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Federal Register / Vol. 86, No. 160 / Monday, August 23, 2021 / Proposed Rules
Boston ACO Branch, Compliance &
Airworthiness Division, FAA, 1200
District Avenue, Burlington, Massachusetts 01803; telephone 781
2387799; email: Jared.M.Hyman@
faa.gov.
SUPPLEMENTARY INFORMATION:

Comments Invited The FAA invites you to send any written relevant data, views, or arguments about this proposal. Send your comments to an address listed under ADDRESSES. Include Docket No.
FAA20210689; Project Identifier AD
202001589R at the beginning of your comments. The most helpful comments reference a specific portion of the proposal, explain the reason for any recommended change, and include supporting data. The FAA will consider all comments received by the closing date and may amend this proposal because of those comments.
Except for Confidential Business Information CBI as described in the following paragraph, and other information as described in 14 CFR
11.35, the FAA will post all comments received, without change, to https
www.regulations.gov, including any personal information you provide. The agency will also post a report summarizing each substantive verbal contact received about this NPRM.

jbell on DSKJLSW7X2PROD with PROPOSALS

Confidential Business Information CBI is commercial or financial information that is both customarily and actually treated as private by its owner.
Under the Freedom of Information Act FOIA 5 U.S.C. 552, CBI is exempt from public disclosure. If your comments responsive to this NPRM
contain commercial or financial information that is customarily treated as private, that you actually treat as private, and that is relevant or responsive to this NPRM, it is important that you clearly designate the submitted comments as CBI. Please mark each page of your submission containing CBI
as PROPIN. The FAA will treat such marked submissions as confidential under the FOIA, and they will not be placed in the public docket of this NPRM. Submissions containing CBI
should be sent to Jared Hyman, Aerospace Engineer, Boston ACO
Branch, Compliance & Airworthiness Division, FAA, 1200 District Avenue, Burlington, Massachusetts 01803;
telephone 7812387799; email:
Jared.M.Hyman@faa.gov. Any commentary that the FAA receives which is not specifically designated as CBI will be placed in the public docket for this rulemaking.

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Background The FAA was notified of an in-service crack in a swashplate assembly inner ring. The crack, discovered during a routine inspection, extended between the uniball bore and near the right-hand trunnion to servo attach bolt hole. This condition, if not detected and corrected, could result in fretting wear on the shoulder that supports the clamp-up of the uniball outer race, failure of the swashplate assembly, and subsequent loss of control of the helicopter.
FAAs Determination The FAA is issuing this NPRM after determining that the unsafe condition described previously is likely to exist or develop on other products of the same type design.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Sikorsky Aircraft Corporation Alert Service Bulletin ASB
9262009, Basic Issue, dated February 6, 2019 ASB. The ASB specifies a onetime visual inspection of the swashplate assembly to determine if there are any cracks. If cracks are found, the ASB
specifies replacing the swashplate assembly. If there is any other damage such as nicks, dents, or scratches, the ASB specifies providing that damage information to Sikorsky. The ASB also specifies returning the swashplate assembly, uniball bearing, trunnions, and all attachment hardware to Sikorsky for investigation if cracks are found.
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.
Proposed AD Requirements in This NPRM
This proposed AD would require, within 50 hours time-in-service TIS, and thereafter at intervals not to exceed 50 hours TIS, visually inspecting the upper and lower surfaces of the swashplate assembly for a crack, nick, dent, and scratch. If there is a crack, nick, dent, or scratch that exceeds allowable limits, this proposed AD
would require removing the swashplate assembly from service before further flight.
Differences Between This Proposed AD
and the Service Information The ASB specifies a one-time visual inspection of the swashplate assembly;
this proposed AD would require repetitive visual inspections of the swashplate assembly to determine if any crack, nick, dent, or scratch develops over time. This proposed AD would not
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require returning parts to or contacting Sikorsky, while the ASB specifies performing those actions.
Costs of Compliance The FAA estimates that this AD
would affect 89 helicopters of U.S.
Registry and that operators may incur the following costs in order to comply with this proposed AD. Labor costs are estimated at $85 per work-hour.
Visually inspecting a swashplate assembly would take about 0.5 workhour, for an estimated cost of $43 per helicopter and $3,827 for the U.S. fleet, per inspection cycle.
Replacing the swashplate assembly, if required, would take about 16 workhours and parts would cost about $389,720, for an estimated cost of $391,080 per helicopter.
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.
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.
Regulatory Findings The FAA determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would 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 this proposed regulation:
1 Is not a significant regulatory action under Executive Order 12866, 2 Would not affect intrastate aviation in Alaska, and 3 Would not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.

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