39984 Federal Register / Vol. 86, No. 140 / Monday, July 26, 2021 / Proposed Rules 

TABLE 1 TO PARAGRAPH (c)—Continued 

NRC small entity classification 

Maximum 

annual fee 

per licensed 

category 

$555,000 to $8 million .................................................................................................................................................................. 4,900 

Less than $555,000 ...................................................................................................................................................................... 1,000 

Manufacturing Entities that Have An Average of 500 Employees or Fewer: 

35 to 500 employees .................................................................................................................................................................... 4,900 

Fewer than 35 employees ............................................................................................................................................................ 1,000 

Small Governmental Jurisdictions (Including publicly supported educational institutions) (Population): 

20,000 to 49,999 .......................................................................................................................................................................... 4,900 

Fewer than 20,000 ....................................................................................................................................................................... 1,000 

Educational Institutions that are not State or Publicly Supported, and have 500 Employees or Fewer: 

35 to 500 employees .................................................................................................................................................................... 4,900 

Fewer than 35 employees ............................................................................................................................................................ 1,000 

* * * * * 

Dated: July 1, 2021. 

For the Nuclear Regulatory Commission. 

Cherish K. Johnson, 

Chief Financial Officer. 

[FR Doc. 2021–15506 Filed 7–23–21; 8:45 am] 

BILLING CODE 7590–01–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–0579; Project 

Identifier MCAI–2020–00267–R] 

RIN 2120–AA64 

Airworthiness Directives; Leonardo 

S.p.a. Helicopters 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to adopt a 

new airworthiness directive (AD) for 

certain Leonardo S.p.a. (Leonardo) 

Model AB139 and AW139 helicopters. 

This proposed AD was prompted by a 

report of several occurrences of a 

cracked main gearbox (MGB) spherical 

bearing lock nut (lock nut). This 

proposed AD would require removing 

from service a certain part-numbered 

MGB lock nut that is installed on certain 

part-numbered MGBs and replacing it 

with newly designed MGB lock nut. 

This proposed AD would also would 

prohibit installing any MGB with the 

affected MGB lock nut and would 

prohibit installing any affected MGB 

lock nut on any helicopter. 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 September 9, 

2021. 

ADDRESSES: You may send comments by 

any of the following methods: 

• Federal eRulemaking Docket: Go to 

https://www.regulations.gov. Follow the 

online instructions for sending your 

comments electronically. 

• Fax: (202) 493–2251. 

• Mail: U.S. Department of 

Transportation, Docket Operations, 

M–30, West Building Ground Floor, 

Room W12–140, 1200 New Jersey 

Avenue SE, Washington, DC 20590– 

0001. 

• Hand Delivery: Deliver to the Mail 

address 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 +39–0331–225074; fax +39– 

0331–229046; or at https://

customerportal.leonardocompany.com/ 

en-US/. You may view this service 

information at the FAA, Office of the 

Regional Counsel, Southwest Region, 

10101 Hillwood Pkwy., Room 6N–321, 

Fort Worth, TX 76177. For information 

on the availability of this material at the 

FAA, call (817) 222–5110. 

Examining the AD Docket 

You may examine the AD docket at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2021–0579; 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, Policy & 

Innovation Division, FAA, 10101 

Hillwood Pkwy., Fort Worth, TX 76177; 

telephone (817) 222–5110; 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. 

