Avionics News September 2017 - 13

FREQUENTLY ASKED
QUESTIONS: ADS-B

Flight ID
The following information is from the
Federal Aviation Administration.

QUESTION:

What are the requirements for ADS-B Out
Flight ID?

ANSWER:

14 CFR 91.227(d)(8) states, "An indication of the
aircraft's call sign that is submitted on the flight plan,
or the aircraft's registration number, except when
the pilot has not filed a flight plan, has not requested
ATC services, and is using a TSO-C154c self-assigned
temporary 24-bit address."
FAA Advisory Circular 20-165B, paragraph 3.7.3.1
Call Sign/Flight ID states:
The assigned aircraft registration number
must be set as the call sign/flight ID during
installation. Procedures for dynamically selecting
a call sign must be included in the flight manual
or pilot's guide if the ADS-B equipment provides

vertical separation minimum airspace. The proposal
would eliminate the requirement for operators to apply
for an RVSM authorization when their aircraft are
equipped with qualified ADS-B Out systems and meet
specific altitude-keeping equipment requirements for
operations in RVSM airspace. This proposal recognizes
the enhancements in aircraft monitoring resulting from
the use of ADS-B Out systems, and responds to requests
to eliminate the burden and expense of the current RVSM
application process for operators of aircraft equipped
with qualified ADS-B Out systems.
Under this proposal, the requirement to submit
applications for RVSM authorization would no longer
be applied to operators of aircraft that are equipped with
qualified ADS-B Out systems and meet altitude-keeping

a means to input a radio telephony call sign. If
pilot-selectable, the call sign/flight ID should
be readily apparent to the flight crew. When
the aircraft system is powered on, the call sign/
flight ID must be filled. At initial power-on, it
is acceptable for the call sign/flight ID to revert
to a previously set call sign that existed before
the system being powered off, or to the aircraft
registration number.
Further, as reported in the regulatory update on
page 12, on Aug. 3, 2017, the FAA published a legal
interpretation regarding Flight ID that essentially
requires the aircraft Flight ID (either aircraft call
sign or aircraft registration number) to be accurate
to the aircraft's flight plan.
Therefore, if the aircraft operates or is likely to
operate with a dynamic call sign, the ADS-B Out
installation must be able to support pilot-entered
Flight ID in order to be rule compliant.

equipment performance requirements for operations in
RVSM airspace. According to the FAA, "by eliminating
this application requirement, the proposal would
reduce both operators' costs and FAA workload, while
maintaining the existing level of safety." Additionally,
since RVSM airspace has been implemented worldwide,
the proposal would remove the detailed designations
where RVSM may be applied that are currently found in
Appendix G of Part 91.
More information can be found at: https://www.gpo.
gov/fdsys/pkg/FR-2017-08-07/pdf/2017-16197.pdf.
Comments must be submitted no later than
Sept. 6, 2017.
Continued on following page

avionics news

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september

2017

13
https://www.gpo.gov/fdsys/pkg/FR-2017-08-07/pdf/2017-16197.pdf https://www.gpo.gov/fdsys/pkg/FR-2017-08-07/pdf/2017-16197.pdf
Table of Contents for the Digital Edition of Avionics News September 2017
