Document ID: FAA-2022-0467-0010
Agency: faa
Document Type: Rule
Title: Airworthiness Directives: General Electric Company Turbofan Engines
Posted Date: 2022-10-12T04:00Z

[Federal Register Volume 87, Number 196 (Wednesday, October 12, 2022)]
[Rules and Regulations]
[Pages 61445-61450]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2022-22061]

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 Rules and Regulations
                                                 Federal Register
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  Federal Register / Vol. 87, No. 196 / Wednesday, October 12, 2022 / 
Rules and Regulations  

[[Page 61445]]

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2022-0467; Project Identifier AD-2022-00174-E; 
Amendment 39-22196; AD 2022-20-12]
RIN 2120-AA64

Airworthiness Directives; General Electric Company Turbofan 
Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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

SUMMARY: The FAA is adopting a new airworthiness directive (AD) for 
certain General Electric Company (GE) GEnx-1B and GEnx-2B model 
turbofan engines. 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. This AD requires 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 issuing this AD to address the unsafe 
condition on these products.

DATES: This AD is effective November 16, 2022.

ADDRESSES: 
    AD Docket: You may examine the AD docket at 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 final rule, 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: Alexei Marqueen, Aviation Safety 
Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; 
phone: (781) 238-7178; 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 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, and GEnx-1B78/P2 (GEnx-1B) and GEnx-2B67, 
GEnx-2B67B, and GEnx-2B67/P (GEnx-2B) model turbofan engines. The NPRM 
published in the Federal Register on June 1, 2022 (87 FR 33071). The 
NPRM was prompted by the engine manufacturer notifying the FAA 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)). 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. In the NPRM, the FAA proposed to require 
operators to update 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. The FAA is issuing this AD to address the unsafe condition on 
these products.

Discussion of Final Airworthiness Directive

Comments

    The FAA received comments from seven commenters. The commenters 
were Air China, Air Line Pilots Association, International (ALPA), 
American Airlines (AAL), GE, The Boeing Company (Boeing), TUI Airways, 
and United Airlines Powerplant Engineering (United Airlines). ALPA, 
Boeing, and United Airlines supported the proposed AD without change. 
AAL supported the proposed AD, with one comment relating to the service 
information. Three commenters, Air China, GE, and TUI Airways, 
requested changes to the proposed AD. The following presents the 
comments received on the NPRM and the FAA's response to each comment.

Request To Update Service Information

    AAL and GE noted that the preamble of the NPRM refers to service 
information that has been superseded. GE published GE GEnx-1B Service 
Bulletin (SB) 72-0484 R01, dated March 17, 2022 (GE GEnx-1B SB 72-0484 
R01), and GE GEnx-2B SB 72-0423 R01, dated March 17, 2022 (GE GEnx-2B 
SB 72-0423 R01). The revisions contain corrections to serial number 
errors published in the original service information. GE requested that 
the FAA update the service information to reflect the current revisions 
to avoid confusion among the operators.
    The FAA agrees and updated the Related Service Information 
paragraph in the preamble of this final rule to reference GE GEnx-1B SB 
72-0484 R01 and GE GEnx-2B SB 72-0423 R01. This change places no 
additional burden on operators who are required to comply with this AD.

Requests To Modify the Tables to Paragraph (g)

    Air China noted that there is a revision to the service information 
in tables 5 through 8 to paragraph (g)(2) of the proposed AD. The 
commenter requested that the FAA modify the service information in the 
tables from ``GEnx-2B SB 72-0423, latest revision'' to ``GEnx-2B SB 72-
0423 R01 revision.''
    The FAA disagrees. Paragraph (g)(2) of this AD requires the 
operator to revise the ALS of the applicable GEnx-2B EM and the 
operator's existing approved maintenance program or inspection

