[Federal Register Volume 87, Number 105 (Wednesday, June 1, 2022)]
[Proposed Rules]
[Pages 33071-33075]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2022-11354]


=======================================================================
-----------------------------------------------------------------------

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2022-0467; Project Identifier AD-2022-00174-E]
RIN 2120-AA64


Airworthiness Directives; General Electric Company Turbofan 
Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

-----------------------------------------------------------------------

SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD) 
for certain General Electric Company (GE) GEnx-1B and GEnx-2B model 
turbofan engines. This proposed AD was prompted by the detection of 
melt-related freckles in the forgings and billets, which may reduce the 
life of certain compressor discharge pressure (CDP) seals, interstage 
seals, high-pressure turbine (HPT) rotor stage 2 disks, and stages 6-10 
compressor rotor spools. This proposed AD would require revising the 
airworthiness limitations section (ALS) of the applicable GEnx-1B and 
GEnx-2B Engine Manual (EM) and the operator's existing approved 
maintenance program or inspection program, as applicable, to 
incorporate reduced life limits for these parts. The FAA is proposing 
this AD to address the unsafe condition on these products.

DATES: The FAA must receive comments on this proposed AD by July 18, 
2022.

ADDRESSES: You may send comments, using the procedures found in 14 CFR 
11.43 and 11.45, by any of the following methods:
    <bullet> Federal eRulemaking Portal: Go to https://www.regulations.gov. Follow the instructions for submitting comments.
    <bullet> Fax: (202) 493-2251.
    <bullet> 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.
    <bullet> Hand Delivery: Deliver to Mail address above between 9 
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
    For service information identified in this NPRM, contact General 
Electric Company, 1 Neumann Way, Cincinnati, OH 45215; phone: (513) 
552-3272; email: <a href="/cdn-cgi/l/email-protection#5d3c2b343c29343233733b313838292e282d2d322f291d3c38733a38733e3230"><span class="__cf_email__" data-cfemail="29485f40485d404647074f454c4c5d5a5c5959465b5d69484c074e4c074a4644">[email protected]</span></a>; website: https://www.ge.com. 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.

Examining the AD Docket

    You may examine the AD docket at https://www.regulations.gov by 
searching for and locating Docket No. FAA-2022-0467; 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, any comments 
received, and other information. The street address for Docket 
Operations is listed above.

FOR FURTHER INFORMATION CONTACT: Alexei Marqueen, Aviation Safety 
Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; 
phone: (781) 238-7178; email: <a href="/cdn-cgi/l/email-protection#7f3e131a071a16512b51321e0d0e0a1a1a113f191e1e51181009"><span class="__cf_email__" data-cfemail="8ccde0e9f4e9e5a2d8a2c1edfefdf9e9e9e2cceaededa2ebe3fa">[email protected]</span></a>.

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-2022-0467; Project Identifier 
AD-2022-00174-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

[[Page 33072]]

11.35, the FAA will post all comments received, without change, to 
https://www.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 
Alexei Marqueen, Aviation Safety Engineer, ECO Branch, FAA, 1200 
District Avenue, Burlington, MA 01803. 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 was notified by the engine manufacturer of the detection of 
melt-related freckles in the forgings and billets, which may reduce the 
life of certain CDP seals, interstage seals, HPT rotor stage 2 disks, 
and stages 6-10 compressor rotor spools (life-limited parts (LLPs)) on 
GEnx-1B54/P2, GEnx-1B58/P2, GEnx-1B64/P2, GEnx-1B67/P2, GEnx-1B70/P2, 
GEnx-1B70C/P2, GEnx-1B70/72/P2, GEnx-1B70/75/P2, GEnx-1B74/75/P2, GEnx-
1B75/P2, GEnx-1B76/P2, GEnx-1B76A/P2, and GEnx-1B78/P2 (GEnx-1B) and 
GEnx-2B67, GEnx-2B67B, and GEnx-2B67/P (GEnx-2B) model turbofan 
engines. The manufacturer's investigation determined that, as a result 
of such freckles forming in the forgings and billets, certain LLPs may 
have undetected subsurface anomalies that developed during the 
manufacturing process, resulting in reduced material properties and a 
lower fatigue life capability. Reduced material properties may cause 
premature LLP fracture, which could result in uncontained debris 
release. As a result of its investigation, the manufacturer determined 
the need to reduce the life limits of certain LLPs. To reflect these 
reduced life limits, the manufacturer revised the ALS of the affected 
GEnx-1B and GEnx-2B EMs. The FAA is proposing to require operators to 
update the ALS of the applicable GEnx-1B and GEnx-2B EM with the 
reduced life limits for certain LLPs. This condition, if not addressed, 
could result in uncontained debris release, damage to the engine, and 
damage to the airplane.

