[Federal Register Volume 88, Number 131 (Tuesday, July 11, 2023)]
[Rules and Regulations]
[Pages 44037-44040]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2023-14596]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2023-0660; Project Identifier MCAI-2022-01561-E; 
Amendment 39-22474; AD 2023-12-16]
RIN 2120-AA64


Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG 
Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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[[Page 44038]]

SUMMARY: The FAA is adopting a new airworthiness directive (AD) for 
certain Rolls-Royce Deutschland Ltd & Co KG (RRD) Model Trent 1000 
engines. This AD was prompted by reports of excessive wear on the inner 
seal fins of certain high-pressure turbine (HPT) triple seals. This AD 
requires an inspection of the HPT triple seal for excessive wear and, 
depending on the results of the inspection, replacement of the HPT 
triple seal and the intermediate-pressure turbine (IPT) disk, as 
specified in a European Union Aviation Safety Agency (EASA) AD, which 
is incorporated by reference. The FAA is issuing this AD to address the 
unsafe condition on these products.

DATES: This AD is effective August 15, 2023.
    The Director of the Federal Register approved the incorporation by 
reference of a certain publication listed in this AD as of August 15, 
2023.

ADDRESSES: 
    AD Docket: You may examine the AD docket at regulations.gov under 
Docket No. FAA-2023-0660; 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.
    Material Incorporated by Reference:
     For the EASA AD identified in this final rule, contact 
EASA, Konrad-Adenauer-Ufer 3, 50668 Cologne, Germany; phone: +49 221 
8999 000; email: [email protected]; website: easa.europa.eu. You may 
find this material on the EASA website at ad.easa.europa.eu.
     You may view this EASA AD 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 
regulations.gov under Docket No. FAA-2023-0660.

FOR FURTHER INFORMATION CONTACT: Sungmo Cho, Aviation Safety Engineer, 
FAA, 2200 South 216th Street, Des Moines, WA 98198; phone: (781) 238-
7241; email: [email protected].

SUPPLEMENTARY INFORMATION:

Background

    The FAA issued a notice of proposed rulemaking (NPRM) to amend 14 
CFR part 39 by adding an AD that would apply to certain RRD Model 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 engines. The NPRM 
published in the Federal Register on April 7, 2023 (88 FR 20782). The 
NPRM was prompted by EASA AD 2022-0241, dated December 7, 2022, issued 
by EASA, which is the Technical Agent for the Member States of the 
European Union (EASA AD 2022-0241) (referred to after this as the 
MCAI). The MCAI states that occurrences have been reported of finding 
higher than expected levels of wear on the seal fins of certain HPT 
triple seals. The secondary air system is affected by the resulting 
increased turbine cooling air leakage, which changes the air flow 
around the IPT disk. The Modulated Air System (MAS) was designed to 
optimize cooling air flow and intended to be active only during cruise 
conditions, but the design did not account for a high level of seal 
wear. Rolls-Royce issued Non-Modification Service Bulletin Trent 1000 
75-AK642, Initial Issue, dated November 30, 2020, to provide 
instructions for MAS deactivation, and consequently, EASA published 
EASA AD 2021-0009, dated January 8, 2021, specifying deactivation of 
the MAS control valves. Despite this, a significantly worn HPT triple 
seal under flight conditions, while MAS was activated prior to the 
above action, could have reduced the safety of flight.
    In the NPRM, the FAA proposed to require accomplishing the actions 
specified in EASA AD 2022-0241 described previously, except for any 
differences identified as exceptions in the regulatory text of this AD. 
The FAA is issuing this AD to address the unsafe condition on these 
products.
    You may examine the MCAI in the AD docket at regulations.gov under 
Docket No. FAA-2023-0660.

Discussion of Final Airworthiness Directive

Comments

    The FAA received a comment from one commenter, The Boeing Company 
(Boeing). Boeing supported the NPRM without change.

Conclusion

    These products have been approved by the aviation authority of 
another country and are approved for operation in the United States. 
Pursuant to the FAA's bilateral agreement with this State of Design 
Authority, it has notified the FAA of the unsafe condition described in 
the MCAI referenced above. The FAA reviewed the relevant data, 
considered the comment received, and determined that air safety 
requires adopting the AD as proposed. Accordingly, the FAA is issuing 
this AD to address the unsafe condition on these products. Except for 
minor editorial changes, this AD is adopted as proposed in the NPRM.

