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Federal Register / Vol. 86, No. 221 / Friday, November 19, 2021 / Rules and Regulations
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 under Docket No. FAA20210880.
Examining the AD Docket You may examine the AD docket at https www.regulations.gov under Docket No. FAA20210880; 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 AD, the mandatory continuing airworthiness information MCAI, any comments received, and other information. The street address for Docket Operations is listed above.
FOR FURTHER INFORMATION CONTACT:
Antariksh Shetty, Aerospace Engineer, Airframe and Propulsion Section, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY
11590; telephone 5162287300; fax 5167945531; email 9-avs-nyaco-cos@
faa.gov.
SUPPLEMENTARY INFORMATION:

Comments Invited The FAA invites you to send any written data, views, or arguments about this final rule. Send your comments to an address listed under ADDRESSES.
Include Docket No. FAA20210880;
Project Identifier MCAI202100685T
at the beginning of your comments. The most helpful comments reference a specific portion of the final rule, explain the reason for any recommended change, and include supporting data.
The FAA will consider all comments received by the closing date and may amend this final rule because of those comments.
Except for Confidential Business Information CBI as described in the following paragraph, and other information as described in 14 CFR
11.35, the FAA will post all comments received, without change, to https
www.regulations.gov, including any personal information you provide. The agency will also post a report summarizing each substantive verbal contact received about this final rule.

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Confidential Business Information CBI is commercial or financial information that is both customarily and actually treated as private by its owner.
Under the Freedom of Information Act FOIA 5 U.S.C. 552, CBI is exempt from public disclosure. If your comments responsive to this AD contain commercial or financial information that is customarily treated as private,
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that you actually treat as private, and that is relevant or responsive to this AD, it is important that you clearly designate the submitted comments as CBI. Please mark each page of your submission containing CBI 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 AD. Submissions containing CBI
should be sent to Antariksh Shetty, Aerospace Engineer, Airframe and Propulsion Section, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590;
telephone 5162287300; fax 516794
5531; email 9-avs-nyaco-cos@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 20210138, dated June 9, 2021 EASA AD 2021
0138 also referred to as the MCAI, to correct an unsafe condition for certain The Boeing Company Model 747400F
series airplanes.
This AD was prompted by the determination that more restrictive tasks and limitations are necessary.
EASA approved supplemental type certificate STC 10068342, dated January 16, 2019, which installs a dual non-activated global navigation satellite system GNSS unit and antenna on The Boeing Company Model 747400F
series airplanes. EASA STC 10068342
was validated by the FAA as STC
ST04393NY, dated September 3, 2019.
After EASA approved the original STC, Fokker Services published an updated Instructions for Continued Airworthiness ICA supplement that introduced more restrictive tasks. The STC was later amended and approved by EASA as STC 10068342, Revision 1, dated March 8, 2021, and validated by the FAA as STC ST04393NY, Revision 1, dated May 3, 2021. The amended STC
incorporates the updated ICA
supplement. As a result, operation of an affected airplane with the original STC
but without the ICA supplement could result in cracks around the antenna/unit installation.
The FAA is issuing this AD to address cracks around the antenna/unit installation, which, if unchecked, could lead to rapid decompression of the airplane. See the MCAI for additional background information.

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Related Service Information Under 1
CFR Part 51
EASA AD 20210138 describes more restrictive tasks and limitations associated with the GNSS unit and antenna. 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 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 this State of Design Authority, it has notified the FAA of the unsafe condition described in the MCAI described above. The FAA
is issuing this AD after determining that the unsafe condition described previously is likely to exist or develop on other products of the same type designs.
Requirements of This AD
This AD requires accomplishing the actions specified in EASA AD 2021
0138 described previously, except for any differences identified as exceptions in the regulatory text of this AD, and except as discussed under Differences Between this AD and the MCAI.
This AD requires revisions to certain operator maintenance documents to include new actions e.g., inspections.
Compliance with these actions is required by 14 CFR 91.403c. For airplanes that have been previously modified, altered, or repaired in the areas addressed by this AD, the operator may not be able to accomplish the actions described in the revisions. In this situation, to comply with 14 CFR
91.403c, the operator must request approval for an alternative method of compliance according to paragraph j1
of this AD.
Explanation of Required Compliance Information In the FAAs ongoing efforts to improve the efficiency of the AD
process, the FAA developed a process to use some civil aviation authority CAA
ADs as the primary source of information for compliance with requirements for corresponding FAA
ADs. The FAA has been coordinating this process with manufacturers and CAAs. As a result, EASA AD 20210138
is incorporated by reference in this AD.
This AD requires compliance with EASA AD 20210138 in its entirety through that incorporation, except for any differences identified as exceptions in the regulatory text of this AD. Using common terms that are the same as the
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