FAA–2021–0579; Project Identifier 

MCAI–2020–00267–R’’ 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 http://

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 


jbell on DSKJLSW7X2PROD with PROPOSALS
Federal Register / Vol. 86, No. 140 / Monday, July 26, 2021 / Proposed Rules 39985 

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 Rao Edupuganti, 

Aerospace Engineer, Dynamic Systems 

Section, Technical Innovation Policy 

Branch, Policy & Innovation Division, 

FAA, 10101 Hillwood Pkwy., Fort 

Worth, TX 76177; telephone (817) 222– 

5110; 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 

EASA, which is the Technical Agent 

for the Member States of the European 

Union, issued EASA AD 2019–0036, 

dated February 15, 2019 (EASA AD 

2019–0036), to correct an unsafe 

condition for all serial-numbered 

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 AB139 and AW139 

helicopters. EASA advises that an 

occurrence was reported of a cracked 

MGB lock nut part number (P/N) 

3G6310A09151, which is used to keep 

the planetary gears in position. EASA 

AD 2019–0036 required replacing each 

MGB lock nut with an airworthy MGB 

lock nut. EASA advised this condition, 

if not detected and corrected, could lead 

to failure of the MGB planetary gears, 

resulting in loss of control of the 

helicopter. 

After EASA issued EASA AD 2019– 

0036, an additional occurrence was 

reported of a cracked MGB lock nut P/ 

N 3G6320A09151. Accordingly, EASA 

superseded EASA AD 2019–0036 with 

EASA AD 2019–0174, dated July 18, 

2019 (EASA AD 2019–0174), which 

retained the requirements of EASA AD 

2019–0036 but reduced the compliance 

times. After EASA issued EASA AD 

2019–0174, Leonardo Helicopters issued 

Alert Service Bulletin (ASB) No. 139– 

609, dated December 18, 2019 to 

provide instructions for replacing the 

affected MGB lock nut with MGB lock 

nut P/N 3G6320A09152, which has a 

redesigned flange reducing the stress at 

the bearing nut locations where cracks 

were detected. 

Accordingly, EASA then issued EASA 

AD 2020–0011, dated January 29, 2020, 

and corrected January 30, 2020 (EASA 

AD 2020–0011), which superseded 

EASA AD 2019–0174, and partially 

retained the requirements of EASA AD 

2019–0174. EASA AD 2020–0011 

revised the compliance times in EASA 

AD 2019–0174; required replacing each 

affected MGB lock nut with a newly 

designed MGB lock nut and prohibited 

installing an affected MGB on any 

helicopter. After EASA issued EASA AD 

2020–0011, EASA identified that certain 

MGB part numbers were inadvertently 

categorized incorrectly and therefore 

listed in the wrong group of helicopters. 

Accordingly, EASA issued EASA AD 

2020–0011R1, dated November 20, 2020 

(EASA AD 2020–011R1), revising EASA 

AD 2020–0011. EASA AD 2020–0011R1 

retains the requirements of EASA AD 

2020–0011 and corrects Appendix 1 of 

EASA AD 2020–0011. 

After EASA issued EASA AD 2020– 

0011R1, Leonardo Helicopters issued 

ASB No. 139–609, Revision A, dated 

April 13, 2021 (ASB 139–609 Rev A), 

which identifies an additional partnumbered MGB, which is also affected 

by the unsafe condition. Accordingly, 

EASA superseded EASA AD 2020– 

0011R1 with EASA AD 2021–0121, 

dated May 4, 2021 (EASA AD 2021– 

0121). EASA AD 2021–0121 adds an 

additional part-numbered MGB with a 

certain S/N to the list of affected parts. 

EASA AD 2021–0121 retains the 

requirements of EASA AD 2020– 

0011R1, and corrects Table 1 and 

Appendix 1 of EASA AD 2020–0011R1. 

FAA’s Determination 

These helicopters have been approved 

by EASA and are approved for operation 

in the United States. Pursuant to the 

FAA’s bilateral agreement with the 

European Union, EASA has notified the 

FAA about the unsafe condition 

described in its AD. The FAA is 

proposing this AD after evaluating all 

known relevant information and 

determining that an unsafe condition is 

likely to exist or develop on other 

helicopters of the same type designs. 

Related Service Information Under 1 

CFR Part 51 

The FAA reviewed ASB 139–609 Rev 

A, which specifies procedures for 

replacing an affected MGB lock nut with 

the new MGB lock nut, within certain 

compliance times for certain partnumbered MGBs, with certain serial 

numbers. 

