Avionics News June 2018 - 19

FREQUENTLY ASKED
QUESTIONS: ADS-B

Choosing equipment with
changeable call signs
The following information is from the Federal
Aviation Administration NextGen website.

Question: Should the operator purchase an
ADS-B transmitter that allows them to enter a call
sign?
Answer: The following is from the FAA's
website:
ADS-B transmitters may be purchased with or without
the pilot changeable call sign feature. Most general
aviation pilots use their aircraft registration (N number)
as the call sign for ATC communications and filing flight
plans. Commercial operators routinely use call signs
that are not related to the aircraft registration but relate
to the activity of the operation (United, Delta American,
etc.). 14 CFR 91.227(d)(8) specifically addresses call sign
requirements.
If you always use your plane's registration number
for air traffic control communication, you can use an
ADS-B transmitter with a non-changeable call sign. If

Out alterations. On Form 337, Block 8, include
the following compliance statement, "The
installed ADS-B Out system was shown to meet
the equipment performance requirements of 14
CFR section 91.227 along with the applicable
ADS-B Out transmitter and GPS make/model
information. Submit the completed Form 337 to
the Aircraft Registration Branch, AFS-750, P.O.
Box 25504, Oklahoma City, Oklahoma 73125.
The Form 337 can be submitted directly without
FAA approval in Block 3.
In addition to the question of a major alteration, there
was also a question about a flight manual supplement.
Again, the following is from the FAA's memorandum:
Does installation of an ADS-B Out system

you're not sure, use the questions below to determine
what kind of equipment you need.
If you answer yes to any of the questions below, you
need an ADS-B transmitter with a pilot-changeable call
sign feature.
*	 Do you use an ICAO call sign to communicate
with air traffic control (e.g. DAL123)?
*	 Do you use a local area call sign to communicate
with air traffic control (e.g. RDDL123)?
*	 Do you conduct commercial air taxi flights using
a Tango November prefix for your ATC call sign?
*	 Do you conduct emergency medical
transportation flights using a Lima November
prefix for your ATC call sign?
*	 Do you conduct volunteer flights for
organizations such as Angel Flight or Animal
Rescue Flight and prefer to use their ICAO call
sign (e.g. ARF223)?
*	 Does your flight planning company provide a
unique call sign for privacy reasons? q

require revision of the Aircraft Flight Manual?
Yes, following installation of a compliant
ADS-B Out system, the general section of the
AFM must be revised to include the following
statement. "The installed ADS-B Out system has
been shown to meet the equipment performance
requirements of 14 CFR 91.227." Applicable
AFM revisions do not require FAA approval.
If you are installing ADS-B Out systems, you
are encouraged to read and be familiar with the
FAA Installation Approval for ADS-B Out Systems
memorandum as well as the companion technical
paper. Both documents are available on the FAA's
website at www.faa.gov/nextgen/equipadsb/
installation.
Continued on following page

avionics news

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june

2018

19


http://www.faa.gov/nextgen/equipadsb/

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