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Federal Register / Vol. 86, No. 157 / Wednesday, August 18, 2021 / Rules and Regulations h Definitions
DEPARTMENT OF TRANSPORTATION

1 For the purpose of this AD, an engine shop visit is the induction of an engine into the shop for maintenance involving the separation of pairs of major mating engine case flanges, except for the following, which do not constitute an engine shop visit:
i Separation of engine flanges solely for the purposes of transportation without subsequent maintenance does not constitute an engine shop visit.
ii Separation of engine flanges solely for the purpose of replacing the fan without subsequent maintenance does not constitute an engine shop visit.
2 For the purpose of this AD, a part eligible for installation is:
i For an HPC front hub: any HPC front hub with a P/N other than P/N 30G1910 or 30G3210; and ii For an HPC rotor shaft: any HPC rotor shaft with a P/N other than P/N 30G1854, 30G3109, 30G4995, 30G4953, or 31G0014.
i Alternative Methods of Compliance AMOCs 1 The Manager, ECO 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 certification office, send it to the attention of the person identified in Related Information. You may email your request to: ANE-AD-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.
j Related Information For more information about this AD, contact Mark Taylor, Aviation Safety Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone: 781
2387229; fax: 781 2387199; email:
Mark.Taylor@faa.gov.
k Material Incorporated by Reference None.
Issued on August 12, 2021.
Lance T. Gant, Director, Compliance & Airworthiness Division, Aircraft Certification Service.
FR Doc. 202117654 Filed 81721; 8:45 am
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Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210364; Project Identifier MCAI202000274R; Amendment 3921675; AD 20211613
RIN 2120AA64

Airworthiness Directives; Leonardo S.p.a. Helicopters Federal Aviation Administration FAA, DOT.
ACTION: Final rule.
AGENCY:

The FAA is adopting a new airworthiness directive AD for Leonardo S.p.a. Leonardo Model A109S and AW109SP helicopters with a certain part-numbered vertical fin vibration absorber installation installed.
This AD requires repetitive inspections of the vertical fin vibration absorber installation and the surrounding structure and depending on the inspection results, removing certain parts from service. This AD also prohibits installing certain partnumbered vertical fin vibration absorber installations on any helicopter. This AD
was prompted by a report of cracks and damage detected on the vertical fin absorber installation and surrounding structure during scheduled inspections.
The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective September 22, 2021.
ADDRESSES: For service information identified in this final rule, contact Leonardo S.p.a. Helicopters, Emanuele Bufano, Head of Airworthiness, Viale G.Agusta 520, 21017 C. Costa di Samarate Va Italy; telephone +39
0331225074; fax +390331229046; or at https www.leonardocompany.com/
en/home. You may view the referenced service information at the FAA, Office of the Regional Counsel, Southwest Region, 10101 Hillwood Pkwy., Room 6N321, Fort Worth, TX 76177.
SUMMARY:

Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210364; or in person at Docket Operations between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this final rule, the European Union Aviation Safety Agency EASA AD, any comments received, and other information. The street address for Docket Operations is U.S. Department of Transportation, Docket Operations,
PO 00000

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M30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION 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.
SUPPLEMENTARY INFORMATION:
Background The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would apply to Leonardo Model A109S and AW109SP helicopters with a vertical fin vibration absorber installation part number P/N 109B81079101
installed. The NPRM published in the Federal Register on May 13, 2021 86
FR 26198. In the NPRM, the FAA
proposed, within 30 hours time-inservice TIS, and thereafter at intervals not to exceed 100 hours TIS, removing the vertical fin vibration absorber installation and, using a mirror and light source, inspecting the rib assembly and depending on the inspection results, removing certain parts from service. The NPRM also proposed to require inspecting the vertical fin vibration absorber installation for hole elongation;
for fretting between the plate and the masses, and in between the masses; for fretting on the doubler; and the bolts for scratches and corrosion. Depending on the inspection results, the NPRM
proposed removing the vertical fin vibration absorber installation from service. The NPRM also proposed to require, within 12 months TIS, removing the vertical fin vibration absorber installation from service.
Finally, the NPRM proposed to prohibit installing an affected part on any helicopter, and provided a terminating action for the 100-hour TIS repetitive inspections.
The NPRM was prompted by EASA
AD 20140150, dated June 18, 2014
EASA AD 20140150, issued by EASA, which is the Technical Agent for the Member States of the European Union, to correct an unsafe condition for certain AgustaWestland S.p.A. now Leonardo S.p.a. Helicopters formerly Agusta S.p.A. Model A109S and AW109SP helicopters with an absorber P/N 109B81079101installed. EASA
advises that during a scheduled inspection on Model A109S and AW109SP helicopters, cracks and damage were detected on the vertical fin vibration absorber installation and the surrounding structure. EASA stated that investigation results determined the
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