
follow, it "adds value to the aircraft and increases its capabilities." q


http://www.barfieldinc.com

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
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Avionics News April 2015 - Cover3
Avionics News April 2015 - Cover4
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