Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG (Type Certificate Previously Held by Rolls-Royce plc) Turbofan Engines

CourtFederal Aviation Administration
Citation87 FR 9425
Published date22 February 2022
Record Number2022-03638
Federal Register, Volume 87 Issue 35 (Tuesday, February 22, 2022)
[Federal Register Volume 87, Number 35 (Tuesday, February 22, 2022)]
                [Rules and Regulations]
                [Pages 9425-9427]
                From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
                [FR Doc No: 2022-03638]
                ========================================================================
                Rules and Regulations
                 Federal Register
                ________________________________________________________________________
                This section of the FEDERAL REGISTER contains regulatory documents
                having general applicability and legal effect, most of which are keyed
                to and codified in the Code of Federal Regulations, which is published
                under 50 titles pursuant to 44 U.S.C. 1510.
                The Code of Federal Regulations is sold by the Superintendent of Documents.
                ========================================================================
                Federal Register / Vol. 87, No. 35 / Tuesday, February 22, 2022 /
                Rules and Regulations
                [[Page 9425]]
                DEPARTMENT OF TRANSPORTATION
                Federal Aviation Administration
                14 CFR Part 39
                [Docket No. FAA-2021-0662; Project Identifier MCAI-2021-00031-E;
                Amendment 39-21943; AD 2022-04-02]
                RIN 2120-AA64
                Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG
                (Type Certificate Previously Held by Rolls-Royce plc) Turbofan Engines
                AGENCY: Federal Aviation Administration (FAA), DOT.
                ACTION: Final rule.
                -----------------------------------------------------------------------
                SUMMARY: The FAA is adopting a new airworthiness directive (AD) for
                certain Rolls-Royce Deutschland Ltd & Co KG (RRD) Trent 1000 model
                turbofan engines. This AD was prompted by reports of high levels of
                wear on the seal fins on a small number of certain high-pressure
                turbine triple seals. This AD requires manual deactivation of the
                modulated air system (MAS) control valves. The FAA is issuing this AD
                to address the unsafe condition on these products.
                DATES: This AD is effective March 29, 2022.
                 The Director of the Federal Register approved the incorporation by
                reference of a certain publication listed in this AD as of March 29,
                2022.
                ADDRESSES: For service information identified in this final rule,
                contact Rolls-Royce plc, Corporate Communications, P.O. Box 31, Derby,
                DE24 8BJ, United Kingdom; phone: +44 (0)1332 242424; fax: +44 (0)1332
                249936; website: https://www.rolls-royce.com/contact-us.aspx. You may
                view this 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 (817) 222-5110. It is also available at https://www.regulations.gov by searching for and locating Docket No. FAA-2021-
                0662.
                Examining the AD Docket
                 You may examine the AD docket at https://www.regulations.gov by
                searching for and locating Docket No. FAA-2021-0662; 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
                mandatory continuing airworthiness information (MCAI), any comments
                received, and other information. The address for Docket Operations is
                U.S. Department of Transportation, Docket Operations, M-30, West
                Building Ground Floor, Room W12-140, 1200 New Jersey Avenue SE,
                Washington, DC 20590.
                FOR FURTHER INFORMATION CONTACT: Kevin Clark, Aviation Safety Engineer,
                ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone:
                (781) 238-7088; fax: (781) 238-7199; email: [email protected].
                SUPPLEMENTARY INFORMATION:
                Background
                 The FAA issued a supplemental notice of proposed rulemaking (SNPRM)
                to amend 14 CFR part 39 by adding an AD that would apply to certain RRD
                (Type Certificate previously held by Rolls-Royce plc) Trent 1000-AE3,
                Trent 1000-CE3, Trent 1000-D3, Trent 1000-G3, Trent 1000-H3, Trent
                1000-J3, Trent 1000-K3, Trent 1000-L3, Trent 1000-M3, Trent 1000-N3,
                Trent 1000-P3, Trent 1000-Q3, and Trent 1000-R3 model turbofan engines.