Related Service Information Under 1 CFR Part 51

    The FAA reviewed EASA AD 2022-0241. EASA AD 2022-0241 specifies 
procedures for inspecting the HPT triple seal for excessive wear and, 
depending on the results of the inspection, replacing the HPT triple 
seal and the IPT disk. 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
----------------------------------------------------------------------------------------------------------------
Inspect HPT triple seal.............  1 work-hour x $85 per                $0              $85             $340
                                       hour = $85.
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    The FAA estimates the following costs to do any necessary 
replacements that would be required based on the results of the 
inspection. The agency has no way of determining the number of aircraft 
that might need these replacements:

[[Page 44039]]



                                               On-Condition Costs
----------------------------------------------------------------------------------------------------------------
                                                                                                     Cost per
                    Action                                Labor cost               Parts cost        product
----------------------------------------------------------------------------------------------------------------
Replace HPT triple seal and IPT disk.........  4 work-hours x $85 per hour =          $737,832         $738,172
                                                $340.
----------------------------------------------------------------------------------------------------------------

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 that 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:

2023-12-16 Rolls-Royce Deutschland Ltd & Co KG: Amendment 39-22474; 
Docket No. FAA-2023-0660; Project Identifier MCAI-2022-01561-E.

(a) Effective Date

    This airworthiness directive (AD) is effective August 15, 2023.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to certain Rolls-Royce Deutschland Ltd & Co KG 
(RRD) Model 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 engines, as identified in European Union Aviation 
Safety Agency (EASA) AD 2022-0241, dated December 7, 2022 (EASA AD 
2022-0241).

(d) Subject

    Joint Aircraft System Component (JASC) Code 7240, Turbine Engine 
Combustion Section.

(e) Unsafe Condition

    This AD was prompted by reports of excessive wear on the inner 
seal fins of certain high-pressure turbine (HPT) triple seals. The 
FAA is issuing this AD to prevent excessive wear on the inner seal 
fins of certain HPT triple seals. The unsafe condition, if not 
addressed, could lead to a temperature increase at the intermediate-
pressure turbine (IPT) disk rim, possibly resulting in IPT disk 
failure and high energy debris release, with consequent damage to 
the airplane and reduced control of the airplane.

(f) Compliance

    Comply with this AD within the compliance times specified, 
unless already done.

(g) Required Actions

    Except as specified in paragraphs (h) and (i) of this AD: 
Perform all required actions within the compliance times specified 
in, and in accordance with, EASA AD 2022-0241.

(h) Exceptions to EASA AD 2022-0241

    (1) Where EASA AD 2022-0241 refers to its effective date, this 
AD requires using the effective date of this AD.
    (2) This AD does not adopt the Remarks paragraph of EASA AD 
2022-0241.

(i) No Reporting Requirement

    Although EASA AD 2022-0241 specifies to submit inspection 
results to the manufacturer, this AD does not include that 
requirement.

(j) Alternative Methods of Compliance (AMOCs)

    (1) The Manager, AIR-520, Continued Operational Safety 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 branch office, send it to 
the attention of the person identified in paragraph (k) 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.

(k) Additional Information

    For more information about this AD, contact Sungmo Cho, Aviation 
Safety Engineer, FAA, 2200 South 216th Street, Des Moines, WA 98198; 
phone: (781) 238-7241; email: [email protected].

(l) Material Incorporated by Reference

    (1) The Director of the Federal Register approved the 
incorporation by reference 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) European Union Aviation Safety Agency AD 2022-0241, dated 
December 7, 2022.
    (ii) [Reserved]
    (3) For EASA AD 2022-0241, contact EASA, Konrad-Adenauer-Ufer 3, 
50668 Cologne, Germany; phone: +49 221 8999 000; email: 
[email protected]; website: easa.europa.eu. You may find this 
material on the EASA website at ad.easa.europa.eu.
    (4) 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. This 
material may be found in the AD docket at regulations.gov by 
searching for and locating Docket No. FAA-2023-0660.

[[Page 44040]]

    (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: www.archives.gov/federal-register/cfr/ibr-locations.html.

    Issued on June 13, 2023.
Michael Linegang,
Acting Director, Compliance & Airworthiness Division, Aircraft 
Certification Service.
[FR Doc. 2023-14596 Filed 7-10-23; 8:45 am]
BILLING CODE 4910-13-P