[[Page 61446]]

program, as applicable, by inserting the information in the tables to 
paragraph (g)(2) into the applicable table for their respective part 
numbers. The description of the service information in the tables to 
paragraph (g) of this AD is consistent with the description of the 
service information in the applicable tables in the ALS. The FAA did 
not change this AD as a result of this comment.
    GE requested that the FAA clarify the wording in the proposed AD 
regarding parts not affected or listed in GE GEnx-1B SB 72-0484 R01 and 
GE GEnx-2B SB 72-0423 R01. The commenter noted that the proposed AD 
includes updating the ALS language for parts not affected by the 
population listed in GE GEnx-1B SB 72-0484 and GE GEnx-2B SB 72-0423. 
GE requested that the FAA modify the tables to paragraph (g) of this AD 
to remove the life cycles for part serial numbers not listed in GE 
GEnx-1B SB 72-0484 and GE GEnx-2B SB 72-0423. If such modifications 
cannot be done, GE requested that the FAA add language to clarify that 
future LLP life extensions on part serial numbers not listed in the SB 
populations would not require an alternative method of compliance 
(AMOC).
    The FAA agrees with the modification. The FAA revised the tables to 
paragraph (g) of this AD to remove the entries for life cycles for part 
serial numbers not listed in the service information. This change 
places no additional burden on operators who are required to comply 
with this AD.

Responsibility for Revising the EM

    Air China commented that paragraph (g)(2) of the proposed AD states 
to ``revise the ALS of the existing GEnx-2B EM.'' The commenter stated 
that the responsibility for revising the EM belongs to the 
manufacturer, not the operator.
    The FAA disagrees. While the manufacturer does revise the engine 
manuals, this AD requires the operator to revise the ALS of the 
existing GEnx-2B EM and the operator's existing approved maintenance 
program or inspection program, as applicable. This includes revising 
the operator's copies of the EM to incorporate the reduced life limits 
for certain LLPs. The FAA did not change this AD as a result of this 
comment.

Request To Confirm Compliance With Previous Actions

    Air China stated that it performed certain required actions 
proposed in paragraph (g)(2) of the NPRM using GE GEnx-2B SB 72-0423 
before the NPRM was issued:
    1. For the affected LLPs that had already been installed on GEnx-
2B67/P engines of Air China, Air China listed the LLPs' time limits in 
the continuous airworthiness maintenance program.
    2. For the affected LLPs that were not installed on GEnx-2B67/P 
engines of Air China, Air China issued engineering order documents that 
prohibit the installation of affected LLPs on the Air China GEnx-2B67/P 
fleet.
    Air China asked if the FAA would consider these actions as being in 
compliance with the proposed requirements in paragraph (g)(2) of the 
proposed AD.
    In response to this comment, the FAA notes that paragraph (g)(2) of 
this AD requires the operator to revise the ALS of the existing GEnx-1B 
EM and the operator's existing approved maintenance program or 
inspection program, as applicable, by inserting the information in the 
tables to paragraph (g)(2) into the applicable table for their 
respective part numbers. This AD requires revising the life limits with 
the entirety of the information provided in the tables to paragraph 
(g)(2) of this AD, regardless of the installation of affected parts. 
Additionally, this AD does not contain an installation prohibition.

Request To Allow for Pro-Rated Life Calculations

    TUI Airways requested that the FAA add an allowance for pro-rated 
life calculations to this AD. TUI Airways noted that paragraph (g)(3) 
of the proposed AD states, ``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.'' TUI Airways suggested that this statement does not 
consider parts that have or could operate at different engine ratings 
or are common to two or more engine models. The commenter reasoned that 
a part common to multiple engine ratings or models could have different 
life cycle limits depending on the engine application, and therefore, a 
pro-rated calculation (per GE EM 05-11-00) could be made to determine 
the remaining cycles of the given part.
    The FAA does not agree. The intent of this AD is to revise the ALS 
of the existing GEnx-1B and GEnx-2B EMs and the operator's existing 
approved maintenance or inspection program with the updated life limits 
provided in paragraph (g) of this AD. This AD does not prohibit pro-
rated life limit calculations, but the FAA cautions that such 
calculations performed prior to the effective date of this AD may need 
to be re-evaluated using the new life limits provided in paragraph (g) 
of this AD. The FAA did not change this AD as a result of this comment.

Conclusion

    The FAA reviewed the relevant data, considered any comments 
received, and determined that air safety requires adopting this AD as 
proposed. Accordingly, the FAA is issuing this AD to address the unsafe 
condition on these products. Except for minor editorial changes, and 
any other changes described previously, this AD is adopted as proposed 
in the NPRM. None of the changes will increase the economic burden on 
any operator.

