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Rules and Regulations
Federal Register Vol. 86, No. 96
Thursday, May 20, 2021

This section of the FEDERAL REGISTER
contains regulatory documents having general applicability and legal effect, most of which are keyed to and codified in the Code of Federal Regulations, which is published under 50 titles pursuant to 44 U.S.C. 1510.
The Code of Federal Regulations is sold by the Superintendent of Documents.

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210370; Project Identifier MCAI202100477T; Amendment 3921568; AD 20211106
RIN 2120AA64

Airworthiness Directives; Airbus SAS
Airplanes Federal Aviation Administration FAA, DOT.
ACTION: Final rule; request for comments.
AGENCY:

The FAA is adopting a new airworthiness directive AD for all Airbus SAS Model A318, A319, A320, and A321 series airplanes. This AD was prompted by the loss of a windshield in flight, and the consequent rapid depressurization of the flight deck, which caused damage to flight deck items and systems and subsequent thermal shock and overheat, damage to windshield structural plies, and impaired structural integrity of the windshield. This AD requires repetitive inspections and electrical test measurements EMTs of affected windshields, and corrective actions if necessary, as specified in a European Union Aviation Safety Agency EASA
AD, which is incorporated by reference.
The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD becomes effective June 4, 2021.
The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD
as of June 4, 2021.
The FAA must receive comments on this AD by July 6, 2021.
ADDRESSES: You may send comments, using the procedures found in 14 CFR
11.43 and 11.45, by any of the following methods:
SUMMARY:

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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, 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 material incorporated by reference IBR in this AD, contact EASA, KonradAdenauer-Ufer 3, 50668 Cologne, Germany; telephone +49 221 8999 000;
email ADs@easa.europa.eu; internet www.easa.europa.eu. You may find this IBR material on the EASA website at https ad.easa.europa.eu. You may view this IBR material at the FAA, Airworthiness Products Section, 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 on the internet at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0370.
Examining the AD Docket You may examine the AD docket on the internet at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0370; 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, any comments received, and other information. The street address for Docket Operations is listed above.
FOR FURTHER INFORMATION CONTACT:
Sanjay Ralhan, Aerospace Engineer, Large Aircraft Section, International Validation Branch, FAA, 2200 South 216th St., Des Moines, WA 98198;
telephone and fax 2062313223; email Sanjay.Ralhan@faa.gov.
SUPPLEMENTARY INFORMATION:
Background EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD 20210111, dated April 22, 2021 EASA AD 2021
0111 also referred to as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe
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condition for all Airbus SAS Model A318, A319, and A321 series airplanes;
and Model A320211, 212, 214, 215, 216, 231, 232, 233, 251N, 252N, 253N, 271N, 272N, and 273N
airplanes. Model 320215 airplanes, which are included in the applicability of EASA AD, are not certificated by the FAA and are not included on the U.S.
type certificate data sheet; those airplanes are therefore not included in applicability of this AD.
This AD was prompted by the loss of the right windshield in flight on a Model A319 series airplane. The consequent rapid depressurization of the flight deck caused damage to flight deck items and systems and led to a significant increase in flightcrew workload. Investigations into the incident identified several contributing factors, including manufacturing variability, fretting between windshield components, water ingress, and corrosion of electrical braids. The subsequent thermal shock and overheat damaged more than one of the windshield structural plies and impaired the structural integrity of the windshield. Failure of the windshield could result in injury to the flightcrew and depressurization of the airplane, which could cause loss of control of the airplane. See the MCAI for additional background information.
Related Service Information Under 1
CFR Part 51
EASA AD 20210111 specifies procedures for repetitive detailed inspections of affected windshields for defects including delamination or bubbles on the windshield and signs of water ingress and corrosion damage of the windshield connector, EMTs dielectric and insulation tests of the windshields for potential wiring insulation damage and core degradation, and replacement of windshields that fail an inspection or EMT. EASA AD 2021
0111 also specifies reporting inspection and test results to Airbus. 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
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