FAA's Determination

    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.

Related Service Information

    The FAA reviewed GE GEnx-1B Service Bulletin (SB) 72-0484 R00, 
dated August 11, 2021, and GE GEnx-2B SB 72-0423 R00, dated August 11, 
2021. These SBs, differentiated by engine model, provide the reduced 
life limits for certain LLPs.

Proposed AD Requirements in This NPRM

    This proposed AD would require revising the ALS of the applicable 
GEnx-1B and GEnx-2B EM and the operator's existing approved maintenance 
program or inspection program, as applicable, to incorporate reduced 
life limits for certain LLPs.

Differences Between This Proposed AD and the Service Information

    GE GEnx-2B Service Bulletin (SB) 72-0423 R00, dated August 11, 
2021, uses the term ``HPT stage 2 disk'' to describe HPT stage 2 disk 
P/N 2383M86P02, while this proposed AD uses the term ``HPT rotor stage 
2 disk.''

Costs of Compliance

    The FAA estimates that this AD, if adopted as proposed, would 
affect 390 engines installed on airplanes of U.S. registry.
    The FAA estimates the following costs to comply with this proposed 
AD:

                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                                     Cost per      Cost on U.S.
                Action                         Labor cost           Parts cost        product        operators
----------------------------------------------------------------------------------------------------------------
Revise ALS of EM and the operator's     1 work-hour x $85 per                 $0             $85         $33,150
 existing approved maintenance or        hour = $85.
 inspection program.
----------------------------------------------------------------------------------------------------------------

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.

[[Page 33073]]

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:

General Electric Company: Docket No. FAA-2022-0467; Project 
Identifier AD-2022-00174-E.

(a) Comments Due Date

    The FAA must receive comments on this airworthiness directive 
(AD) by July 18, 2022.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to General Electric Company (GE) GEnx-1B54/P2, 
GEnx-1B58/P2, GEnx-1B64/P2, GEnx-1B67/P2, GEnx-1B70/P2, GEnx-1B70C/
P2, GEnx-1B70/72/P2, GEnx-1B70/75/P2, GEnx-1B74/75/P2, GEnx-1B75/P2, 
GEnx-1B76/P2, GEnx-1B76A/P2, GEnx-1B78/P2, GEnx-2B67, GEnx-2B67B, 
and GEnx-2B67/P model turbofan engines.

(d) Subject

    Joint Aircraft System Component (JASC) Code 7230, Turbine Engine 
Compressor Section, and JASC Code 7250, Turbine Section.

(e) Unsafe Condition

    This AD was prompted by the detection of melt-related freckles 
in the forgings and billets, which may reduce the life of certain 
compressor discharge pressure (CDP) seals, interstage seals, high-
pressure turbine (HPT) rotor stage 2 disks, and stages 6-10 
compressor rotor spools. The FAA is issuing this AD to prevent 
failure of the CDP seal, interstage seal, HPT rotor stage 2 disk, 
and stages 6-10 compressor rotor spool. The unsafe condition, if not 
addressed, could result in uncontained debris release, damage to the 
engine, and damage to the airplane.

(f) Compliance

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

(g) Required Actions

    (1) For all affected GEnx-1B model turbofan engines, within 90 
days after the effective date of this AD, revise the airworthiness 
limitations section (ALS) of the existing GEnx-1B Engine Manual (EM) 
and the operator's existing approved maintenance program or 
inspection program, as applicable, by inserting the following 
information into the applicable table for their respective part 
numbers:
    (i) For stages 6-10 compressor rotor spool part number (P/N) 
2628M56G01, insert the information in Table 1 to paragraph (g)(1)(i) 
of this AD.

                                    Table 1 to Paragraph (g)(1)(i)--Stages 6-10 Compressor Rotor Spool P/N 2628M56G01
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                           Life cycles                Life cycles
                                                                            -1B58/P2  -               -1B70/72/P2
              Part name                      Part No.         Life cycles   1B64/P2  -  Life cycles   -1B70/75/P2  Life cycles  Life cycles  Life cycles
                                                                -1B54/P2    1B67/P2  -    -1B70C/P2   -1B74/75/P2    -1B76/P2     -1B76A/P2    -1B78/P2
                                                                             1B70/P2                   -1B75/P2
--------------------------------------------------------------------------------------------------------------------------------------------------------
Spool, Stage 6-10...................  2628M56G01 For part          17,000       17,000       15,000        15,000       14,600       12,200       14,600
                                       serial numbers NOT
                                       listed in GEnx-1B SB
                                       72-0484, latest
                                       revision.
Spool, Stage 6-10...................  2628M56G01 For part          10,300       10,300       10,300        10,300        8,500        8,500        8,500
                                       serial numbers listed
                                       in Table 1 of GEnx-1B
                                       SB 72-0484, latest
                                       revision.
Spool, Stage 6-10...................  2628M56G01 For part           5,700        5,700        5,700         5,700        4,800        4,800        4,800
                                       serial numbers listed
                                       in Table 2 of GEnx-1B
                                       SB 72-0484, latest
                                       revision.
--------------------------------------------------------------------------------------------------------------------------------------------------------

