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Federal Register / Vol. 86, No. 157 / Wednesday, August 18, 2021 / Rules and Regulations structural integrity of the helicopter and lead to subsequent loss of control of the helicopter.
f Compliance Comply with this AD within the compliance times specified, unless already done.

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g Required Actions 1 Within 30 hours time-in-service TIS
after the effective date of this AD, and thereafter at intervals not to exceed 100 hours TIS:
i Remove the vertical fin vibration absorber installation P/N 109B81079101, and using a mirror and light source, visually inspect the rib assembly P/N 109037253
201 for hole elongation, fretting, and cracks.
If there is any hole elongation, fretting, or cracks, before further flight, remove rib assembly P/N 109037253201, shim P/N
109037253211, doubler P/N 1090372
53213, and bracket P/N 109037302113
from service and replace with airworthy parts.
ii Inspect the vertical fin vibration absorber installation P/N 109B81079101
for hole elongation; for fretting between the plate and the masses and in-between the masses; for fretting on doubler P/N 109037253213; and the bolts for scratches and corrosion. If there is any hole elongation; fretting between the plate and the masses or in-between the masses; fretting on doubler P/N 109037253213; or bolts with scratches or corrosion, before further flight, remove the vertical fin vibration absorber installation P/N 109B81079101 from service.
2 Within 12 months after the effective date of this AD unless already accomplished per paragraph g1ii of this AD, remove the vertical fin vibration absorber installation P/N 109B81079101 from service.
3 As of the effective date of this AD, do not install vertical fin vibration absorber installation P/N 109B81079101 on any helicopter.
4 Removing the vertical fin vibration absorber installation P/N 109B81079101
from service, as described in paragraphs g1ii or 2 of this AD provides a terminating action for the 100 hour TIS
repetitive inspections required by paragraph g1 of this AD.
h Alternative Methods of Compliance AMOCs 1 The Manager, International Validation Branch, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. In accordance with 14 CFR 39.19, send your request to your principal inspector or local Flight Standards District Office, as appropriate. If sending information directly to the manager of the International Validation Branch, send it to the attention of the person identified in paragraph i1 of this AD.
Information may be emailed to: 9-AVS-AIR730-AMOC@faa.gov.
2 Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the local flight standards district office/
certificate holding district office.

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i Related Information 1 For more information about this AD, contact Kristin Bradley, Aerospace Engineer, General Aviation & Rotorcraft Section, International Validation Branch, FAA, 10101
Hillwood Pkwy., Fort Worth, TX 76177;
telephone 817 2225110; email kristin.bradley@faa.gov.
2 The subject of this AD is addressed in European Union Aviation Safety Agency EASA AD 20190294, dated December 4, 2019. You may view the EASA AD on the internet at https www.regulations.gov in Docket No. FAA20210364.
Issued on July 29, 2021.
Lance T. Gant, Director, Compliance & Airworthiness Division, Aircraft Certification Service.
FR Doc. 202117605 Filed 81721; 8:45 am BILLING CODE 491013P

DEPARTMENT OF HOMELAND
SECURITY
Coast Guard 33 CFR Part 100
Docket Number USCG20210639
RIN 1625AA08

Special Local Regulation; Low Country Splash Open Water Swim, Charleston, SC
Coast Guard, DHS.
Temporary final rule.

AGENCY:
ACTION:

The Coast Guard is establishing a special local regulation on the waters of the Wando River, Cooper River, and Charleston Harbor in Charleston, SC. This action is necessary to provide for the safety of life on navigable waters during the Low Country Splash Open Water Swim. This rulemaking would restrict persons and vessels from entering certain waters of the Wando River, Cooper River, and Charleston Harbor, unless authorized by Sector Charleston Captain of the Port or a designated representative.
DATES: This rule is affective from 7 a.m.
until 11 a.m., on September 18, 2021.
ADDRESSES: To view documents mentioned in this preamble as being available in the docket, go to https
www.regulations.gov, type USCG2021
0639 in the SEARCH box and click SEARCH. Click on Open Docket Folder on the line associated with this rule.
FOR FURTHER INFORMATION CONTACT: If you have questions on this rule, call or email Lieutenant Commander Chad Ray, Sector Charleston Waterways Management Division, Coast Guard;
telephone 843 7403184, email Chad.L.Ray@uscg.mil.
SUMMARY:

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SUPPLEMENTARY INFORMATION:

I. Table of Abbreviations CFR Code of Federal Regulations DHS Department of Homeland Security FR Federal Register NPRM Notice of proposed rulemaking Section U.S.C. United States Code
II. Background Information and Regulatory History The Coast Guard is issuing this temporary rule without prior notice and opportunity to comment pursuant to authority under section 4a of the Administrative Procedure Act APA 5
U.S.C. 553b. This provision authorizes an agency to issue a rule without prior notice and opportunity to comment when the agency for good cause finds that those procedures are impracticable, unnecessary, or contrary to the public interest. Under 5 U.S.C.
553bB, the Coast Guard finds that good cause exists for not publishing a notice of proposed rulemaking NPRM
with respect to this rule because it is impracticable. The Coast Guard has published a special local regulation for this event in 33 CFR 100.704, Table 1
to 100.704, Line No. 4; however, the existing special location regulation is dated for the first week of May while this years event is scheduled for September 18, 2021.
Under 5 U.S.C. 553d3, the Coast Guard finds that good cause exists for making this rule effective less than 30
days after publication in the Federal Register. Delaying the effective date of this rule would be contrary to the public interest because the potential safety hazards associated with the Low Country Splash Open Water Swim taking place on September 18, 2021.
III. Legal Authority and Need for Rule The Coast Guard is issuing this rule under authority in 46 U.S.C. 70041. The Captain of the Port Charleston COTP
has determined that potential hazards associated with the Low Country Splash Open Water Swim event presents a safety concern for anyone in the vicinity of the regulated area during the event.
This rule is needed to protect participants, spectators, and the general public in the navigable waters within the regulated area during the Low Country Splash Open Water Swim event.
IV. Discussion of the Rule This rule establishes a special local regulation from 7 a.m. until 11 a.m., on September 18, 2021. The special local regulation will cover all navigable waters within a moving zone, beginning at Daniel Island Pier, south along the
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