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Federal Register / Vol. 86, No. 154 / Friday, August 13, 2021 / Proposed Rules c Applicability This AD applies to Rolls-Royce Deutschland Ltd & Co KG RRD Type Certificate previously held by Rolls-Royce plc Trent 1000AE3, Trent 1000CE3, Trent 1000D3, Trent 1000G3, Trent 1000H3, Trent 1000J3, Trent 1000K3, Trent 1000
L3, Trent 1000M3, Trent 1000N3, Trent 1000P3, Trent 1000Q3, and Trent 1000R3
model turbofan engines.
d Subject Joint Aircraft System Component JASC
Code 7250, Turbine Section.
e Unsafe Condition This AD was prompted by reports of high levels of wear on the seal fins on a small number of certain high-pressure turbine HPT triple seals. The FAA is issuing this AD to prevent wear on the seal fins on the affected HPT triple seals. The unsafe condition, if not addressed, could result in
failure of the intermediate-pressure turbine disk, loss of engine thrust control, and loss of the airplane.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Required Actions Within the compliance time specified in figure 1 to paragraph g of this AD, deactivate the modulated air system MAS
control valves using the Accomplishment Instructions, paragraphs 3.A.6 and 3.A.7, of Rolls-Royce Alert Non-Modification Service Bulletin NMSB Trent 1000 75
AK642, Initial Issue, dated November 30, 2020.
Note 1 to paragraph g: Deactivation of the MAS control valves on an engine required by paragraph g of this AD changes the engine to an approved configuration that will produce engine indicating and crew alerting
44657

system EICAS status messages ENG MAS
VALVE L/R and ENG MAS SYS TEST L/
R. Since MAS is purposely disabled after compliance with paragraph g of this AD, these status messages do not indicate inoperative failed equipment and, consequently, the operators existing FAAapproved minimum equipment list MEL
instructions and limitations, including the 120-day operation limitation, do not apply.
Note 2 to paragraph g: Deactivation of the MAS control valves on an engine as required by paragraph g of this AD does not produce the EICAS status message ENG MAS VALVE
SENSOR L/R. Consequently, when this EICAS message displays, it remains indicative of inoperative equipment, even if the MAS has been disabled as required by paragraph g of this AD. As a result, the corresponding MEL instructions and limitations apply whenever the EICAS status message ENG MAS VALVE SENSOR L/R is displayed.

FIGURE 1 TO PARAGRAPH gCOMPLIANCE TIME
MAS deactivation option A
B

Compliance time, whichever occurs later after the effective date of this AD, A or B
Within 50 engine flight cycles FCs since new.
Within 30 days or 100 FCs, whichever occurs first.

h 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.
Information may be emailed to: ANE-ADAMOC@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 Kevin Clark, Aviation Safety Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone: 781
2387088; fax: 781 2387199; email:
kevin.m.clark@faa.gov.
2 For service information identified in this AD, contact Rolls-Royce plc, Corporate Communications, P.O. Box 31, Derby, DE24
8BJ, United Kingdom; phone: +44 01332
242424; fax: +44 01332 249936; website:
https www.rolls-royce.com/contact-us.aspx.
You may view this referenced service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 1200 District Avenue, Burlington, MA 01803.
For information on the availability of this material at the FAA, call 781 2387759.

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Issued on August 5, 2021.
Lance T. Gant, Director, Compliance & Airworthiness Division, Aircraft Certification Service.
FR Doc. 202117071 Filed 81221; 8:45 am BILLING CODE 491013P

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210659; Project Identifier 2018SW112AD
RIN 2120AA64

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

SUMMARY: The FAA proposes to adopt a new airworthiness directive AD for all Leonardo S.p.a. Model A109A, A109A
II, A109C, A109E, A109K2, A109S, AW109SP, A119, and AW119 MKII
helicopters. This proposed AD was prompted by a report of damage to a rigid connecting link rod, and loosening of the nut on the upper rod end. This proposed AD would require a visual inspection of the affected rods for damage, cracks, or abnormal play, and corrective actions if necessary, as
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specified in a European Aviation Safety Agency now European Union Aviation Safety Agency EASA AD, which is proposed for incorporation by reference IBR. The FAA is proposing this AD to address the unsafe condition on these products.
The FAA must receive comments on this proposed AD by September 27, 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, M30, 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 EASA material that is proposed for IBR in this AD, contact EASA, Konrad-Adenauer-Ufer 3, 50668
Cologne, Germany; phone: +49 221 8999
000; email: ADs@easa.europa.eu;
internet www.easa.europa.eu. You may find this IBR material on the EASA
website at https ad.easa.europa.eu.
You may view this material at the FAA, Office of the Regional Counsel, DATES:

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