                The SNPRM published in the Federal Register on November 05, 2021 (86 FR
                61083). The SNPRM was prompted by the notice of proposed rulemaking
                (NPRM) being placed in incorrect Docket No. FAA-2021-0637 instead of
                Docket No. FAA-2021-0662, which caused some commenters to experience
                difficulty commenting on the NPRM. In the SNPRM, the FAA proposed to
                require manual deactivation of the MAS control valves. The FAA is
                issuing this AD to address the unsafe condition on these products.
                 The European Union Aviation Safety Agency (EASA), which is the
                Technical Agent for the Member States of the European Union, has issued
                EASA AD 2021-0009, dated January 8, 2021 (referred to after this as
                ``the MCAI''), to address the unsafe condition on these products. The
                MCAI states:
                 The Modulated Air System (MAS) optimises cooling air, extracted
                from the compressor, where full flow is not required at cruise
                conditions. It is only active during cruise. Recently, occurrences
                have been reported of finding high levels of wear on the seal fins
                on a small number of high pressure turbine triple seals, Part Number
                FW34485. The effect on the secondary air system was conservatively
                assessed due to the resultant increased turbine cooling air leakage,
                which changes the cooling flow around the intermediate pressure (IP)
                turbine disc.
                 This condition, if not corrected, could lead to temperature
                increase at the IP turbine disc rim when the MAS is active, possibly
                resulting in IP turbine disc failure and high energy debris release,
                with consequent damage to, and reduced control of, the aeroplane. To
                address this potential unsafe condition, Rolls-Royce has issued the
                NMSB, providing instructions to manually `lock-out' (deactivate) the
                MAS control valves.
                 For the reason described above, this [EASA] AD requires to
                deactivate the MAS control valves. This [EASA] AD also specifies
                that the Master Minimum Equipment List (MMEL) item for `MAS
                inoperative', which has a limit of 120 days, does not apply when the
                system is manually deactivated.
                 You may obtain further information by examining the MCAI in the AD
                docket at https://www.regulations.gov by searching for and locating
                Docket No. FAA-2021-0662.
                Discussion of Final Airworthiness Directive
                Comments
                 The FAA received a comment from one commenter, Roll-Royce plc (RR).
                The following presents the comment received on the SNPRM and the FAA's
                response to the comment.
                Request To Consider Improved Solution as a Terminating Action
                 RR stated that it has no objections to the SNPRM as written but
                requested that the FAA consider an improved solution that is being
                developed by RR as a terminating action for this AD. RR noted that the
                improved solution would permanently deactivate the MAS system without
                initiating engine indicating and crew alerting system (EICAS) messages.
                RR reasoned that deactivation of the MAS was introduced as an immediate
                containment action; however, this solution produces spurious EICAS
                messages, indicating a malfunction in
                [[Page 9426]]
                the MAS system. As a result, operators are instructed not to follow the
                minimum equipment list instructions and limitations.
                 The FAA will consider the improved solution as a possible
                terminating action and may consider future rulemaking once the improved
                solution becomes available. The FAA did not change this AD as a result
                of this comment.
                Conclusion
                 The FAA reviewed the relevant data, considered the comment
                received, and determined that air safety and the public interest
                require adopting this AD as proposed. Accordingly, the FAA is issuing
                this AD to address the unsafe condition on these products. This AD is
                adopted as proposed in the SNPRM.
                Related Service Information Under 1 CFR Part 51
                 The FAA reviewed Rolls-Royce Alert Non-Modification Service
                Bulletin Trent 1000 75-AK642, Initial Issue, dated November 30, 2020.
                The service information specifies procedures for deactivating the MAS
                control valves. 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 ADDRESSES.
                Costs of Compliance
                 The FAA estimates that this AD affects 4 engines installed on
                airplanes of U.S. registry.
                 The FAA estimates the following costs to comply with this AD:
                 Estimated Costs
                ----------------------------------------------------------------------------------------------------------------
                 Cost per Cost on U.S.
                 Action Labor cost Parts cost product operators
                ----------------------------------------------------------------------------------------------------------------
                Deactivate the MAS control valves..... 2 work-hours x $85 per $0 $170 $680
                 hour = $170.