    (ii) For CDP seal P/N 2383M82P03, insert the information in 
Table 2 to paragraph (g)(1)(ii) of this AD.

                                                Table 2 to Paragraph (g)(1)(ii)--CDP Seal P/N 2383M82P03
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                           Life cycles                Life cycles
                                                                            -1B58/P2  -               -1B70/72/P2
              Part name                      Part No.         Life cycles   1B64/P2  -  Life cycles   -1B70/75/P2  Life cycles  Life cycles  Life cycles
                                                                -1B54/P2    1B67/P2  -    -1B70C/P2   -1B74/75/P2    -1B76/P2     -1B76A/P2    -1B78/P2
                                                                             1B70/P2                   -1B75/P2
--------------------------------------------------------------------------------------------------------------------------------------------------------
Seal, CDP...........................  2383M82P03 For part          20,000       20,000       15,000        15,000       15,000       15,000       15,000
                                       serial numbers NOT
                                       listed in GEnx-1B SB
                                       72-0484, latest
                                       revision.
Seal, CDP...........................  2383M82P03 For part           6,100        6,100        6,100         6,100        5,300        5,300        5,300
                                       serial numbers listed
                                       in Table 3 of GEnx-1B
                                       SB 72-0484, latest
                                       revision.
Seal, CDP...........................  2383M82P03 For part          13,400       13,400       13,400        13,400        9,300        9,300        9,300
                                       serial numbers listed
                                       in Table 4 of GEnx-1B
                                       SB 72-0484, latest
                                       revision.
Seal, CDP...........................  2383M82P03 For part           3,600        3,600        3,600         3,600        2,900        2,900        2,900
                                       serial numbers listed
                                       in Table 5 of GEnx-1B
                                       SB 72-0484, latest
                                       revision.
--------------------------------------------------------------------------------------------------------------------------------------------------------

    (iii) For interstage seal P/N 2383M85P04, insert the information 
in Table 3 to paragraph (g)(1)(iii) of this AD.

[[Page 33074]]



                                            Table 3 to Paragraph (g)(1)(iii)--Interstage Seal P/N 2383M85P04
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                           Life cycles                Life cycles
                                                                            -1B58/P2  -               -1B70/72/P2
              Part name                      Part No.         Life cycles   1B64/P2  -  Life cycles   -1B70/75/P2  Life cycles  Life cycles  Life cycles
                                                                -1B54/P2    1B67/P2  -    -1B70C/P2   -1B74/75/P2    -1B76/P2     -1B76A/P2    -1B78/P2
                                                                             1B70/P2                   -1B75/P2
--------------------------------------------------------------------------------------------------------------------------------------------------------
Seal, Interstage....................  2383M85P04 For part          17,000       15,000       15,000        15,000       14,200       14,800       14,200
                                       serial numbers NOT
                                       listed in GEnx-1B SB
                                       72-0484, latest
                                       revision.
Seal, Interstage....................  2383M85P04 For part          10,500       10,500       10,500        10,500        6,400        6,400        6,400
                                       serial numbers listed
                                       in Table 6 of GEnx-1B
                                       SB 72-0484, latest
                                       revision.
Seal, Interstage....................  2383M85P04 For part          15,000       15,000       15,000        15,000       10,500       10,500       10,500
                                       serial numbers listed
                                       in Table 7 of GEnx-1B
                                       SB 72-0484, latest
                                       revision.
Seal, Interstage....................  2383M85P04 For part           5,500        5,500        5,500         5,500        2,800        2,800        2,800
                                       serial numbers listed
                                       in Table 8 of GEnx-1B
                                       SB 72-0484, latest
                                       revision.
--------------------------------------------------------------------------------------------------------------------------------------------------------

    (iv) For HPT rotor stage 2 disk P/N 2383M86P02, insert the 
information in Table 4 to paragraph (g)(1)(iv) of this AD.

