Pilot's Guide to Avionics 2014-2015 - 78

ADS-B INSTALLATIONS
Continued from page 77

ADS-B Essentials: Part 3

FAA ADS-B installation guidance
Guidance on the installation of ADS-B Out avionics for
aircraft with a standard airworthiness certificate; these
aircraft can broadcast ADS-B data on 1090 ES avionics
and/or on 978 MHz UAT avionics .
1 .

Refer to AC 20-165A for guidance on the installation and testing of ADS-B Out avionics on aircraft
with a standard airworthiness certificate .

2 .

ADS-B Out avionics must be approved by the
FAA with a TSO (technical standard order) when
installed on an aircraft with a standard airworthiness certificate . Approved ADS-B Out avionics will
be marked with either TSO-C166b (1090 ES) or
TSO-C154c (UAT) on the equipment's attached
data plate . Do not install non-TSO ADS-B avionics
on Part 23 and Part 25 aircraft, or Part 27 and
Part 29 rotorcraft .

other ADS-B equipped aircraft but allow for
the avionics to receive FAA traffic and weather
broadcast services: TIS-B and FIS-B . Contact
the manufacturer of non-TSO ADS-B Out avionics for instructions on how to ensure SIL and
SDA parameters are configured properly prior to
operation .

3 .

Installation of approved ADS-B avionics on an
aircraft with a standard airworthiness certificate
must be through a supplemental type certificate,
approved model list associated with an STC, or
field approval under certain conditions . Refer
to the FAA policy memo for more information at
www .faa .gov/about/office_org/headquarters_offices/avs/offices/afs/afs300/media/Major_Repair_Alteration_Job-Aid .pdf .

Guidance on the installation of uncertified ADS-B
Out avionics (1090 ES or UAT) on amateur-built aircraft
and light sport aircraft that have experimental airworthiness certificates:
*

Guidance on the installation of both 1090 ES and
UAT ADS-B systems on the same aircraft:

Non-TSO ADS-B Out avionics may be installed
on amateur-built and light sport aircraft with
experimental airworthiness certificates . In such
installations, the ADS-B Out system must be
configured to transmit a system integrity level
and system design assurance of zero (SIL/
SDA=0) . The SIL/SDA=0 settings prevent
ADS-B data of unknown quality and integrity
from being processed by ATC automation and

It is acceptable to equip an aircraft with both a
1090 ES and UAT ADS-B Out system . When
properly configured, such installations allow
pilots to take full advantage of available ADS-B
broadcast services and capabilities . Care must
be taken to ensure the systems are configured
properly to avoid possible issues with ATC and
other ADS-B aircraft . The FAA recommends that
aircraft equipped with both a 1090 ES and UAT
system be configured to transmit ADS-B data
from the 1090 ES system only and set to receive data on both systems (if applicable) . This
configuration will comply with all ADS-B Out
airspace equipment requirements and maximize
use of ADS-B broadcast services (TIS-B and
FIS-B) . The FIS-B service is available only with
UAT systems over the 978 MHz frequency .

Use of portable ADS-B Out systems: Portable ADS-B
Out systems, also known as "suitcase" units, should
not be operated (transmitting) aboard any aircraft .
While marketing associated with these units may imply
approval for use by way of an FCC license, the FAA
prohibits their use for the following reasons:
1 .

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The positioning of portable, suction-cup GPS
antennas associated with these units often
require they be affixed to front or side windows
or glareshield to obtain a usable signal . Such antenna placement obstructs the pilot's view . Wiring
connecting the antennas to the suitcase unit also
interferes with aircraft controls and instruments .

Pilot's Guide to Avionics 2014-2015

Table of Contents for the Digital Edition of Pilot's Guide to Avionics 2014-2015