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Federal Register / Vol. 86, No. 34 / Tuesday, February 23, 2021 / Rules and Regulations
the initial service bulletin general visual inspection in lieu of before further flight. SWA proposed that this allowance be listed within paragraph h of the proposed AD, similar to the allowance provided by paragraph i of the proposed AD.
The FAA agrees that allowing the AD
compliance time for an airplane with an existing repair to be the same as an aircraft without an existing repair will provide an acceptable level of safety.
Any alternative inspection program including compliance times must be done in accordance with an approved AMOC. The FAA has added paragraph h3 of this AD to address this change.
Request To Clarify Authority for Approval of Alternative Inspection Programs Southwest Airlines requested that the FAA clarify who has the authority to approve an alternative inspection program for any repair found during Boeing Alert Requirements Bulletin 73753A1383 RB, Revision 1, dated February 19, 2020, paragraph 1.E, Compliance, Table 1, Condition 1, Action 1. Paragraph j1 of the proposed AD clearly indicated that the manager of the Seattle ACO Branch has that authority; paragraph j3 of the proposed AD provided the path to obtain an AMOC by The Boeing Company Organization Designation Authorization ODA as delegated only for a repair, modification, and alteration. SWA requested clarification whether paragraph j3 of the proposed AD encompasses both existing repairs and repairs installed as a result of inspection findings. SWA asserted that it is unclear whether the reference to the repair is for an existing repair that is located in the inspection area or for a repair that is installed as a result of any crack finding.
The FAA agrees to clarify. The Boeing Company ODA has authority to approve AMOCs as authorized and delegated for repairs installed prior to the AD and repairs due to a crack finding, as well as repairs not due to a crack finding. An operator would need to provide The Boeing Company ODA with all details and geometry needed to design and analyze the repair data.
Request To Clarify the Use of Covers in the Service Information SWA commented that Boeing Alert Requirements Bulletin 73753A1383
RB, Revision 1, dated February 19, 2020, paragraph 1.E., Compliance, Table 1,
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note b, omits the inspection in areas where a repair covers the affected zone, provided conditions 1 and 2 are met. A
similar note is included in paragraph 1.E., Compliance, Table 2, note c.
SWA would like clarification of the word covers as it relates to repairs in the area. Since the configuration has changed because of the repair, SWA
stated that the repairs damage tolerance program provides an equivalent level of safety for this area.
The FAA has coordinated with Boeing to clarify the intent of the wording in this section. Note b in Table 1 and note c in Table 2 of Boeing Alert Requirements Bulletin 73753A1383
RB, Revision 1, dated February 19, 2020, paragraph 1.E., Compliance, apply to the area covered by a repair, but not for the area common to a repair. A
repair that is common to the area, meaning physically in the same area as the NPRM-proposed repair, but that was not meant to address the issue specified in the NPRM i.e., covered areas, could potentially be obscuring the inspections that would detect crack growth which this AD is meant to mitigate. Therefore, if a repair was not done as a corrective action for a crack in the bear strap, and the operator does not perform the inspections specified in the Boeing Alert Requirements Bulletin 73753A1383 RB, Revision 1, dated February 19, 2020, it may result in the unsafe condition. The FAA has not changed this AD as a result of this comment.
Request To Include Inspection Programs SWA commented that paragraph j3
of the proposed AD in the SNPRM
stated that an AMOC may be used for any required repair, modification, or alteration if approved by The Boeing Company ODA. SWA stated that inspection programs should be included in this list of conditions for which The Boeing Company ODA can provide an AMOC, as paragraph h2 explicitly states it is acceptable to accomplish alternative inspections approved in accordance with the procedures specified in paragraph j of the proposed AD.
The FAA agrees with the assertion that the inspection program may be part of the AMOC because the inspection program for the repaired area may be part of the repair, which in turn is part of the AMOC. However, the FAA
disagrees with changing this AD

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because an AMOC issued for a repair will include the inspection program.
The request to add certain inspection programs to The Boeing Company ODAauthorized list of AMOC approvals is outside the scope of this rulemaking.
Therefore, the FAA has not changed this AD in this regard.
Conclusion The FAA reviewed the relevant data, considered the comments received, and determined that air safety and the public interest require adopting this final rule with the change described previously and minor editorial changes.
The FAA has determined that these minor changes:
Are consistent with the intent that was proposed in the SNPRM for addressing the unsafe condition; and Do not add any additional burden upon the public than was already proposed in the SNPRM.
The FAA also determined that these changes will not increase the economic burden on any operator or increase the scope of this final rule.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Boeing Alert Requirements Bulletin 73753A1383
RB, Revision 1, dated February 19, 2020.
This service information describes procedures for inspecting for cracks of the fuselage skin and bear strap at the forward galley door between certain stations, through the use of two alternative inspection methods for the initial inspections: 1 Internal and external general visual inspections and internal surface high frequency eddy current HFEC inspections, and 2
external general visual and external eddy current inspections. This service information also describes procedures for applicable on-condition actions including inspections for cracks, HFEC
inspections for cracks, low frequency eddy current LFEC inspections for cracks, and repair, depending on the inspection method selected. This service information 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 752 airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:

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