                                         Table 4 to Paragraph (g)(1)(iv)--HPT Rotor Stage 2 Disk P/N 2383M86P02
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                           Life cycles                Life cycles
                                                                            -1B58/P2  -               -1B70/72/P2
              Part name                      Part No.         Life cycles   1B64/P2  -  Life cycles   -1B70/75/P2  Life cycles  Life cycles  Life cycles
                                                                -1B54/P2    1B67/P2  -    -1B70C/P2   -1B74/75/P2    -1B76/P2     -1B76A/P2    -1B78/P2
                                                                             1B70/P2                   -1B75/P2
--------------------------------------------------------------------------------------------------------------------------------------------------------
Disk, Stage 2.......................  2383M86P02 For part          12,100       12,100       10,400        10,400        9,500        6,800        9,500
                                       serial numbers NOT
                                       listed in GEnx-1B SB
                                       72-0484, latest
                                       revision.
Disk, Stage 2.......................  2383M86P02 For part           6,900        6,900        6,900         6,900        5,100        5,100        5,100
                                       serial numbers listed
                                       in Table 9 of GEnx-1B
                                       SB 72-0484, latest
                                       revision.
Disk, Stage 2.......................  2383M86P02 For part          10,400       10,400       10,400        10,400        7,500        6,800        7,500
                                       serial numbers listed
                                       in Table 10 of GEnx-
                                       1B SB 72-0484, latest
                                       revision.
Disk, Stage 2.......................  2383M86P02 For part           3,800        3,800        3,800         3,800        3,000        3,000        3,000
                                       serial numbers listed
                                       in Table 11 of GEnx-
                                       1B SB 72-0484, latest
                                       revision.
--------------------------------------------------------------------------------------------------------------------------------------------------------

    (2) For all affected GEnx-2B model turbofan engines, within 90 
days after the effective date of this AD, revise the ALS of the 
existing GEnx-2B EM and the operator's existing approved maintenance 
program or inspection program, as applicable, by inserting the 
following information into the applicable table for their respective 
part numbers:
    (i) For stages 6-10 compressor rotor spool P/N 2628M56G01, 
insert the information in Table 5 to paragraph (g)(2)(i) of this AD.

                Table 5 to Paragraph (g)(2)(i)--Stages 6-10 Compressor Rotor Spool P/N 2628M56G01
----------------------------------------------------------------------------------------------------------------
                                                                  Life cycles  -  Life cycles  -  Life cycles  -
              Part name                         Part No.               2B67            2B67B          2B67/P
----------------------------------------------------------------------------------------------------------------
Spool, Stage 6-10....................  2628M56G01 For part        ..............  ..............          11,100
                                        serial numbers NOT
                                        listed in GEnx-2B SB 72-
                                        0423, latest revision.
Spool, Stage 6-10....................  2628M56G01 For part        ..............  ..............          10,300
                                        serial numbers listed in
                                        Table 1 of GEnx-2B SB 72-
                                        0423, latest revision.
Spool, Stage 6-10....................  2628M56G01 For part        ..............  ..............           5,700
                                        serial numbers listed in
                                        Table 2 of GEnx-2B SB 72-
                                        0423, latest revision.
----------------------------------------------------------------------------------------------------------------

    (ii) For CDP seal P/N 2383M82P03, insert the information in 
Table 6 to paragraph (g)(2)(ii) of this AD.

                            Table 6 to Paragraph (g)(2)(ii)--CDP Seal P/N 2383M82P03
----------------------------------------------------------------------------------------------------------------
                                                                  Life cycles  -  Life cycles  -  Life cycles  -
              Part name                         Part No.               2B67            2B67B          2B67/P
----------------------------------------------------------------------------------------------------------------
Seal, CDP............................  2383M82P03 For part        ..............  ..............          15,000
                                        serial numbers NOT
                                        listed in GEnx-2B SB 72-
                                        0423, latest revision.

[[Page 33075]]

 
Seal, CDP............................  2383M82P03 For part        ..............  ..............           6,100
                                        serial numbers listed in
                                        Table 3 of GEnx-2B SB 72-
                                        0423, latest revision.
Seal, CDP............................  2383M82P03 For part        ..............  ..............          13,400
                                        serial numbers listed in
                                        Table 4 of GEnx-2B SB 72-
                                        0423, latest revision.
Seal, CDP............................  2383M82P03 For part        ..............  ..............           3,600
                                        serial numbers listed in
                                        Table 5 of GEnx-2B SB 72-
                                        0423, latest revision.
----------------------------------------------------------------------------------------------------------------

    (iii) For interstage seal P/N 2383M85P04, insert the information 
in Table 7 to paragraph (g)(2)(iii) of this AD.

