[Federal Register Volume 88, Number 114 (Wednesday, June 14, 2023)]
[Proposed Rules]
[Pages 38759-38762]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2023-12698]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2023-1212; Project Identifier MCAI-2022-00423-E]
RIN 2120-AA64


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

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD) 
for all Rolls-Royce Deutschland Ltd. & Co. KG (RRD) Model RB211 Trent 
768-60, 772-60, and 772B-60 engines. This proposed AD was prompted by 
reports of cracks on affected intermediate-pressure compressor (IPC) 
rotor shaft balance lands. This proposed AD would require repetitive 
on-wing or in-shop borescope inspections (BSIs) of the affected IPC 
rotor shaft balance land for cracks, replacement of any IPC rotor shaft 
if necessary, and would prohibit the installation of an affected IPC 
rotor shaft on any engine, as specified in a 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.

DATES: The FAA must receive comments on this NPRM by July 31, 2023.

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 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-2023-1212; 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 EASA service information that is proposed for IBR in 
this NPRM, 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. It is also available at regulations.gov under Docket 
No. FAA-2023-1212.
     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, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; 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-2023-1212; Project Identifier 
MCAI-2022-00423-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

[[Page 38760]]

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, 1600 Stewart Avenue, Suite 
410, Westbury, NY 11590. Any commentary that the FAA receives which is 
not specifically designated as CBI will be placed in the public docket 
for this rulemaking.

Background

    EASA, which is the Technical Agent for the Member States of the 
European Union, has issued EASA AD 2022-0055, dated March 23, 2022 
(EASA AD 2022-0055) (also referred to as the MCAI), to correct an 
unsafe condition for all RRD Model RB211 Trent 768-60, 772-60, 772B-60, 
and 772C-60 engines. The MCAI states that cracking on the IPC rotor 
shaft balance land has been historically observed on RRD Model Trent 
700 engines. To address this unsafe condition, Roll-Royce (RR) 
originally developed Modification 72-AG402, which introduced a revised 
balancing method that removed the original balancing weights from the 
IPC rotor shaft balance land and published RR Service Bulletin (SB) 
RB.211-72-AG402 to provide instructions for an in-service modification. 
In addition, RR published Non-Modification Service Bulletin (NMSB) 
RB.211-72-AG085, Revision 3, dated August 27, 2021, to provide 
instructions for an in-shop eddy current inspection (ECI) of the IPC 
rotor shaft balance land. Consequently, EASA issued EASA AD 2018-
0049R2, dated September 13, 2021 (EASA AD 2018-0049R2).
    Since EASA issued EASA AD 2018-0049R2, RR determined that some RRD 
Model Trent 700 engines (post-RR SB RB.211-72-AG402) were not inspected 
in accordance with RR NMSB RB.211-72-AG085 during engine refurbishment 
due to the policy applied previously from RR NMSB RB.211-72-AG085, 
Revision 2. RR identified the affected batch of IPC rotor shaft balance 
lands and published RR NMSB RB.211-72-AK706, Initial Issue, dated 
November 24, 2021, which describes procedures to perform a BSI of the 
IPC rotor shaft balance land until the in-shop ECI is accomplished in 
accordance with RR NMSB RB.211-72-AG085. To address this, EASA issued 
the MCAI. This condition, if not addressed, could lead to IPC rotor 
shaft failure and consequent uncontained high-energy debris, possibly 
resulting in damage to the airplane.
    You may examine the MCAI in the AD docket at regulations.gov under 
Docket No. FAA-2023-1212.

Related Service Information Under 1 CFR Part 51

    The FAA reviewed EASA AD 2022-0055, which specifies procedures for 
performing repetitive on-wing or in-shop BSIs of the IPC rotor shaft 
balance land and, if any discrepancies are detected, accomplishing the 
applicable corrective actions or replacing the IPC rotor shaft. The 
MCAI also specifies prohibiting the installation of an affected IPC 
rotor shaft on any engine and that accomplishing an in-shop ECI of the 
IPC rotor shaft balance land or replacing the IPC rotor shaft 
constitutes as terminating action for the repetitive BSIs.
    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 described 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 accomplishing the actions specified 
in the MCAI described previously, except for any differences identified 
as exceptions in the regulatory text of this proposed AD and except 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 2022-0055 
in the FAA final rule. This proposed AD would, therefore, require 
compliance with EASA AD 2022-0055 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 the 
compliance times,'' compliance with this AD requirement is not limited 
to the section titled ``Required Action(s) and Compliance Time(s)'' in 
EASA AD 2022-0055. Service information required by the EASA AD for 
compliance will be available at regulations.gov by searching for and 
locating Docket No. FAA-2023-1212 after the FAA final rule is 
published.

