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Federal Register / Vol. 86, No. 97 / Friday, May 21, 2021 / Proposed Rules
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210373; Project Identifier MCAI202001352R
RIN 2120AA64

Airworthiness Directives; Leonardo S.p.a. Helicopters Federal Aviation Administration FAA, DOT.
ACTION: Notice of proposed rulemaking NPRM.
AGENCY:

The FAA proposes to supersede Airworthiness Directive AD
20201911 for certain Leonardo S.p.a.
Model A119 and AW119 MKII
helicopters. AD 20201911 requires repetitive borescope inspections of the 90-degree tail rotor gearbox TGB and depending on the inspection results, removing the TGB from service. Since the FAA issued AD 20201911, it was determined that additional parts may be susceptible to the unsafe condition. This proposed AD would retain the inspection requirements of AD 2020
1911, and revise the compliance time and applicability. The FAA is proposing this AD to address the unsafe condition on these products.
DATES: The FAA must receive comments on this proposed AD by July 6, 2021.
ADDRESSES: You may send comments, using the procedures found in 14 CFR
11.43 and 11.45, by any of the following methods:
Federal eRulemaking Portal: Go to https www.regulations.gov. Follow the instructions for submitting comments.
Fax: 202 4932251.
Mail: U.S. Department of Transportation, Docket Operations, M
30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
Hand Delivery: Deliver to Mail address above between 9 a.m. and 5
p.m., Monday through Friday, except Federal holidays.
For service information identified in this NPRM, contact Leonardo S.p.a.
Helicopters, Emanuele Bufano, Head of Airworthiness, Viale G.Agusta 520, 21017 C.Costa di Samarate Va Italy;
telephone +390331225074; fax +39
0331229046; or at https
www.leonardocompany.com/en/home.
You may view this service information at the FAA, Office of the Regional Counsel, Southwest Region, 10101
Hillwood Pkwy., Room 6N321, Fort Worth, TX 76177. For information on the availability of this material at the FAA, call 817 2225110.

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SUMMARY:

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Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210373; 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 NPRM, the European Union Aviation Safety Agency EASA AD, any comments received, and other information. The street address for Docket Operations is listed above.
FOR FURTHER INFORMATION CONTACT: Rao Edupuganti, Aerospace Engineer, Dynamic Systems Section, Technical Innovation Policy Branch, FAA, 10101
Hillwood Pkwy., Fort Worth, TX 76177;
telephone 817 2225110; email rao.edupuganti@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.
FAA20210373; Project Identifier MCAI202001352R 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.
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
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under the FOIA, and they will not be placed in the public docket of this NPRM. Submissions containing CBI
should be sent to Rao Edupuganti, Aerospace Engineer, Dynamic Systems Section, Technical Innovation Policy Branch, telephone 817 2225110;
email rao.edupuganti@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.
Background The FAA issued AD 20201911, Amendment 3921254 85 FR 59404, September 22, 2020 AD 20201911
for Leonardo Model A119 and AW119
MKII helicopters with TGB part number P/N 109044006 101 or P/N 109
044006105 having serial number S/
N 167, 169 through 172 inclusive, 215
through 225 inclusive, 227, 230, 232, 233, AW268, K3, K16, M47, or L29, installed. AD 20201911 requires within 25 hours time-in-service TIS or 3 months, whichever occurs first, and thereafter at intervals not to exceed 100
hours TIS or 6 months, whichever occurs first, borescope inspecting the internal surface of the TGB output shaft for corrosion and depending on the inspection results, removing the TGB
from service before further flight.
AD 20201911 was prompted by EASA AD 20180156, dated July 24, 2018 EASA AD 20180156, issued by the EASA, which is the Technical Agent for the Member States of the European Union, to correct an unsafe condition for Leonardo S.p.a. Helicopters formerly Finmeccanica S.p.A., AgustaWestland S.p.A., Agusta S.p.A.;
and AgustaWestland Philadelphia Corporation, formerly Agusta Aerospace Corporation Model A119 and AW119MKII helicopters with TGB P/N
109044006101 or P/N 109044006
105 having serial number 167, 169
through 172 inclusive, 215 through 225
inclusive, 227, 230, 232, 233, AW268, K3, K16, M47, or L29, installed. EASA
AD 20180156 advised of two reported occurrences of corrosion on the internal surface of the TGB shaft installed on Model A119 helicopters. Further analysis identified a specific batch of parts that may be susceptible to similar conditions. Due to design similarity Model AW119MKII helicopters are also affected. This condition, if not addressed, could result in failure of the tail rotor, possibly resulting in reduced control of the helicopter.
Accordingly, the EASA AD required performing repetitive endoscope inspections on the internal surface of the TGB output shaft for corrosion and depending onthe findings, replacing the
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