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Federal Register / Vol. 86, No. 172 / Thursday, September 9, 2021 / Proposed Rules
Federal eRulemaking Portal: Go to https www.regulations.gov. Follow the instructions for submitting comments.
Fax: 202 4932251.
Mail: U.S. Department of Transportation, Docket Operations, M30, 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.
For service information identified in this NPRM, contact Phenom Maintenance Support, Avenida Brigadeiro Faria Lima, 2170, P.O. Box 36/2, Sao Jose dos Campos, 12227901, Brazil; phone: +55 12 3927 1000; email:
phenom.reliability@embraer.com.br;
website: https www.embraer.com.br/
en-US/Pages/home.aspx. You may view this service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 901 Locust, Kansas City, MO 64106. For information on the availability of this material at the FAA, call 816 3294148.

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Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20201073; 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 NPRM, the MCAI, any comments received, and other information. The street address for Docket Operations is listed above.
FOR FURTHER INFORMATION CONTACT: Jim Rutherford, Aviation Safety Engineer, General Aviation & Rotorcraft Section, International Validation Branch, 901
Locust, Room 301, Kansas City, MO
64106; phone: 816 3294165; fax: 816
3294090; email: jim.rutherford@
faa.gov.
SUPPLEMENTARY INFORMATION:
Comments Invited The FAA invites you to send any written relevant data, views, or arguments about this proposal. Send your comments to an address listed under ADDRESSES. Include Docket No.
FAA20201073; Project Identifier MCAI202001303A at the beginning of your comments. The most helpful comments reference a specific portion of the proposal, 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 the proposal because of those comments.
Except for Confidential Business Information CBI as described in the
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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 proposed AD.
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 NPRM
contain commercial or financial information that is customarily treated as private, that you actually treat as private, and that is relevant or responsive to this NPRM, 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 NPRM. Submissions containing CBI
should be sent to Jim Rutherford, Aviation Safety Engineer, General Aviation & Rotorcraft Section, International Validation Branch, 901
Locust, Room 301, Kansas City, MO
64106. 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 FAA issued AD 20201208, Amendment 3921143 85 FR 36312, June 16, 2020 AD 20201208, for Embraer S.A. type certificate previously held by Empresa Brasileira de Aeronautica S.A. Model EMB505
airplanes, all serial numbers. AD 2020
1208 was prompted by reports of corrosion in the mass-balance weights of the flight control surfaces and a determination that new airworthiness limitations are necessary. AD 202012
08 was based on mandatory continuing airworthiness information MCAI
issued by the Agencia Nacional de Aviacao Civil ANAC, which is the aviation authority for Brazil. ANAC
issued Brazilian Emergency AD No.
20200101, dated January 9, 2020, to address the unsafe condition on all Embraer S.A. Model EMB505
airplanes.
AD 20201208 requires, for certain serial-numbered airplanes, inspecting the mass-balance weights of the flight control surfaces and their attachment
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parts for corrosion and fragmentation, and corrective actions if necessary, including sending inspection results to Embraer. For all airplanes, AD 202012
08 requires revising the airworthiness limitation section of the maintenance manual or instructions for continued airworthiness to incorporate new airworthiness limitations.
The FAA issued AD 20201208 to address corrosion in the mass-balance weights of the flight control surfaces.
The unsafe condition, if not addressed, could result in loss of mass or the detachment of the mass-balance weights, resulting in an unbalanced control surface, which could lead to flutter and loss of airplane control.
Actions Since AD 20201208 Was Issued Since the FAA issued AD 202012
08, ANAC superseded Brazilian Emergency AD No. 20200101, dated January 9, 2020, and issued Brazilian AD No. 20200901, dated September 8, 2020 referred to after this as the MCAI. The MCAI states:
It has been found the occurrence of corrosion in the mass-balance weights of the control surfaces. The corrosion may lead to loss of mass or detachment of the massbalance weights, resulting in an unbalance control surface, which, in conjunction with certain flight conditions, could lead to flutter and possible loss of airplane control.
Since this condition may occur in other airplanes of the same type and affects flight safety, a corrective action is required. Thus, sufficient reason exists to request compliance with this ANAC AD in the indicated time limit.
After ANAC EAD 20200101 was released, a reassessment of the unsafe condition by Embraer and, subsequently, the SB 505550004, revisions 0 and 1, dated March 25th, 2020 and June 24, 2020, respectively, expanding the list of affected aircraft serial numbers S/Ns as well as inserting more restrictive criteria to determine the replacement of affected P/Ns.
Therefore, this ANAC AD retains the requirements of ANAC EAD 20200101, which is superseded, and incorporates new applicable aircraft S/Ns and new criteria for the replacement of affected P/Ns.

You may examine the MCAI at https www.regulations.gov by searching for and locating Docket No.
FAA20201073.
Comments on AD 20201208
The FAA issued AD 20201208 as a final rule; request for comments. The FAA received comments on AD 2020
1208 from Flexjet LLC Flexjet, an individual, and two anonymous commenters.
Flexjet and an anonymous commenter requested that AD 20201208 allow credit for previous actions using
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