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Federal Register / Vol. 86, No. 34 / Tuesday, February 23, 2021 / Rules and Regulations
and the FAAs response to each comment.
Support for the NPRM
The Air Line Pilots Association, International ALPA stated its support for the NPRM.
Request To Include Applicability Exception Delta Air Lines Delta asked that the FAA include an exception statement in paragraph c of the proposed AD
related to Airbus modification 58345.
Delta stated that EASA AD 20200093
includes the statement except those on which Airbus modification mod 58345
has been embodied in production.
Delta added that this would remove the need for operators of post mod 58345
airplanes to demonstrate compliance with an AD for which compliance is impossible.
The FAA does not agree with the commenters request. Paragraph c of this AD identifies the affected airplane models and specifies that this AD is applicable to the airplanes identified in EASA AD 20200093. Because the applicability identified in EASA AD
20200093 excludes airplanes on which Airbus modification 58345 is embodied in production, it is not necessary to restate that exclusion in this AD. EASA
AD 20200093 is incorporated by reference in its entirety, which includes the applicability therein. Therefore, the FAA has not changed this AD in this regard.
Request To Change AOT Reference Delta asked that the in accordance with statement in paragraph g of the proposed AD be replaced by refer to Airbus Alert Operators Transmission AOT A29L01019, Revision 01, dated February 18, 2020, paragraphs 4.4.2.1.8, 4.4.2.1.10, 4.4.2.2.9 and 4.4.2.2.11. Delta stated that the EASA
AD mandates accomplishment of the referenced AOT, and the AOT includes the following note: NOTE 2: The accomplishment instructions of this AOT include procedures given in other documents or in other sections of the AOT. When the words refer to are used and the operator has a procedure accepted by the local authority he belongs to, the accepted alternative procedure can be used. When the words in accordance with are used then the
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given procedure must be followed.
Delta added that paragraphs 4.4.2.1.8
and 4.4.2.2.9 of the AOT use both refer to and in accordance with, and paragraphs 4.4.2.1.10 and 4.4.2.2.11 of the AOT use in accordance with when referencing the Airplane Maintenance Manual AMM
wirelocking procedures. Delta further noted that in all cases, the AOT refers to standard AMM procedures, testing and wirelocking. As standard procedures, Delta recommended that the in accordance with statement be replaced by refer to for paragraphs 4.4.2.1.8, 4.4.2.1.10, 4.4.2.2.9 and 4.4.2.2.11 of the AOT.
The FAA agrees with the commenters request for further clarification. It should be clear to operators whether specific procedures are mandatory.
Paragraph h3 of the proposed AD
specified compliance with paragraph 4.4.2., Accomplishment Instructions, of the AOT only. This means that these actions must be completed in accordance with certain procedures specified in the Airbus AMM tasks defined in Airbus AOT A29L01019, Revision 01, dated February 18, 2020.
The FAA has clarified paragraph h3
of this AD as follows: Where EASA AD
20200093 specifies to comply with the instructions of the AOT, and the AOT specifies that the accomplishment instructions marked as Required for Compliance RC must be done this AD requires compliance with paragraph 4.4.2., Accomplishment Instructions, of the AOT Airbus Alert Operators Transmission A29L01019, Revision 01, dated February 18, 2020
only; except paragraphs 4.4.2.11 and 4.4.2.21 which specify gaining access to the ground service manifold and preparation for update and may be accomplished in accordance with the operators maintenance or inspection program.
Conclusion The FAA reviewed the relevant data, considered the comments received, and determined that air safety and the public interest require adopting this AD
with the change described previously, and minor editorial changes. The FAA
has determined that these minor changes:

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Are consistent with the intent that was proposed in the NPRM for addressing the unsafe condition; and Do not add any additional burden upon the public than was already proposed in the NPRM.
The FAA also determined that this change will not increase the economic burden on any operator or increase the scope of this AD.
Related Service Information Under 1
CFR Part 51
EASA AD 20200093 describes procedures for replacement of the hydraulic system GSM manual valve attachment screws. For GSMs with part number P/N 709023 or P/N 709024
installed with screws having P/N
NAS11013H8, EASA AD 20200093
describes procedures for repetitive replacement of those screws with new screws having P/N NAS11013H8. For GSMs with P/N 709025 installed with screws having P/N NAS11013H8, EASA AD 20200093 describes procedures for replacement of those screws with new bolts having P/N
EWB0420D3H3 or four new screws having P/N NAS11013H8; if new screws are installed, EASA AD 2020
0093 describes procedures for replacing them with new bolts having P/N
EWB0420D3H3 before the screws exceed 10,000 flight cycles since installation on an airplane. EASA AD
20200093 also describes an optional terminating modification replacement of all affected GSMs, which would terminate the repetitive replacements of the attachment screws.
Airbus AOT A29L01019, Revision 01, dated February 18, 2020, describes procedures for initial and repetitive replacement of certain GSM manualvalve screws and a one-time visual inspection to determine if certain GSM
manual-valve screws are installed instead of the correct bolts.
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.
Costs of Compliance The FAA estimates that this AD
affects 107 airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:

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