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 the ADDRESSES section. 

Other Related Service Information 

The FAA also reviewed Leonardo 

Helicopters ASB No. 139–567, Revision 

B, dated October 18, 2019, which 

provides additional information for 

replacing the MGB lock nut. 

Proposed AD Requirements 

This proposed AD would require 

within 100 hours time in service (TIS) 

or during the next scheduled MGB 

overhaul, whichever occurs first after 

the effective date of this AD, removing 

a certain part-numbered MGB lock nut 

from service and replacing it with a new 

part-numbered MGB lock nut. This 

proposed AD would prohibit installing 

an MGB having an affected MGB lock 

nut and also prohibit installing an 

affected MGB lock nut on any helicopter 

as of the effective date of the proposed 

AD. 

Differences Between This Proposed AD 

and the EASA AD 

EASA AD 2021–0121 requires a 

compliance time based on number of 

landings, whereas this proposed AD 

would require a compliance time based 

on hours TIS. The service information 

referenced in EASA AD 2021–0121 

requires submitting certain information 

and parts to Leonardo, whereas this 

proposed AD would not. EASA AD 

2021–0121 applies to all serialnumbered Model AB139 and AW139 

helicopters, whereas this proposed AD 

would only apply to Model AB139 and 

AW139 helicopters without certain partnumbered MGB lock nuts installed and 

with certain part-numbered MGBs 

installed. 

Costs of Compliance 

The FAA estimates that this AD, if 

adopted as proposed, would affect 130 

helicopters of U.S. Registry. Labor rates 

are estimated at $85 per work-hour. 

Based on these numbers, the FAA 

estimates the following costs to comply 

with this proposed AD. 

Replacing each affected MGB lock nut 

with a newly designed MGB lock nut 

would take about 190 work-hours 

(during next MGB overhaul) and parts 

would cost about $7,600 for an 

estimated cost of $23,750 per 

replacement. 

Authority for This Rulemaking 

Title 49 of the United States Code 

specifies the FAA’s 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 Agency’s 

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 


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39986 Federal Register / Vol. 86, No. 140 / Monday, July 26, 2021 / Proposed Rules 

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, 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. 

List of Subjects in 14 CFR Part 39 

Air transportation, Aircraft, Aviation 

safety, Incorporation by reference, 

Safety. 

The Proposed Amendment 

Accordingly, under the authority 

delegated to me by the Administrator, 

the FAA proposes to amend 14 CFR part 

39 as follows: 

PART 39—AIRWORTHINESS 

DIRECTIVES 

■ 1. The authority citation for part 39 

continues to read as follows: 

Authority: 49 U.S.C. 106(g), 40113, 44701. 

§ 39.13 [Amended] 

■ 2. The FAA amends § 39.13 by adding 

the following new airworthiness 

directive: 

Leonardo S.p.a.: Docket No. FAA–2021– 

0579; Project Identifier MCAI–2020– 

00267–R. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) by September 9, 

2021. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to Leonardo S.p.a. Model 

AB139 and AW139 helicopters, certificated 

in any category, without main gearbox (MGB) 

spherical bearing lock nut (lock nut) part 

number (P/N) 3G6320A09152 installed and 

with: 

(1) MGB P/N 3G6320A00131, 

3G6320A00132, 3G6320A00133, 

3G6320A00134, 3G6320A00135, 

3G6320A00136, 3G6320A22031, 

4G6320A00132, or 4G6320A00133 installed, 

or 

(2) MGB P/N 3G320A00133 with serial 

number (S/N) M23, or MGB P/N 

3G6320A00134, with S/N M6, N76, N92, 

P124, P129, P131, P162, P184, Q230, Q243, 

Q249, R272, V21, V39, V96, V163, V211, 

V241, V272, V281, V384, V386, or V622 

installed, or 

(3) MGB P/N 3G6320A00136 with S/N 

AW1, AW2, AW3, AW5, or AW10 installed. 

