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Federal Register / Vol. 86, No. 234 / Thursday, December 9, 2021 / Rules and Regulations
Renewed Amendment Number 1 on February 22, 2022.
SAR Submitted by: Transnuclear, Inc., now TN Americas LLC.
Renewal SAR Submitted by: TN
Americas LLC.
SAR Title: Final Safety Analysis Report for the TN68 Dry Storage Cask.
Docket Number: 721027.
Certificate Expiration Date: May 28, 2020.
Renewed Certificate Expiration Date:
May 28, 2060.
Model Number: TN68.

Dated: November 29, 2021.
For the Nuclear Regulatory Commission.
Daniel H. Dorman, Executive Director for Operations.

Examining the AD Docket
FR Doc. 202126628 Filed 12821; 8:45 am BILLING CODE 759001P

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210953; Project Identifier AD202101169T; Amendment 3921810; AD 20212312
RIN 2120AA64

Airworthiness Directives; Transport and Commuter Category Airplanes Federal Aviation Administration FAA, DOT.
ACTION: Final rule; request for comments.
AGENCY:

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You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210953; 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, any comments received, and other information. The street address for the Docket Operations is listed above.
FOR FURTHER INFORMATION CONTACT:
Brett Portwood, Continued Operational Safety Technical Advisor, COS Program Management Section, Operational Safety Branch, FAA, 3960 Paramount Boulevard, Lakewood, CA 907124137;
phone: 8172225390; email:
operationalsafety@faa.gov.
SUPPLEMENTARY INFORMATION:
Background
The FAA is adopting a new airworthiness directive AD for all transport and commuter category airplanes equipped with a radio also known as radar altimeter. This AD was prompted by a determination that radio altimeters cannot be relied upon to perform their intended function if they experience interference from wireless broadband operations in the 3.73.98
GHz frequency band 5G C-Band. This AD requires revising the limitations section of the existing airplane/aircraft flight manual AFM to incorporate limitations prohibiting certain operations requiring radio altimeter data when in the presence of 5G C-Band interference as identified by Notices to Air Missions NOTAMs. The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective December 9, 2021.
The FAA must receive comments on this AD by January 24, 2022.
ADDRESSES: You may send comments, using the procedures found in 14 CFR
SUMMARY:

11.43 and 11.45, by any of the following methods:
Federal eRulemaking Portal: Go to https www.regulations.gov. Follow the instructions for submitting comments.
Fax: 2024932251.
Mail: U.S. Department of Transportation, Docket Operations, M
30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
Hand Delivery: Deliver to Mail address above between 9 a.m. and 5
p.m., Monday through Friday, except Federal holidays.

In March 2020, the United States Federal Communications Commission FCC adopted final rules authorizing flexible use of the 3.73.98 GHz band for next generation services, including 5G and other advanced spectrum-based services.1 Pursuant to these rules, CBand wireless broadband deployment is permitted to occur in phases with the opportunity for operations in the lower 100 megahertz of the band 3.73.8 GHz in 46 markets beginning as soon as December 5, 2021; however, the FAA
does not expect actual deployment to commence until January 5, 2022. This AD refers to 5G C-Band interference, but wireless broadband technologies, other than 5G, may use the same frequency band.2 These other uses of the same frequency band are within the scope of this AD since they would introduce the same risk of radio altimeter interference as 5G C-Band.
1 The FCCs rules did not make C-Band wireless broadband available in Alaska, Hawaii, and the U.S.
Territories.
2 The regulatory text of the AD uses the term 5G
C-Band which, for purposes of this AD, has the same meaning as 5G, C-Band and 3.73.98
GHz
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In April 2020, RTCA formed a 5G
Task Force, including members from RTCA, the FAA, aircraft and radio altimeter manufacturers, European Organisation for Civil Aviation Equipment EUROCAE, industry organizations, and operators, to perform a quantitative evaluation of radar altimeter performance regarding RF
interference from expected 5G
emissions in the 3.73.98 GHz band, as well as a detailed assessment of the risk of such interference occurring and impacting aviation safety. 3 Based on the work of the task force, RTCA
published a report which concludes that there is a major risk that 5G
telecommunications systems in the 3.7
3.98 GHz band will cause harmful interference to radar altimeters on all types of civil aircraftincluding commercial transport airplanes;
business, regional, and general aviation airplanes; and both transport and general aviation helicopters. 4
The report further concludes that the likelihood and severity of radio frequency interference increases for operations at lower altitudes. That interference could cause the radio altimeter to either become inoperable or present misleading information, and/or also affect associated systems on civil aircraft. The RTCA report refers to FCC
Report and Order R&O FCC 2022,5
which identifies radio frequencies and power level conditions for the new CBand services. The RTCA report identified the possibility of interference from both wireless emitters on base stations, for example as well as onboard user handsets. The RTCA report and conclusions remain under review, including by federal spectrum regulators. The FAA risk assessment included consideration of the RTCA
report, public comments to the RTCA
report, and analyses from radio altimeter manufacturers and aircraft manufacturers in support of the safety risk determination. The analyses FAA
considered were consistent with RTCAs conclusions pertaining to radio altimeter interference from C-Band 3 RTCA Paper No. 27420/PMC2073, Assessment of C-Band Mobile Telecommunications Interference Impact on Low Range Radar Altimeter Options, dated October 7, 2020 RTCA Paper No.
27420/PMC2073, page i. This document is available in Docket No. FAA20210953, and at https www.rtca.org/wp-content/uploads/2020/10/
SC-239-5G-Interference-Assessment-Report_274-20PMC-2073_accepted_changes.pdf.
4 RTCA Paper No. 27420/PMC2073, page i.
5 FCC Report and Order R&O FCC 2022 in the Matter of Expanding Flexible Use of the 3.74.2
GHz Band, adopted February 28, 2020, and released March 3, 2020. This document is available in Docket No. FAA20210953, and at https
www.fcc.gov/document/fcc-expands-flexible-use-cband-5g-0.

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