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Federal Register / Vol. 86, No. 124 / Thursday, July 1, 2021 / Rules and Regulations
and locating Docket No. FAA2021
0540.
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
0540; 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:

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Background EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD 20210150, dated June 21, 2021; corrected June 25, 2021 EASA AD 20210150 also referred to as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe condition for all Airbus SAS Model A319151N, A319153N, A319171N, A320251N, A320252N, A320253N, A320271N, A320272N, A320273N, A321251N, A321251NX, A321252N, A321
252NX, A321253N, A321253NX, A321271N, A321271NX, A321272N
and A321272NX airplanes.
EASA and Airbus issued various communication documents respectively EASA Safety Information Bulletin SIB 202014, Airbus Operators Information Transmission OIT 999.0048/20, Airbus Operational Training Transmission OTT 999.0025/
21, and Airbus Flight Operations Transmission FOT 999.0020/21 to remind operators to apply appropriate procedures for returning airplanes to service from short term or long term storage/parking, including procedures to inspect the pitot static system. However, an increasing number of operational disruptions have been reported, due to contaminated air data system, caused by lack of application of appropriate maintenance procedures for returning airplanes to service.
This AD was prompted by reports of an increasing number of operational disruptions due to airspeed discrepancies after airplanes have been parked or stored a large number of airplanes have been parked or stored due to the COVID19 pandemic.

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Consistent erroneous airspeed indications which stands for 2 or 3
pitot probes delivering erroneous speed information within the same speed range may adversely affect airplane response, in particular during the rotation phase. The FAA is issuing this AD to address airspeed discrepancies, which could lead to an unstable flight path after take-off, possibly resulting in reduced control of the airplane. See the MCAI for additional background information.
Related Service Information Under 1
CFR Part 51
EASA AD 20210150 describes procedures for, among other actions, revising the AFM to include a procedure to reinforce the airspeed check during the take-off phase and provide instructions to abort take-off in certain cases e.g., an unreliable airspeed situation or certain airspeed differences.
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 the State of Design Authority, the FAA has been notified of the unsafe condition described in the MCAI referenced above. The FAA is issuing this AD
because the FAA evaluated all pertinent information and determined the unsafe condition exists and is likely to exist or develop on other products of the same type design.
Requirements of This AD
This AD requires accomplishing the actions specified in EASA AD 2021
0150 described previously, as incorporated by reference, 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.
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 20210150

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is incorporated by reference in this AD.
This AD requires compliance with EASA AD 20210150 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 heading of a particular section in EASA
AD 20210150 does not mean that operators need comply only with that section. For example, where the AD
requirement refers to all required actions and compliance times, compliance with this AD requirement is not limited to the section titled Required Actions and Compliance Times in EASA AD 20210150.
Service information required by EASA
AD 20210150 for compliance will be available at https www.regulations.gov by searching for and locating Docket No.
FAA20210540 after this AD is published.
Differences Between This AD and the MCAI
Paragraph 3 of EASA AD 20210150
requires revising the minimum equipment list MEL to incorporate an EASA master minimum equipment list MMEL change to mandate that the integrated standby instrument system ISIS airspeed indication must be operative. However, the FAA MMEL
does not provide relief for an inoperative ISIS airspeed indication function. Therefore, paragraph 3 of EASA AD 20210150 is unnecessary for this AD.
EASA AD 20210150 requires operators to inform all flight crews of revisions to the AFM and thereafter to operate the aeroplane accordingly.
However, this AD does not specifically require those actions as those actions are already required by FAA
regulations.
FAA regulations require operators furnish to pilots any changes to the AFM ex: 14 CFR 121.137, and to ensure the pilots are familiar with the AFM ex: 14 CFR 91.505. As with any other training requirement, training on the updated AFM content is tracked by the operators and recorded in each pilots training record, which is available for the FAA to review. FAA
regulations also require pilots to follow the procedures in the existing AFM
including all updates. 14 CFR 91.9
requires that no person may operate a civil aircraft without complying with the operating limitations specified in the AFM.
Therefore, including a requirement in this AD to operate the airplane according to the revised AFM would be redundant and unnecessary. Further, compliance with such requirements in
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