
[Federal Register Volume 88, Number 186 (Wednesday, September 27, 2023)]
[Proposed Rules]
[Pages 66316-66319]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2023-21090]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2023-1889; Project Identifier MCAI-2023-00738-E]
RIN 2120-AA64


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

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Proposed rule; correction.

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SUMMARY: The FAA is correcting a Notice of Proposed Rulemaking (NPRM) 
that published in the Federal Register. The NPRM proposed to issue an 
airworthiness directive (AD) that would apply to certain Rolls-Royce 
Deutschland Ltd & Co KG (RRD) Model Trent 1000 engines. As published, 
the docket number referenced throughout the NPRM is incorrect. This 
document corrects that error. In all other respects, the original 
document remains the same; however, for clarity, the FAA is publishing 
the entire proposed rule in the Federal Register.

DATES: The last date for submitting comments to the NPRM (88 FR 63885, 
September 18, 2023) remains November 2, 2023.

ADDRESSES: You may send comments, using the procedures found in 14 CFR 
11.43 and 11.45, by any of the following methods:

[[Page 66317]]

     Federal eRulemaking Portal: Go to regulations.gov. Follow 
the instructions for submitting comments.
     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.
     Hand Delivery: Deliver to Mail address above between 9 
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
    AD Docket: You may examine the AD docket at regulations.gov under 
Docket No. FAA-2023-1889; 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 mandatory continuing airworthiness 
information (MCAI), any comments received, and other information. The 
street address for Docket Operations is listed above.
    Material Incorporated by Reference:
     For service information that is identified in this NPRM, 
contact the European Union Aviation Safety Agency (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. It is also available 
at regulations.gov under Docket No. FAA-2023-1889.
     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.

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:

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-2023-1889; Project Identifier 
MCAI-2023-00738-E'' 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 
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 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 
Sungmo Cho, Aviation Safety Engineer, FAA, 2200 South 216th Street, Des 
Moines, WA 98198. Any commentary that the FAA receives which is not 
specifically designated as CBI will be placed in the public docket for 
this rulemaking.

Background

    The FAA issued an NPRM (88 FR 63885, September 18, 2023) that would 
apply to certain RRD Model Trent 1000 engines. The NPRM proposed to 
supersede AD 2021-25-04, Amendment 39-21847 (86 FR 71129, December 15, 
2021) (AD 2021-25-04), for all 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 (Trent 1000) engines. AD 2021-25-04 
requires operators to revise the airworthiness limitations section 
(ALS) of their existing approved aircraft maintenance program by 
incorporating the revised tasks of the applicable time limits manual 
(TLM) for each affected engine.
    The NPRM proposed to require revising the ALS of the operator's 
existing approved engine maintenance or inspection program, as 
applicable, to incorporate new or more restrictive tasks and 
limitations and associated thresholds and intervals for life-limited 
parts, as specified in EASA AD 2023-0115, dated June 7, 2023 (EASA AD 
2023-0115) (also referred to after this as the MCAI), which is proposed 
for incorporation by reference. The NPRM was prompted by the 
manufacturer revising the TLM to introduce new or more restrictive 
tasks and limitations and associated thresholds and intervals for life-
limited parts. The FAA is proposing this AD to prevent the failure of 
critical rotating parts, which could result in the failure of one or 
more engines, loss of thrust control, and loss of the airplane.

Need for the Correction

    As published, the docket number referenced throughout the NPRM is 
incorrect. The NPRM incorrectly references ``Docket No. FAA-2023-1881'' 
instead of ``Docket No. FAA-2023-1889.''
    Although no other part of the preamble or regulatory information 
has been corrected, for clarity, the FAA is publishing the entire 
proposed rule in the Federal Register.
    The comment due date of the NPRM remains November 2, 2023.

Related Service Information Under 1 CFR Part 51

    The FAA reviewed EASA AD 2023-0115, which specifies procedures for 
operators to revise the ALS of the existing approved engine maintenance 
or inspection program, as applicable, to incorporate new or more 
restrictive tasks and limitations and associated thresholds and 
intervals for life-limited parts.
    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.

FAA's Determination

    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 is issuing this NPRM after 
determining that the unsafe condition described previously is likely to 
exist or develop on other products of the same type design.

Proposed AD Requirements in This NPRM

    This proposed AD would require revising the ALS of the operator's 
existing approved engine maintenance or inspection program, as 
applicable, to incorporate new or more restrictive

[[Page 66318]]

tasks and limitations and associated thresholds and intervals for life-
limited parts, which are specified in the MCAI described previously, 
except for any differences identified as exceptions in the regulatory 
text of this proposed AD and as discussed under ``Differences Between 
this Proposed AD and the MCAI.''