                ----------------------------------------------------------------------------------------------------------------
                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 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
                 This AD will not have federalism implications under Executive Order
                13132. This AD will 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 above, I certify this AD:
                 (1) Is not a ``significant regulatory action'' under Executive
                Order 12866,
                 (2) Will not affect intrastate aviation in Alaska, and
                 (3) Will 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 Amendment
                 Accordingly, under the authority delegated to me by the
                Administrator, the FAA amends 14 CFR part 39 as follows:
                PART 39--AIRWORTHINESS DIRECTIVES
                0
                1. The authority citation for part 39 continues to read as follows:
                 Authority: 49 U.S.C. 106(g), 40113, 44701.
                Sec. 39.13 [Amended]
                0
                2. The FAA amends Sec. 39.13 by adding the following new airworthiness
                directive:
                2022-04-02 Rolls-Royce Deutschland Ltd & Co KG (Type Certificate
                previously held by Rolls-Royce plc): Amendment 39-21943; Docket No.
                FAA-2021-0662; Project Identifier MCAI-2021-00031-E.
                (a) Effective Date
                 This airworthiness directive (AD) is effective March 29, 2022.
                (b) Affected ADs
                 None.
                (c) Applicability
                 This AD applies to Rolls-Royce Deutschland Ltd & Co KG (RRD)
                (Type Certificate previously held by Rolls-Royce plc) Trent 1000-
                AE3, Trent 1000-CE3, Trent 1000-D3, Trent 1000-G3, Trent 1000-H3,
                Trent 1000-J3, Trent 1000-K3, Trent 1000-L3, Trent 1000-M3, Trent
                1000-N3, Trent 1000-P3, Trent 1000-Q3, and Trent 1000-R3 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 triple
                seals. The FAA is issuing this AD to ensure cooling airflow
                restoration to the intermediate-pressure turbine (IPT) disk rim
                during cruise by deactivating the modulated air system (MAS). The
                unsafe condition, if not addressed, could result in a temperature
                increase at the IPT disk rim when the MAS is active during cruise,
                resulting in failure of the IPT 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 MAS control valves using the
                Accomplishment Instructions, paragraphs 3.A.(6) and 3.A.(7), of
                Rolls-Royce Alert Non-Modification Service Bulletin 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 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
                operator's existing FAA-approved 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
                [[Page 9427]]
                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.
                [GRAPHIC] [TIFF OMITTED] TR22FE22.000
                (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
                ECO Branch, send it to the attention of the person identified in
                paragraph (i)(1) of this AD and email to: [email protected].
                 (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.
                (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) 238-7088; fax: (781) 238-7199;
                email: [email protected].
                 (2) Refer to European Union Aviation Safety Agency (EASA) AD
                2021-0009, dated January 8, 2021, for more information. You may
                examine the EASA AD in the AD docket at https://www.regulations.gov
                by searching for and locating Docket No. FAA-2021-0662.
                (j) Material Incorporated by Reference
                 (1) The Director of the Federal Register approved the
                incorporation by reference (IBR) of the service information listed
                in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51.
                 (2) You must use this service information as applicable to do
                the actions required by this AD, unless the AD specifies otherwise.
                 (i) Rolls-Royce Alert Non-Modification Service Bulletin Trent
                1000 75-AK642, Initial Issue, dated November 30, 2020.
                 (ii) [Reserved]
                 (3) For Rolls-Royce service information identified in this AD,
                contact Rolls-Royce plc, Corporate Communications, P.O. Box 31,
                Derby, DE24 8BJ, United Kingdom; phone: +44 (0)1332 242424; fax: +44
                (0)1332 249936; website: https://www.rolls-royce.com/contact-us.aspx.
                 (4) You may view this service information at 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 (817) 222-5110.
                 (5) You may view this service information that is incorporated
                by reference at the National Archives and Records Administration
                (NARA). For information on the availability of this material at
                NARA, email: [email protected], or go to: https://www.archives.gov/federal-register/cfr/ibr-locations.html.
                 Issued on February 3, 2022.
                Lance T. Gant,
                Director, Compliance & Airworthiness Division, Aircraft Certification
                Service.
                [FR Doc. 2022-03638 Filed 2-18-22; 8:45 am]
                BILLING CODE 4910-13-P
                

VLEX uses login cookies to provide you with a better browsing experience. If you click on 'Accept' or continue browsing this site we consider that you accept our cookie policy. ACCEPT