Avionics News August 2019 - 19

FREQUENTLY ASKED
QUESTIONS: ADS-B

ADS-B Operations
The following information is from the
Federal Aviation Administration's Advisory
Circular 91-85B.
Question:
Can an aircraft operate in ADS-B airspace
with degradation in Global Positioning System?
Answer:
On July 3, 2019, the FAA announced its
policy on performance requirements for
certain operations of aircraft with Automatic
Dependent Surveillance-Broadcast Out
equipment in ADS-B airspace after Jan. 1,
2020. Under the circumstances identified in
this policy, the FAA is providing assurance
to operators that it will not consider
degradation in GPS performance due to
conditions outside the operator's control
that results in an operation falling below
ADS-B rule requirements to constitute
noncompliance, provided the operator has
exercised appropriate due diligence prior to
conducting an operation.
According to the policy summary:
After Jan. 1, 2020, unless otherwise
authorized by ATC, all aircraft
operating in the airspace identified in
§ 91.225 must comply with the ADS-B
Out performance requirements in §
91.227. As described above, however,
there are circumstances outside
of an operator's control that may
result in a temporary degradation of
GPS performance and an apparent
violation of § 91.227. An operator

may exercise due diligence in
performing a preflight availability
prediction for its intended route
of flight but experience rerouting
by ATC after obtaining an initial
ATC route clearance, which may
cause an unanticipated degradation
of performance. Additionally, an
operator may encounter actual
GPS interference on its intended
path of flight, which would affect
the ability of an aircraft to meet
the performance requirements of
§ 91.227. Lastly, an operator may
not be able to complete a preflight
availability prediction for its intended
route of flight due to the FAA's
Service Availability Prediction Tool
being out of service. As previously
explained, the FAA recognizes that
these situations are outside of the
operator's control. Therefore, the
FAA will not consider these events
to constitute noncompliance with
§ 91.227 due to the circumstances
discussed in this document to the
extent such an application would
impose a standard of conduct wholly
outside the operator's control.
Operators are encouraged to download
and become familiar with the entire policy
document prior to the Jan. 1, 2020, ADS-B
Out mandate. Visit www.govinfo.gov/content/
pkg/FR-2019-07-03/pdf/2019-14127.pdf. q

Updates continued on following page
avionics news

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august

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http://www.govinfo.gov/content/pkg/FR-2019-07-03/pdf/2019-14127.pdf http://www.govinfo.gov/content/pkg/FR-2019-07-03/pdf/2019-14127.pdf

Avionics News August 2019

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

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Avionics News August 2019 - Intro
Avionics News August 2019 - No label
Avionics News August 2019 - Cover2
Avionics News August 2019 - 1
Avionics News August 2019 - 2
Avionics News August 2019 - 3
Avionics News August 2019 - 4
Avionics News August 2019 - 5
Avionics News August 2019 - 6
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Avionics News August 2019 - Cover3
Avionics News August 2019 - Cover4
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