Federal Register - June 24, 2021
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Source: Federal Register
33102
Federal Register / Vol. 86, No. 119 / Thursday, June 24, 2021 / Rules and Regulations
adjoining parts cracking and a potential fuel leak and consequent fire.
Discussion of Final Airworthiness Directive Comments The FAA received a comment from Boeing who supported the NPRM
without change.
The FAA also received an additional comment from Aviation Partners Boeing.
Effect of Winglets on Accomplishment of the Proposed Actions Aviation Partners Boeing stated that accomplishing Supplemental Type Certificate STC ST01219SE does not affect the actions specified in the proposed AD.
The FAA concurs with the commenter. The FAA has redesignated paragraph c of the proposed AD as paragraph c1 of this AD and added
paragraph c2 to this AD to state that installation of STC ST01219SE does not affect the ability to accomplish the actions required by this AD. Therefore, for airplanes on which STC ST01219SE
is installed, a change in product alternative method of compliance AMOC approval request is not necessary to comply with the requirements of 14 CFR 39.17.
Conclusion The FAA reviewed the relevant data, considered any comments received, and determined that air safety requires adopting this AD as proposed.
Accordingly, the FAA is issuing this AD
to address the unsafe condition on these products. 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 Alert Requirements Bulletin 73757A1347
RB, dated July 29, 2020. The service information describes procedures for repetitive surface HFEC inspections at the radius of the leftand right-side of the STA 540 bulkhead splice angle for any cracking, and applicable oncondition actions. On-condition actions include repair or replacement. 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 ADDRESSES.
Costs of Compliance The FAA estimates that this AD
affects 117 airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:
ESTIMATED COSTS FOR REQUIRED ACTIONS
Action
Labor cost
Repetitive surface HFEC inspections.
7 work-hour $85 per hour =
$595 per inspection cycle.
The FAA estimates the following costs to do any necessary on-condition
Cost per product
Cost on U.S.
operators
$595 per inspection cycle
$69,615 per inspection cycle.
Parts cost $0
actions that would be required. The FAA has no way of determining the
number of aircraft that might need these on-condition actions:
ESTIMATED COSTS OF ON-CONDITION ACTIONS
Labor cost
Parts cost
Up to 53 work-hour $85 per hour = Up to $4,505 replacement.
Up to $1,000
The FAA has received no definitive data on which to base the cost estimates for the on-condition repair specified in this AD.
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Authority for This Rulemaking Title 49 of the United States Code specifies the FAAs authority to issue rules on aviation safety. Subtitle I, section 106, describes the authority of the FAA Administrator. Subtitle VII:
Aviation Programs, describes in more detail the scope of the Agencys authority.
The FAA is issuing this rulemaking under the authority described in Subtitle VII, Part A, Subpart III, Section 44701: General requirements. Under that section, Congress charges the FAA
with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce.
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Cost per product Up to $5,505.
This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action.
on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.
Regulatory Findings
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.
This AD will not have federalism implications under Executive Order 13132. This AD will not have a substantial direct effect on the States, on the relationship between the national government and the States, or on the distribution of power and responsibilities among the various levels of government.
For the reasons discussed above, I
certify that this AD:
1 Is not a significant regulatory action under Executive Order 12866, 2 Will not affect intrastate aviation in Alaska, and 3 Will not have a significant economic impact, positive or negative,
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List of Subjects in 14 CFR Part 39
The Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows:
PART 39AIRWORTHINESS
DIRECTIVES
1. The authority citation for part 39
continues to read as follows:
Authority: 49 U.S.C. 106g, 40113, 44701.
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