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Federal Register / Vol. 86, No. 234 / Thursday, December 9, 2021 / Rules and Regulations b Affected ADs None.
c Applicability This AD applies to all transport and commuter category airplanes equipped with a radio also known as radar altimeter. These radio altimeters are installed on various transport and commuter category airplanes including, but not limited to, the airplanes for which the design approval holder is identified in paragraphs c1 through 19 of this AD.
1 The Boeing Company 2 Airbus SAS
3 Bombardier Inc.
4 Embraer S.A.
5 Gulfstream Aerospace Corporation 6 Gulfstream Aerospace LP
7 Textron Aviation Inc.
8 Pilatus Aircraft Limited
9 Fokker Services B.V.
10 Saab AB, Support and Services 11 DeHavilland Aircraft of Canada Limited 12 Airbus Canada Limited Partnership 13 ATRGIE Avions de Transport Regional 14 Yabora Industria Aeronautica S.A.
15 MHI RJ Aviation ULC
16 BAE Systems Operations Limited 17 Lockheed Martin Corporation/Lockheed Martin Aeronautics Company 18 Viking Air Limited 19 Dassault Aviation d Subject Air Transport Association ATA of America Code 31, Indicating/Recording System; 34, Navigation.
e Unsafe Condition This AD was prompted by a determination that radio altimeters cannot be relied upon to perform their intended function if they
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experience interference from wireless broadband operations in the 3.73.98 GHz frequency band 5G C-Band. The FAA is issuing this AD because radio altimeter anomalies that are undetected by the automation or pilot, particularly close to the ground e.g., landing flare, could lead to loss of continued safe flight and landing.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Airplane/Aircraft Flight Manual AFM
Revision On or before January 4, 2022: Revise the Limitations Section of the existing AFM by incorporating the limitations specified in figure 1 to paragraph g of this AD. This may be done by inserting a copy of this AD into the existing AFM.

Figure 1 to paragraph g -AFM Revision Required by AD 2021-23-12
Radio Altimeter Flight Restrictions When operating in U.S. airspace, the following operations requiring radio altimeter are prohibited in the presence of 5G C-Band wireless broadband interference as identified by NOTAM NOTAMs will be issued to state the specific airports where the radio altimeter is unreliable due to the presence of 5G C-Band wireless broadband interference:
Instrument Landing System ILS Instrument Approach Procedures IAP SA
CAT I, SA CAT II, CAT II, and CAT III
Required Navigation Performance RNP Procedures with Authorization Required AR, RNP AR IAP
Automatic Landing operations Manual Flight Control Guidance System operations to landing/head-up display HUD to touchdown operation Use of Enhanced Flight Vision System EFVS to touchdown under 14 CFR
91.176a i Related Information
1 The Manager, Operational Safety Branch, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. In accordance with 14 CFR 39.19, send your request to your principal inspector or responsible Flight Standards Office, as appropriate. If sending information directly to the manager of the Operational Safety Branch, send it to the attention of the person identified in paragraph i of this AD.
Information may be emailed to: AMOC@
faa.gov.
2 Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the responsible Flight Standards Office.

DEPARTMENT OF TRANSPORTATION

For more information about this AD, 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.
j Material Incorporated by Reference None.
Issued on December 7, 2021.
Gaetano A. Sciortino, Deputy Director for Strategic Initiatives, Compliance & Airworthiness Division, Aircraft Certification Service.
FR Doc. 202126777 Filed 12721; 2:00 pm BILLING CODE 491013P

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Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210879; Project Identifier MCAI202001494E; Amendment 3921773; AD 20212113
RIN 2120AA64

Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG Type Certificate Previously Held by RollsRoyce plc Turbofan Engines Republication Editorial Note: Rule document 202125005
was originally published on pages 64066
through 64068 in the issue of Wednesday,
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h Alternative Methods of Compliance AMOCs