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Federal Register / Vol. 86, No. 218 / Tuesday, November 16, 2021 / Proposed Rules
lotter on DSK11XQN23PROD with PROPOSALS1

as PROPIN. The FAA will treat such marked submissions as confidential under the FOIA, and they will not be placed in the public docket of this NPRM. Submissions containing CBI
should be sent to Nicholas Rediess, Aviation Safety Engineer, Boston ACO
Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone: 781
2387159; fax: 781 2387199; email:
nicholas.rediess@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 The European Aviation Safety Agency now European Union Aviation Safety Agency EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD
20190004, dated January 11, 2019, and corrected on January 17, 2019 EASA
AD 20190004, to correct an unsafe condition for Thales AVS France SAS
Thales, formerly Thales Avionics SAS, GPS/SBAS receivers, Topstar 200 LPV, part number P/N C17149HA01 and C17149JA02, using SBAS, which are known to be installed on, but not limited to, certain Model ATR 42500
and ATR 72212A aeroplanes and Sikorsky Model S76D helicopters.
EASA advises of reports indicating that Thales GPS SBAS receivers provided, under certain conditions, erroneous outputs on aircraft positions. EASA AD
20190004 requires actions to prevent compromise of the safety margins when the receiver is used for Localizer Performance with Vertical guidance LPV and/or RNPAR Required Navigation PerformanceAuthorization Required operations. Following the issuance of EASA AD 20190004, the FAA issued AD 20200802, Amendment 3921108 85 FR 20586, April 14, 2020, to address the unsafe condition on these products.
After the issuance of EASA AD 2019
0004, EASA issued related EASA AD
20210013, dated January 13, 2021
EASA AD 20210013, in response to a software update that was developed to ensure correct navigational performance of certain Thales GPS SBAS receivers installed on ATRGIE Avions de Transport Regional, formerly EADS
ATRAlenia, Aerospatiale Matra ATRALENIA, AerospatialeAlenia, AerospatialeAeritalia, Model ATR 42
500 and ATR 72212A aeroplanes.
This proposed AD would require replacing affected GPS TopStar 200 LPV
receivers installed on Sikorsky Aircraft Corporation Model S76D helicopters.
The FAA is proposing this AD to address erroneous aircraft position
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outputs from the GPS SBAS receivers, which could result in controlled flight into terrain, and subsequent loss of control of the helicopter.
FAAs Determination The FAA is issuing this NPRM after determining that the unsafe condition described previously is likely to exist or develop on other products of the same type design.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Sikorsky S76D
Helicopter Service Bulletin SB 76017, Basic Issue, dated May 11, 2021 SB 76
017. SB 76017 specifies procedures for removing, updating, and installing GPS
TopStar 200 LPV receivers. SB 76017
also provides instructions for sending the GPS receivers to Thales Authorized Repair Stations for the software update.
This service information 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.
Proposed AD Requirements in This NPRM
This proposed AD would require replacing each affected GPS receiver and prohibit installing an affected GPS
receiver on any helicopter.
Differences Between This Proposed AD
and the Service Information SB 76017 requires returning the GPS
receivers to Thales Authorized Repair Stations for the software update, while this proposed AD would require replacing the GPS receivers instead.
Costs of Compliance The FAA estimates that this proposed AD would affect 22 helicopters of U.S.
Registry and that operators may incur the following costs in order to comply with this proposed AD. Labor costs are estimated at $85 per work-hour.
Replacing a GPS receiver would take about 3 work-hours and parts would cost about $7,400, for an estimated cost of $7,655 per GPS receiver and $336,820
for the U.S. fleet.
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.
The FAA is issuing this rulemaking under the authority described in
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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.
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 The FAA determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would not have a substantial direct effect on the States, on the relationship between the national government and the States, or on the distribution of power and responsibilities among the various levels of government.
For the reasons discussed above, I
certify this proposed regulation:
1 Is not a significant regulatory action under Executive Order 12866, 2 Would not affect intrastate aviation in Alaska, and 3 Would not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.
The Proposed Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 14 CFR part 39 as follows:
PART 39AIRWORTHINESS
DIRECTIVES
1. The authority citation for part 39
continues to read as follows:

Authority: 49 U.S.C. 106g, 40113, 44701.
39.13

Amended
2. The FAA amends 39.13 by adding the following new airworthiness directive:

Sikorsky Aircraft Corporation: Docket No.
FAA20211002; Project Identifier AD
202100332R.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD by January 3, 2022.

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