Explanation of Required Compliance Information

    In the FAA's ongoing efforts to improve the efficiency of the AD 
process, the FAA developed a process to use some civil aviation 
authority (CAA) ADs as the primary source of information for compliance 
with requirements for corresponding FAA ADs. The FAA has since 
coordinated with other manufacturers and CAAs to use this process. As a 
result, the FAA proposes to incorporate by reference EASA AD 2023-0115 
in the FAA final rule. This proposed AD would, therefore, require 
compliance with EASA AD 2023-0115 in its entirety through that 
incorporation, except for any differences identified as exceptions in 
the regulatory text of this proposed AD. Using common terms that are 
the same as the heading of a particular section in the EASA AD does not 
mean that operators need comply only with that section. For example, 
where the AD requirement refers to ``all required actions within 
compliance times,'' compliance with this AD requirement is not limited 
to the section titled ``Required Action(s) and Compliance Time(s)'' in 
EASA AD 2023-0115. Service information required by the EASA AD for 
compliance will be available at regulations.gov under Docket No. FAA-
2023-1889 after the FAA final rule is published.

Differences Between This Proposed AD and the MCAI

    Where paragraph (3) of EASA AD 2023-0115 specifies revising the 
approved Aircraft Maintenance Programme within 12 months after the 
effective date of EASA AD 2023-0115, this proposed AD would require 
revising the ALS of the existing approved engine maintenance or 
inspection program, as applicable, within 90 days after the effective 
date of this AD.
    This proposed AD would not require compliance with paragraphs (1), 
(2), (4), and (5) of EASA AD 2023-0115.

Costs of Compliance

    The FAA estimates that this AD, if adopted as proposed, would 
affect 2 engines installed on airplanes of U.S. registry.
    The FAA estimates the following costs to comply with this proposed 
AD:

                                                 Estimated Costs
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                                                                                    Cost per       Cost on U.S.
              Action                        Labor Cost            Parts Cost        product         operators
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Revise the ALS....................  1 work-hour x $85 per                  $0              $85             $170
                                     hour = $85.
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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

    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 above, I certify that the 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

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  [Corrected]

0
2. The FAA amends Sec.  39.13 by:
0
a. Removing Airworthiness Directive AD 2021-25-04, Amendment 39-21847 
(86 FR 71129, December 15, 2021); and
0
b. Adding the following new airworthiness directive:

Rolls-Royce Deutschland Ltd & Co KG: Docket No. FAA-2023-1889; 
Project Identifier MCAI-2023-00738-E.

(a) Comments Due Date

    The FAA must receive comments on this airworthiness directive 
(AD) by November 2, 2023.

(b) Affected ADs

    This AD replaces AD 2021-25-04, Amendment 39-21847 (86 FR 71129, 
December 15, 2021).

(c) Applicability

    This AD applies to Rolls-Royce Deutschland Ltd & Co KG 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.

(d) Subject

    Joint Aircraft System Component (JASC) Code 7200, Engine 
(Turbine/Turboprop).

(e) Unsafe Condition

    This AD was prompted by the manufacturer revising the engine 
time limits manual (TLM) life limits of certain critical rotating 
parts and direct accumulation counting data files. The FAA is 
issuing this AD to prevent the failure of critical rotating

[[Page 66319]]

parts. The unsafe condition, if not addressed, could result in 
failure of one or more engines, loss of thrust control, and loss of 
the airplane.

(f) Compliance

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

(g) Required Actions

    Except as specified in paragraph (h) of this AD: Perform all 
required actions within the compliance times specified in, and in 
accordance with, European Union Aviation Safety Agency (EASA) AD 
2023-0115, dated June 7, 2023 (EASA AD 2023-0115).

(h) Exceptions to EASA AD 2023-0115

    (1) Where EASA AD 2023-0115 defines the AMP as the approved 
Aircraft Maintenance Programme containing the tasks on the basis of 
which the scheduled maintenance is conducted to ensure the 
continuing airworthiness of each operated engine, this AD defines 
the AMP as the aircraft maintenance program containing the tasks on 
the basis of which the scheduled maintenance is conducted to ensure 
the continuing airworthiness of each operated airplane.
    (2) Where EASA AD 2023-0115 refers to its effective date, this 
AD requires using the effective date of this AD.
    (3) This AD does not require compliance with paragraphs (1), 
(2), (4), and (5) of EASA AD 2023-0115.
    (4) Where paragraph (3) of EASA AD 2023-0115 specifies revising 
the approved AMP within 12 months after the effective date of EASA 
AD 2023-0115, this AD requires revising the airworthiness 
limitations section of the existing approved engine maintenance or 
inspection program, as applicable, within 90 days after the 
effective date of this AD.
    (5) This AD does not adopt the Remarks paragraph of EASA AD 
2023-0115.

(i) Provisions for Alternative Actions and Intervals

    After performing the actions required by paragraph (g) of this 
AD, no alternative actions and associated thresholds and intervals, 
including life limits, are allowed unless they are approved as 
specified in the provisions of the ``Ref. Publications'' section of 
EASA AD 2023-0115.

(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, 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 (EASA) AD 2023-0115, 
dated June 7, 2023.
    (ii) [Reserved]
    (3) For EASA AD 2023-0115, 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 EASA 
AD on the EASA website at ad.easa.europa.eu.
    (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: www.archives.gov/federal-register/cfr/ibr-locations.html.

    Issued on September 22, 2023.
Victor Wicklund,
Deputy Director, Compliance & Airworthiness Division, Aircraft 
Certification Service.
[FR Doc. 2023-21090 Filed 9-25-23; 4:15 pm]
BILLING CODE 4910-13-P


