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Federal Register / Vol. 86, No. 42 / Friday, March 5, 2021 / Rules and Regulations disk and replace with a part that is eligible for installation.
2 For affected Safran Helicopter Engines Astazou XIV B and Astazou XIV H model turboshaft engines, within 25 FHs after the effective date of this AD, remove from service the Stage 3 turbine wheel and replace with a part that is eligible for installation.

The Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows:
PART 39AIRWORTHINESS
DIRECTIVES

h Definitions
1. The authority citation for part 39
continues to read as follows:

Authority: 49 U.S.C. 106g, 40113, 44701.
39.13

Amended
2. The FAA amends 39.13 by adding the following new airworthiness directive:

20210522 Safran Helicopter Engines, S.A. Type Certificate previously held by Turbomeca, S.A.: Amendment 39
21466; Docket No. FAA20210132;
Project Identifier MCAI202000947E.
a Effective Date This airworthiness directive AD is effective March 22, 2021.

i Alternative Methods of Compliance AMOCs
b Affected ADs None.
c Applicability This AD applies to Safran Helicopter Engines Type Certificate previously held by Turbomeca, S.A.:
1 Arriel 1B, Arriel 1C, Arriel 1C2, and Arriel 1D1 model turboshaft engines with a Stage 2 HPT disk part number P/N
0292250400 and serial number S/N J915AD, J918AD, J919AD, J921AD, J923AD, J924AD, J926AD or J927AD, installed; and 2 Astazou XIV B and Astazou XIV H
model turboshaft engines with a Stage 3
turbine wheel P/N 0256257050 and S/N
J276AD, J278AD, J279AD, J281AD, J282AD, J283AD or J287AD, installed.
d Subject Joint Aircraft System Component JASC
Code 7250, Turbine Section.

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f Compliance Comply with this AD within the compliance times specified, unless already done.
g Required Actions 1 For affected Safran Helicopter Engines Arriel 1B, Arriel 1C, Arriel 1C2 and Arriel 1D1 model turboshaft engines, within 25
flight hours FHs after the effective date of this AD, remove from service the Stage 2 HPT

15:52 Mar 04, 2021

Jkt 253001

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 ECO Branch, 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
e Unsafe Condition This AD was prompted by the detection of positive segregation freckles on Stage 2
high-pressure turbine HPT disks and Stage 3 turbine wheels manufactured from a certain block of material. The FAA is issuing this AD
to prevent failure of the HPT disk. The unsafe condition, if not addressed, could result in failure of the Stage 2 HPT disk and Stage 3
turbine wheels, uncontained release of these parts, damage to the helicopter, and reduced control of the helicopter.

VerDate Sep<11>2014

1 For the purpose of this AD, a part eligible for installation on Safran Helicopter Engines Arriel 1B, Arriel 1C, Arriel 1C2, and Arriel 1D1 model turboshaft engines is a Stage 2 HPT disk that does not have P/N
0292250400 and S/N J915AD, J918AD, J919AD, J921AD, J923AD, J924AD, J926AD or J927AD.
2 For the purpose of this AD, a part that is eligible for installation on Safran Helicopter Engines Astazou XIV B and Astazou XIV H model turboshaft engines is a Stage 3 turbine wheel that does not have P/N 0265257050 and S/N J276AD, J278AD, J279AD, J281AD, J282AD, J283AD, or J287AD.

1 For more information about this AD, contact Wego Wang, Aviation Safety Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone: 781
2387134; fax: 781 2387199; email:
wego.wang@faa.gov.
2 Refer to European Union Aviation Safety Agency EASA AD 20200151E, dated July 9, 2020, and EASA AD 2020
0161E, dated July 17, 2020, for more information. You may examine the EASA
ADs in the AD docket at https
www.regulations.gov by searching for and locating Docket No. FAA20210132.
k Material Incorporated by Reference None.
Issued on February 26, 2021.
Gaetano A. Sciortino, Deputy Director for Strategic Initiatives, Compliance & Airworthiness Division, Aircraft Certification Service.
FR Doc. 202104454 Filed 3421; 8:45 am BILLING CODE 491013P

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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210133; Project Identifier AD202100234T; Amendment 3921469; AD 20210603
RIN 2120AA64

Airworthiness Directives; The Boeing Company Airplanes Federal Aviation Administration FAA, DOT.
ACTION: Final rule; request for comments.
AGENCY:

The FAA is adopting a new airworthiness directive AD for all The Boeing Company Model 777F series airplanes. This AD was prompted by a report of a water supply line that detached at a certain joint located above an electronic equipment EE cooling filter, leading to water intrusion into the forward EE bay. This AD requires deactivating the potable water system.
The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective March 5, 2021.
The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD
as of March 5, 2021.
The FAA must receive comments on this AD by April 19, 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: 2024932251.
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 final rule, contact Boeing Commercial Airplanes, Attention:
Contractual & Data Services C&DS, 2600 Westminster Blvd., MC 110SK57, Seal Beach, CA 907405600; telephone 5627971717; internet https
www.myboeingfleet.com. You may view this service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 2200 South 216th St., Des Moines, WA. For information on the availability of this SUMMARY:

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