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Federal Register / Vol. 86, No. 221 / Friday, November 19, 2021 / Rules and Regulations
Request To Include All Required Airplanes in the SUMMARY of the NPRM
Bradley Schrock requested the FAA
include the additional required Airbus Model airplanes in the SUMMARY section of the NPRM. The commenter pointed out that the additional models could easily be overlooked if the reader were to only read the SUMMARY of the NPRM.
The FAA does not agree to revise the SUMMARY of this final rule. Operators are required to follow the applicability of the AD, which is specified in paragraph c of this AD. While the SUMMARY of this final rule doesnt specify all airplanes affected by this AD, it does specify that the FAA is adding airplanes to the applicability. Additionally, in the Background section of this final rule, the FAA has included all airplane models that are affected by this AD.
Further, the SUMMARY section is a preamble requirement for all documents published in the Federal Register and must follow drafting requirements prescribed by the Office of the Federal Register OFR. The SUMMARY section briefly provides context for the document within the Federal Register/
CFR publication system; it does not summarize the content of the document.
Adding the requested airplane models does not follow the OFRs requirements for the SUMMARY section. The FAA has not changed this final rule in this regard.

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Request To Revise Compliance Statement in Paragraph f of the Proposed AD for Model A321 Airplanes Delta Air Lines DAL requested that the FAA revise the compliance statement in paragraph f of the proposed AD for Model A321 airplanes.
DAL suggested that paragraph f of the NPRM be revised to read: Comply with this AD within the compliance times specified, unless already done. For A321 operators, the earliest date that compliance may have occurred is 29MAY2020 the issuance date of EASA PAD 19100R1. DAL pointed out that the suspected parts are line replaceable units LRUs with off-wing Instructions for Continued Airworthiness, and that these parts comprise a pool of rotable parts. DAL
then specified that no revision of the service information referenced in EASA
AD 20200174 has included the serial numbers of outer flap tabs. DAL stated that EASA AD 20200174 allows the use of any revision of the service information for the determination of these suspected parts. Further, DAL
argued that, for Model A321 operators, the use of any service information revision for determination of suspected
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part applicability is inadequate for the identification of suspected outer flap tabs. DAL asserted that before May 29, 2020, comparison with the outer flap serial number lists within the service information referenced in EASA AD
20200174 could allow inadvertent exclusion of an outer flap tab that is included in the quality escape population.
The FAA does not agree to revise the compliance statement in paragraph f of this AD. As stated previously, EASA AD
20200174 takes precedence over the service information referenced therein and this AD requires using EASA AD
20200174 for determining suspected parts. EASA AD 20200174 specifies using the service information only for accomplishing the required inspections and not for identifying the suspected parts. The FAA has determined EASA
AD 20200174 addresses the unsafe condition on the universe of suspected parts. Further, the FAA has determined that the information provided by EASA
and the manufacturer is adequate information for accomplishing the required actions. The FAA has not changed this AD regarding this issue.
Request To Add Exception To Clarify the Definition of Suspected Improperly Heat Treated IHT Parts DAL requested that the FAA revise the NPRM to include an exception to EASA AD 20200174 to clarify the definition of suspected IHT parts for Model A321 airplanes. DAL specified that, for Model A321 airplanes, the suspected IHT parts are constituent parts of the outer flap tabs, not the outer flaps as defined in EASA AD 2020
0174. DAL mentioned that if not clarified, the definition could introduce confusion for operators of Model A321
airplanes.
The FAA does not agree to include an exception to EASA AD 20200174.
Appendix 2 of EASA AD 20200174
refers to the airplane manufacturer serial numbers, flap serial numbers, and the flap tab part numbers, based on the airplane configuration at the time of delivery to the first operator. Therefore, the FAA has determined that, even though the definition specified in EASA
AD 20200174 does not explicitly state that, for Model A321 airplanes the suspected IHT parts are constituent to the outer flap tabs, the information necessary to make that determination is already included in Appendix 2 of EASA AD 20200174, which the definition references. The FAA has not changed this AD regarding this issue.

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Request To Include Additional Service Information for Determining Affected Parts DAL requested that the FAA revise the NPRM to include Airbus In-Service Information ISI Document 57.50.00022, which DAL stated includes outer flap and outer flap tab part number definitions for the serial numbers defined in Appendix 1 and Appendix 2 of EASA AD 20200174.
DAL pointed out that Appendix 1 and Appendix 2 of EASA AD 20200174 do not contain any outer flap or outer flap tab Model A321 part numbers, instead specifying the suspected part population by LRU serial number. DAL
also mentioned that Airbus does not consider the Model A321 flap tab serial numbers to be Aircraft Inspection Report AIR recordable within each airplanes delivery records. DAL
implied that most operators would have difficulty tracing outer flap tab serial numbers to specific airplane manufacturer serial numbers. DAL also stated that there has been enough operator demand for clarification from the manufacturer that Airbus released ISI 57.50.00022. DAL noted that ISI
57.50.00022 is not referenced in the service information specified by EASA
AD 20200174.
The FAA disagrees with the request.
This AD is based on EASA AD 2020
0174, which is based on the configuration of the airplane at the time of delivery as indicated in Notes 2 and 3 of EASA AD 20200174. It is not possible for the FAA to know all of the operator-specific part numbers and serial numbers installed on all of the airplanes affected by this AD or EASA
AD 20200174. Therefore, it is the operators responsibility to track these parts, so that they can identify discrepant parts as defined in the EASA
AD and apply appropriate corrective actions. If an operators fleet configuration, including part tracking system, does not allow compliance with the requirements of this AD, then that operator must present a customized plan for AD compliance for the applicable airplane with a request for an alternative method of compliance AMOC under the provisions of paragraph i1 of this AD. It is impractical for the FAA to customize an AD in a way that meets operators specific requirements for compliance.
The FAA has not changed this AD
regarding this issue.
Request To Include an Exception to the Method of Compliance DAL requested that the FAA add an exception to include a statement that,
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