                        Table 7 to Paragraph (g)(2)(iii)--Interstage Seal P/N 2383M85P04
----------------------------------------------------------------------------------------------------------------
                                                                  Life cycles  -  Life cycles  -  Life cycles  -
              Part name                         Part No.               2B67            2B67B          2B67/P
----------------------------------------------------------------------------------------------------------------
Seal, Interstage.....................  2383M85P04 For part        ..............  ..............          15,000
                                        serial numbers NOT
                                        listed in GEnx-2B SB 72-
                                        0423, latest revision.
Seal, Interstage.....................  2383M85P04 For part        ..............  ..............          10,500
                                        serial numbers listed in
                                        Table 6 of GEnx-2B SB 72-
                                        0423, latest revision.
Seal, Interstage.....................  2383M85P04 For part        ..............  ..............          15,000
                                        serial numbers listed in
                                        Table 7 of GEnx-2B SB 72-
                                        0423, latest revision.
Seal, Interstage.....................  2383M85P04 For part        ..............  ..............           5,500
                                        serial numbers listed in
                                        Table 8 of GEnx-2B SB 72-
                                        0423, latest revision.
----------------------------------------------------------------------------------------------------------------

    (iv) For HPT rotor stage 2 disk P/N 2383M86P02, insert the 
information in Table 8 to paragraph (g)(2)(iv) of this AD.

                     Table 8 to Paragraph (g)(2)(iv)--HPT Rotor Stage 2 Disk P/N 2383M86P02
----------------------------------------------------------------------------------------------------------------
                                                                  Life cycles  -  Life cycles  -  Life cycles  -
              Part name                         Part No.               2B67            2B67B          2B67/P
----------------------------------------------------------------------------------------------------------------
Disk, Stage 2........................  2383M86P02 For part        ..............  ..............          13,300
                                        serial numbers NOT
                                        listed in GEnx-2B SB 72-
                                        0423, latest revision.
Disk, Stage 2........................  2383M86P02 For part        ..............  ..............           6,900
                                        serial numbers listed in
                                        Table 9 of GEnx-2B SB 72-
                                        0423, latest revision.
Disk, Stage 2........................  2383M86P02 For part        ..............  ..............          10,400
                                        serial numbers listed in
                                        Table 10 of GEnx-2B SB
                                        72-0423, latest revision.
Disk, Stage 2........................  2383M86P02 For part        ..............  ..............           3,800
                                        serial numbers listed in
                                        Table 11 of GEnx-2B SB
                                        72-0423, latest revision.
----------------------------------------------------------------------------------------------------------------

    (3) After performing the actions required by paragraphs (g)(1) 
and (2) of this AD, except as provided in paragraph (h) of this AD, 
no alternative life limits may be approved for the affected parts.

(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 paragraph (i)(1) of this AD and email to: <a href="/cdn-cgi/l/email-protection#14555a513955503955595b57547275753a737b62"><span class="__cf_email__" data-cfemail="93d2ddd6bed2d7bed2dedcd0d3f5f2f2bdf4fce5">[email protected]</span></a>.
    (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 Alexei Marqueen, 
Aviation Safety Engineer, ECO Branch, FAA, 1200 District Avenue, 
Burlington, MA 01803; phone: (781) 238-7178; email: 
<a href="/cdn-cgi/l/email-protection#edac8188958884c3b9c3a08c9f9c98888883ad8b8c8cc38a829b"><span class="__cf_email__" data-cfemail="5e1f323b263b37700a70133f2c2f2b3b3b301e383f3f70393128">[email protected]</span></a>.
    (2) For service information identified in this AD, contact 
General Electric Company, 1 Neumann Way, Cincinnati, OH 45215; 
phone: (513) 552-3272; email: <a href="/cdn-cgi/l/email-protection#9afbecf3fbeef3f5f4b4fcf6ffffeee9efeaeaf5e8eedafbffb4fdffb4f9f5f7"><span class="__cf_email__" data-cfemail="bfdec9d6decbd6d0d191d9d3dadacbcccacfcfd0cdcbffdeda91d8da91dcd0d2">[email protected]</span></a>; 
website: https://www.ge.com. 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 
(817) 222-5110.

    Issued on May 12, 2022.
Gaetano A. Sciortino,
Deputy Director for Strategic Initiatives, Compliance & Airworthiness 
Division, Aircraft Certification Service.
[FR Doc. 2022-11354 Filed 5-31-22; 8:45 am]
BILLING CODE 4910-13-P


</pre><script data-cfasync="false" src="/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js"></script></body>
</html>