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Federal Register / Vol. 86, No. 204 / Tuesday, October 26, 2021 / Rules and Regulations
types and sleeving that are installed as part of an aircraft design change. Each applicant for any design change is still responsible to show that the installation of alternative wire types and sleeving identified in paragraphs h1 and 2 of this AD complies with all applicable regulatory requirements. This responsibility includes, but is not limited to, substantiation of compliance with flammability requirements, and substantiation that shows that sleeve installation, including the selection of sleeve thickness, is adequate to protect wires from chafing for the life of the installation. If such an installation is found to be compliant with all applicable regulatory requirements, revision of AWL No. 28AWL09 in accordance with paragraph h of this AD would allow the installation of the alternative wire types and sleeving. The FAA has not changed this AD with regard to this request.
Request To Exempt Certain Airplanes From Initial Compliance Times UAL recommended that airplanes in long-term storage be exempted from the applicable initial compliance times, and that the ALI tasks be accomplished at the applicable initial compliance times after return to service. UAL stated that many of the affected airplanes are now in long-term storage.
The FAA does not agree to extend the compliance time to begin after return to service for airplanes in long-term storage. In developing an appropriate compliance time for the tasks required by this AD, the FAA considered relevant safety issues as well as Boeings recommendations. The FAA concluded that the inspections must be completed as stated in revised paragraphs g1
through 14 of this AD, although the FAA may consider requests for approval of AMOCs from operators with special circumstances. This AD has not been changed with regard to this request.
Request for Clarification of Initial Compliance Times JAL requested clarification about whether the initial compliance time for airplanes with no initial inspections performed or with Boeing Service Bulletin 767470001 incorporated is the ALIs threshold from airplane delivery or the accomplishment date of the service bulletin. JAL asserted that in similar FAA ADs or proposed ADs, the initial compliance time for airplanes with no inspections performed is the ALIs threshold from airplane delivery.
The FAA agrees with JALs assertions, and has determined that neverinspected airplanes should be allowed the full compliance time the applicable
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AWL interval from airplane delivery.
Furthermore, airplanes for which the referenced AWL was not previously included in the operators maintenance/
inspection program should be allowed a grace period if the AWL interval has passed.
For the foregoing reasons, the FAA
has revised the compliance times for the initial tasks in paragraphs g1 through 14 of this AD. While the revised paragraphs may appear significantly different from those in the proposed AD, the compliance times are the same as proposed for most operatorsexcept for the extension of certain compliance times that will provide relief for some operators. The FAAs safety assessment indicates that these changes will provide an acceptable level of safety.
The proposed AD has been changed in the following ways:
The compliance times for each AWL are provided for two groups of airplanes, based on whether their maintenance program had previously included the specific AWL. The AWLs that are included in an operators maintenance program depend on several factors, including the certification basis for the airplane and applicable regulations including airworthiness directives in effect when the airplane is produced and subsequent to airplane delivery. Therefore, some AWLs identified in paragraph g of this AD
may not have previously been included in the existing maintenance program.
For an AWL that was previously incorporated, the airplane, whether previously inspected or not, is provided the full compliance time. Although the proposed AD would have required inspecting never-inspected airplanes within the shorter grace period, the FAA
had intended to provide the full interval specified in the AWL, starting from airplane delivery or from the last inspection.
The FAA has revised the grace period from 30 days to 60 days in paragraphs g2, 4, 6, 7, 9, 10, 11, and 12 of this AD. With this change, compliance for those specific tasks will not be required earlier than the compliance time to revise the maintenance program.
Request To Update Applicability UPS requested an update to paragraph c, Applicability, of the proposed AD
to specify airplanes as identified in Boeing 767200/300/300F/400ER
Special Compliance Items/
Airworthiness Limitations, D622T001
904, dated January 2020. UPS stated that the update is needed to clarify that each task within Boeing 767200/300/
300F/400ER Special Compliance Items/

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Airworthiness Limitations, D622T001
904, dated January 2020, is required only for the airplanes for which it is identified as applicable, and not for all airplanes having L/N 1 through 1200
inclusive regardless of the task applicability.
The FAA disagrees with the request.
Each task in Boeing 767200/300/300F/
400ER Special Compliance Items/
Airworthiness Limitations, D622T001
904, dated January 2020, is required only for specific airplanes, but paragraph c, Applicability, of this AD must include every airplane that is subject to any requirement in the AD.
This AD has not been changed with regard to this request.
Conclusion The FAA reviewed the relevant data, considered any comments received, and determined that air safety requires adopting this AD as proposed. Except for minor editorial changes, and any other changes described previously, this AD is adopted as proposed in the NPRM. None of the changes will increase the economic burden on any operator.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Boeing 767200/
300/300F/400ER Special Compliance Items/Airworthiness Limitations, D622T001904, dated January 2020.
This service information describes AWLs that include airworthiness limitation instructions ALIs and critical design configuration control limitations CDCCLs tasks related to fuel tank ignition prevention and the nitrogen generation system. 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 500 airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:
The FAA has determined that revising the existing maintenance or inspection program takes an average of 90 workhours per operator, although the agency recognizes that this number may vary from operator to operator. Since operators incorporate maintenance or inspection program changes for their affected fleets, the FAA has determined that a per-operator estimate is more accurate than a per-airplane estimate. Therefore, the FAA estimates the average total cost per operator to be
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