Differences Between This Proposed AD and the MCAI

    EASA AD 2022-0055 applies to RRD Model RB211 Trent 768-60, 772-60, 
772B-60, and 772C-60 engines. This proposed AD would not apply to RRD 
Model RB211 Trent 772C-60 engines, as this model engine does not have 
an FAA type certificate.

Costs of Compliance

    The FAA estimates that this AD, if adopted as proposed, would 
affect 62 engines installed on airplanes of U.S. registry.
    The FAA estimates the following costs to comply with this proposed 
AD:

[[Page 38761]]



                                                 Estimated Costs
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                                                                                    Cost per       Cost on U.S.
               Action                        Labor cost           Parts cost        product         operators
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BSI of IPC rotor shaft balance land.  4.5 work-hours x $85                 $0          $382.50          $23,715
                                       per hour = $382.50.
----------------------------------------------------------------------------------------------------------------

    The FAA estimates the following costs to do any necessary 
replacements that would be required based on the results of the 
proposed inspection. The agency has no way of determining the number of 
aircraft that might need these replacements:

                                               On-Condition Costs
----------------------------------------------------------------------------------------------------------------
                                                                                                     Cost per
                    Action                                Labor cost               Parts cost        product
----------------------------------------------------------------------------------------------------------------
Replace IPC rotor shaft......................  50 work-hours x $85 per hour =       $2,120,000       $2,124,250
                                                $4,250.
----------------------------------------------------------------------------------------------------------------

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 this 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  [Amended]

0
2. The FAA amends Sec.  39.13 by adding the following new airworthiness 
directive:

Rolls-Royce Deutschland Ltd. & Co. KG: Docket No. FAA-2023-1212; 
Project Identifier MCAI-2022-00423-E.

(a) Comments Due Date

    The FAA must receive comments on this airworthiness directive 
(AD) by July 31, 2023.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to Rolls-Royce Deutschland Ltd. & Co. KG Model 
RB211 Trent 768-60, 772-60, and 772B-60 engines.

(d) Subject

    Joint Aircraft System Component (JASC) Code 7230, Turbine Engine 
Compressor Section.

(e) Unsafe Condition

    This AD was prompted by reports of cracks on the intermediate-
pressure compressor (IPC) rotor shaft balance land. The FAA is 
issuing this AD to detect cracks on the IPC rotor shaft balance 
land. The unsafe condition, if not addressed, could lead to IPC 
rotor shaft failure and consequent uncontained high-energy debris, 
possibly resulting in damage to 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, European Union Aviation Safety Agency 
(EASA) AD 2022-0055, dated March 23, 2022 (EASA AD 2022-0055).

(h) Exceptions to EASA AD 2022-0055

    (1) Where EASA AD 2022-0055 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 
2022-0055.
    (3) Where the service information referenced in EASA AD 2022-
0055 specifies to use certain tooling, equivalent tooling may be 
used.

(i) No Reporting Requirement

    Although the service information referenced in EASA AD 2022-0055 
specifies to notify the manufacturer or supply pictures to the 
manufacturer of any cracks, dents, or nicks, this AD does not 
include that requirement.

(j) Alternative Methods of Compliance (AMOCs)

    (1) The Manager, International Validation 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 International Validation 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.

[[Page 38762]]

(k) Additional Information

    For more information about this AD, contact Sungmo Cho, Aviation 
Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 
11590; 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 2022-0055, dated 
March 23, 2022.
    (ii) [Reserved]
    (3) For EASA AD 2022-0055, 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 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.
    (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 8, 2023.
Michael Linegang,
Acting Director, Compliance & Airworthiness Division, Aircraft 
Certification Service.
[FR Doc. 2023-12698 Filed 6-13-23; 8:45 am]
BILLING CODE 4910-13-P