Avionics News June 2019 - 17

FREQUENTLY ASKED
QUESTIONS: ADS-B

ADS-B equipment
installations for lightsport aircraft
The following information is from the Federal
Aviation Administration's ADS-B frequently asked
questions page on its website and FAA Advisory
Circular 91-114A CHG 1.
Question:
I operate an S-LSA aircraft. What should I install?

Answer:

Owners of standard light-sport aircraft do not need to
use certified equipment, but any alteration to install ADS-B
must be authorized by the aircraft manufacturer or a person
authorized by the FAA (see AC 90-114A). LSA owners may
alter their aircraft if they change their airworthiness certificate to an experimental certificate.
The following information has been extracted from FAA
Advisory Circular 91-114A CHG 1:
4-3. ADS-B Equipment Operations (U.S.-designated
airspace).
b. Equipment Qualification Requirements.
In order to operate an aircraft in airspace defined in §
91.225, the ADS-B Out equipment installed must meet
the performance requirements of the applicable ADS-B
TSOs and meet the requirements of § 91.227. Since
§ 91.225 requires the equipment to be installed, portable ADS-B Out equipment does not comply with the
rule. Under Part 21, installed equipment need not be
manufactured under a TSO authorization, but must be
approved or qualified according to the type of aircraft
as follows:
(2) Special Light-Sport Aircraft. Equipment
installed on S-LSA must be installed in accordance
with an applicable consensus standard and must be
authorized by the aircraft's manufacturer or a person
acceptable to the Federal Aviation Administration (see
§ 21.181).
(3) Experimental Aircraft, Including
Experimental Light-Sport Aircraft.
(a) For experimental category aircraft, including
E-LSA, there is no FAA approval required for the
ADS-B Out system installation. However, to protect
all users of the National Airspace System, it is essential
for all aircraft, including experimental and E-LSA, to

install equipment that has been adequately designed
and tested to meet the equipment's intended functions
of supporting safe air traffic control separation services and providing accurate traffic awareness to other
aircraft. To meet this requirement, owners of these
aircraft may elect to install equipment manufactured
under a TSO authorization, in accordance with the
installation instructions provided by the manufacturer.
Alternatively, owners of these aircraft may elect to
install equipment that are not approved under a TSO
authorization. For non-TSO equipment, the owner
should obtain installation instructions that include a
statement of compliance from the applicable avionics
manufacturer(s). To qualify non-TSO equipment as
compliant for operations in ADS-B airspace defined in
§ 91.225, the statement of compliance should indicate
that when installed in accordance with the installation
instructions, the equipment complies with all requirements of § 91.227, and with the performance requirements of the appropriate TSO. While the statement of
compliance is important in equipping the aircraft, per
§ 91.225, correct installation is critical for the equipment to operate properly.
(b) Manufacturers of equipment intended for installation in experimental aircraft and E-LSAs are responsible to perform appropriate engineering efforts to determine that the equipment complies with all § 91.227 and
TSO performance requirements before making their
statement of compliance. The FAA will not approve or
concur with manufacturers' statements of compliance
for this equipment. Manufacturers of this equipment
should also consider the guidance in AC 20-165 when
creating installation instructions. After making their
statement of compliance, manufacturers of experimental aircraft and E-LSA equipment should be prepared
to provide in-service product support to include design
changes, equipment modifications (or instructions for
performing them), and revisions to the installation,
operating, and maintenance instructions.
(c) Owners of experimental aircraft should retain the
installation instructions from the equipment supplier,
including the statement of compliance, in the aircraft
records to support the equipment's compliance with
the requirements of § 91.225 and § 91.227, and to assist
in resolving in-service issues if necessary.
Updates continued on following page

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Avionics News June 2019

Table of Contents for the Digital Edition of Avionics News June 2019

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Avionics News June 2019 - Intro
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Avionics News June 2019 - Cover2
Avionics News June 2019 - 1
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