(d) Subject 

Joint Aircraft Service Component (JASC) 

Code: 6320, Main Rotor Gearbox. 

(e) Unsafe Condition 

This AD was prompted by a cracked MGB 

lock nut. The FAA is issuing this AD to 

replace an affected MGB lock nut with a new 

MGB lock nut. The unsafe condition, if not 

addressed, could result in failure of the MGB 

planetary gears, resulting in loss of control of 

the helicopter. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Required Actions 

(1) Within 100 hours time-in-service, or 

during the next scheduled MGB overhaul, 

whichever occurs first after the effective date 

of this AD, remove each MGB lock nut P/N 

3G6320A09151 from service and replace with 

MGB lock nut P/N 3G6320A09152 in 

accordance with Annex A, steps 1 through 

17, of Leonardo Helicopters Alert Service 

Bulletin No. 139–609, Revision A, dated 

April 13, 2021 (ASB 139–609, Rev A), except 

you are not required to send parts to 

Leonardo Helicopters. 

Note to paragraph (g)(1): Leonardo 

Helicopters service information refers to an 

MGB lock nut as a ring nut. 

(2) As of the effective date of this AD, do 

not install any MGB having MGB lock nut P/ 

N 3G630A09151 on any helicopter, and do 

not install any MGB lock nut P/N 

3G630A09151 on any helicopter. 

(h) Special Flight Permits 

Special flight permits are prohibited. 

(i) 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 (j)(1) 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. 

(j) Related Information 

(1) For more information about this AD, 

contact Rao Edupuganti, Aerospace Engineer, 

Dynamic Systems Section, Technical 

Innovation Policy Branch, Policy & 

Innovation Division, FAA, 10101 Hillwood 

Pkwy., Fort Worth, TX 76177; telephone 

(817) 222–5110; email rao.edupuganti@

faa.gov. 

(2) For service information identified in 

this AD, contact Leonardo S.p.A. Helicopters, 

Emanuele Bufano, Head of Airworthiness, 

Viale G.Agusta 520, 21017 C.Costa di 

Samarate (Va) Italy; telephone +39–0331– 

225074; fax +39–0331–229046; or at https:// 

customerportal.leonardocompany.com/enUS/. You may view this referenced service 

information at the FAA, Office of the 

Regional Counsel, Southwest Region, 10101 

Hillwood Pkwy., Room 6N–321, Fort Worth, 

TX 76177. For information on the availability 

of this material at the FAA, call (817) 222– 

5110. 

(3) The subject of this AD is addressed in 

European Union Aviation Safety Agency 

(EASA) AD 2021–0121, dated May 4, 2021. 

You may view the EASA AD on the internet 

at https://www.regulations.gov in Docket No. 

FAA–2021–0579. 

Issued on July 20, 2021. 

Gaetano A. Sciortino, 

Deputy Director for Strategic Initiatives, 

Compliance & Airworthiness Division, 

Aircraft Certification Service. 

[FR Doc. 2021–15722 Filed 7–23–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 71 

[Docket No. FAA–2020–0896; Airspace 

Docket No. 20–ANM–17] 

RIN 2120–AA66 

Proposed Modification of Class D 

Airspace; McChord Field (Joint Base 

Lewis-McChord), WA; Supplemental 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Supplemental notice of 

proposed rulemaking (SNPRM). 

SUMMARY: This action proposes to 

modify the Class D airspace at McChord 

Field (Joint Base Lewis-McChord), 

Tacoma, WA. After a review of the 

airspace, the FAA found it necessary to 

amend the existing airspace for the 

safety and management of Instrument 

Flight Rules (IFR) operations at this 

location and Visual Flight Rules (VFR) 

at a satellite airport. This proposal 

would also remove a reference to the 

McChord Very High Frequency 


jbell on DSKJLSW7X2PROD with PROPOSALS