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54802

Federal Register / Vol. 86, No. 190 / Tuesday, October 5, 2021 / Rules and Regulations
of a certain publication listed in this AD
as of November 9, 2021.
For material incorporated by reference IBR in this AD, contact EASA, Konrad-Adenauer-Ufer 3, 50668
Cologne, Germany; telephone +49 221
8999 000; email ADs@easa.europa.eu;
internet www.easa.europa.eu. You may find this IBR material on the EASA
website at https ad.easa.europa.eu.
You may view this material at the FAA, Airworthiness Products Section, Operational Safety Branch, 2200 South 216th St., Des Moines, WA. For information on the availability of this material at the FAA, call 2062313195.
It is also available in the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210548.

ADDRESSES:

Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210548; or in person at Docket Operations between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this final rule, the mandatory continuing airworthiness information MCAI, any comments received, and other information. The address for Docket Operations is U.S. Department of Transportation, Docket Operations, M
30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT:

Shahram Daneshmandi, Aerospace Engineer, Large Aircraft Section, International Validation Branch, FAA, 2200 South 216th St., Des Moines, WA
98198; phone and fax: 2062313220;
email: shahram.daneshmandi@faa.gov.
SUPPLEMENTARY INFORMATION:

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 MCAI, to correct an unsafe condition for all ATRGIE Avions de Transport Regional Model ATR42500 and ATR72212A airplanes.
The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would apply to all ATRGIE Avions de Transport Regional Model ATR42500
and ATR72212A airplanes. The NPRM
published in the Federal Register on July 7, 2021 86 FR 35697. The NPRM
was prompted by reports indicating that Thales GPS SBAS receivers provided, under certain conditions, erroneous outputs on aircraft positions. The NPRM
proposed to require replacing affected GPS SBAS receivers with new, improved receivers, as specified in EASA AD 20210013.
The FAA is issuing 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. See the MCAI for additional background information.

adopted as proposed in the NPRM.
None of the changes will increase the economic burden on any operator.
Accordingly, the FAA is issuing this AD
to address the unsafe condition on these products.
Related AD
AD 20200802, Amendment 39
21108 85 FR 20586, April 14, 2020
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 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 AD 20190004 are effectively terminated for those airplanes.
Related Service Information Under 1
CFR Part 51

The FAA received a comment from the Air Line Pilots Association, International, ALPA who supported the NPRM without change.

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.

Conclusion
Costs of Compliance
The FAA reviewed the relevant data and determined that air safety requires adopting this AD as proposed. Except for minor editorial changes, this AD is
The FAA estimates that this AD
affects 15 airplanes of U.S. registry. The FAA estimates the following costs to comply with this AD:

Discussion of Final Airworthiness Directive Comments
ESTIMATED COSTS FOR REQUIRED ACTIONS
Labor cost
Parts cost
Cost per product
Cost on U.S.
operators
2 work-hours $85 per hour = $170

$0

$170

$2,550

The manufacturer will provide replacement receivers at no cost to the operators. The FAA has received no definitive data on which to base the cost estimates for these parts.

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Authority for This Rulemaking Title 49 of the United States Code specifies the FAAs authority to issue rules on aviation safety. Subtitle I, section 106, describes the authority of the FAA Administrator. Subtitle VII:
Aviation Programs, describes in more detail the scope of the Agencys authority.

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The FAA is issuing this rulemaking under the authority described in Subtitle VII, Part A, Subpart III, Section 44701: General requirements. Under that section, Congress charges the FAA
with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce.

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This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action.
Regulatory Findings This AD will not have federalism implications under Executive Order 13132. This AD will not have a
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