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Federal Register / Vol. 86, No. 127 / Wednesday, July 7, 2021 / Proposed Rules
Validation Branch, FAA, 2200 South 216th St., Des Moines, WA 98198;
phone and fax: 2062313220; email:
shahram.daneshmandi@faa.gov. Any commentary that the FAA receives which is not specifically designated as CBI will be placed in the public docket for this rulemaking.
Background EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD 20210013, dated January 13, 2021 EASA AD
20210013 also referred to as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe condition for all ATRGIE
Avions de Transport Regional Model ATR42500 and ATR72212A
airplanes.
This proposed AD was prompted by reports indicating that Thales GPS
SBAS receivers provided, under certain conditions, erroneous outputs on aircraft positions. The manufacturer developed a new, improved receiver which incorporates improved software and ensures correct navigational performance. The FAA is proposing this AD to address erroneous aircraft position outputs from the GPS SBAS
receivers, which could result in controlled flight into terrain, and consequent loss of control of the airplane.
Although paragraphs 2 and 3 of EASA AD 20210013 require amending the applicable AFM, the FAA has determined that this requirement is not necessary. The FAA received verification from the manufacturer that the unsafe condition in this proposed AD will be addressed by replacing the GPS SBAS receivers with new, improved receivers. However, the GPS
procedures added to the AFM as required by AD 20200802, Amendment 3921108 85 FR 20586, April 14, 2020 AD 20200802, must be removed, as specified in paragraph h2 of this proposed AD.
See the MCAI for additional background information.

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Related AD
AD 20200802 applies to certain Thales GPS SBAS receivers installed on airplanes including Model ATR42500
and ATR72212A and helicopters. AD
20200802 requires the installation of a software update to the aircraft navigation database and insertion of a
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change to the applicable airplane flight manual AFM. The FAA issued AD
20200802 to address erroneous aircraft position outputs from the affected Thales GPS SBAS receivers, which could result in controlled flight into terrain and loss of the aircraft. AD
20200802 corresponds to EASA AD
20190004, dated January 11, 2019.
Upon completion of EASA AD 2021
0013 by Model ATR42500 and ATR72
212A airplanes, all requirements of EASA 20190004 are effectively terminated for those airplanes.
Related Service Information Under 1
CFR Part 51
EASA AD 20210013 describes procedures for replacing certain GPS
SBAS receivers with new, improved receivers. This material is reasonably available because the interested parties have access to it through their normal course of business or by the means identified in the ADDRESSES section.
FAAs Determination and Requirements of This Proposed AD
This product has been approved by the aviation authority of another country, and is approved for operation in the United States. Pursuant to the FAAs bilateral agreement with the State of Design Authority, the FAA has been notified of the unsafe condition described in the MCAI referenced above. The FAA is proposing this AD
because the FAA evaluated all the relevant information and determined the unsafe condition described previously is likely to exist or develop in other products of the same type design.
Proposed AD Requirements This proposed AD would require accomplishing the actions specified in EASA AD 20210013 described previously, as incorporated by reference, except for any differences identified as exceptions in the regulatory text of this AD, and except as discussed under Difference Between this Proposed AD and the MCAI.
Accomplishment of the requirements of this AD would terminate all requirements of AD 20200802 for Model ATR42500 and ATR72212A
airplanes.
Difference Between This Proposed AD
and the MCAI
Although certain service information specified in EASA AD 20210013

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specifies the inclusion of MOD 10046 in the AFM List of Modifications LOM, this proposed AD does not include this requirement. Instead, after accomplishment of the actions in this proposed AD, operators would be required to remove the AFM revisions for the GPS reset procedures that are required by FAA AD 20200802, because the unsafe condition in this proposed AD will be addressed by the GPS SBAS receiver replacement. This difference has been coordinated with ATR and EASA.
Explanation of Required Compliance Information In the FAAs ongoing efforts to improve the efficiency of the AD
process, the FAA initially worked with Airbus and EASA to develop a process to use certain EASA ADs as the primary source of information for compliance with requirements for corresponding FAA ADs. The FAA has since coordinated with other manufacturers and civil aviation authorities CAAs to use this process. As a result, EASA AD
20210013 will be incorporated by reference in the FAA final rule. This proposed AD would, therefore, require compliance with EASA AD 20210013
in its entirety, through that incorporation, except for any differences identified as exceptions in the regulatory text of this proposed AD.
Using common terms that are the same as the heading of a particular section in the EASA AD does not mean that operators need comply only with that section. For example, where the AD
requirement refers to all required actions and compliance times, compliance with this AD requirement is not limited to the section titled Required Actions and Compliance Times in the EASA AD. Service information specified in EASA AD
20210013 that is required for compliance with EASA AD 20210013
will be available on the internet at https www.regulations.gov by searching for and locating Docket No.
FAA20210548 after the FAA final rule is published.
Costs of Compliance The FAA estimates that this proposed AD affects 15 airplanes of U.S. registry.
The FAA estimates the following costs to comply with this proposed AD:

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