Related Service Information

    The FAA reviewed GE GEnx-1B SB 72-0484 R01, dated March 17, 2022, 
and GE GEnx-2B SB 72-0423 R01, dated March 17, 2022. These SBs, 
differentiated by engine model, provide the reduced life limits for 
certain LLPs.

Costs of Compliance

    The FAA estimates that this AD affects 390 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
----------------------------------------------------------------------------------------------------------------
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.
----------------------------------------------------------------------------------------------------------------

[[Page 61447]]

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:

2022-20-12 General Electric Company: Amendment 39-22196; Docket No. 
FAA-2022-0467; Project Identifier AD-2022-00174-E.

(a) Effective Date

    This airworthiness directive (AD) is effective November 16, 
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 Code 7230, Turbine Engine 
Compressor Section; 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 -                   1B70/72/P2 -
                 Part name                                 Part No.                Life cycles -  1B58/P2 -1B64/   Life cycles -   1B70/75/P2 -    Life cycles -   Life cycles -   Life cycles -
                                                                                      1B54/P2      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 serial numbers           10,300          10,300          10,300          10,300           8,500           8,500           8,500
                                              listed in Table 1 of GEnx-1B SB 72-
                                              0484, latest revision.
Spool, Stage 6-10..........................  2628M56G01 For part serial numbers            5,700           5,700           5,700           5,700           4,800           4,800           4,800
                                              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.

[[Page 61448]]

                                                                    Table 2 to Paragraph (g)(1)(ii)--CDP Seal, P/N 2383M82P03
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                                                                   Life cycles -
                                                                                                   Life cycles -                   1B70/72/P2 -
                 Part name                                 Part No.                Life cycles -  1B58/P2 -1B64/   Life cycles -   1B70/75/P2 -    Life cycles -   Life cycles -   Life cycles -
                                                                                      1B54/P2      P2 -1B67/P2 -     1B70C/P2      1B74/75/P2 -       1B76/P2        1B76A/P2         1B78/P2
                                                                                                      1B70/P2                         1B75/P2
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Seal, CDP..................................  2383M82P03 For part serial numbers            6,100           6,100           6,100           6,100           5,300           5,300           5,300
                                              listed in Table 3 of GEnx-1B SB 72-
                                              0484, latest revision.
Seal, CDP..................................  2383M82P03 For part serial numbers           13,400          13,400          13,400          13,400           9,300           9,300           9,300
                                              listed in Table 4 of GEnx-1B SB 72-
                                              0484, latest revision.
Seal, CDP..................................  2383M82P03 For part serial numbers            3,600           3,600           3,600           3,600           2,900           2,900           2,900
                                              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.

                                                                Table 3 to Paragraph (g)(1)(iii)--Interstage Seal, P/N 2383M85P04
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                                                                   Life cycles -
                                                                                                   Life cycles -                   1B70/72/P2 -
                 Part name                                 Part No.                Life cycles -  1B58/P2 -1B64/   Life cycles -   1B70/75/P2 -    Life cycles -   Life cycles -   Life cycles -
                                                                                      1B54/P2      P2 -1B67/P2 -     1B70C/P2      1B74/75/P2 -       1B76/P2        1B76A/P2         1B78/P2
                                                                                                      1B70/P2                         1B75/P2
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Seal, Interstage...........................  2383M85P04 For part serial numbers           10,500          10,500          10,500          10,500           6,400           6,400           6,400
                                              listed in Table 6 of GEnx-1B SB 72-
                                              0484, latest revision.
Seal, Interstage...........................  2383M85P04 For part serial numbers           15,000          15,000          15,000          15,000          10,500          10,500          10,500
                                              listed in Table 7 of GEnx-1B SB 72-
                                              0484, latest revision.
Seal, Interstage...........................  2383M85P04 For part serial numbers            5,500           5,500           5,500           5,500           2,800           2,800           2,800
                                              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 -                   1B70/72/P2 -
                 Part name                                 Part No.                Life cycles -  1B58/P2 -1B64/   Life cycles -   1B70/75/P2 -    Life cycles -   Life cycles -   Life cycles -
                                                                                      1B54/P2      P2 -1B67/P2 -     1B70C/P2      1B74/75/P2 -       1B76/P2        1B76A/P2         1B78/P2
                                                                                                      1B70/P2                         1B75/P2
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Disk, Stage 2..............................  2383M86P02 For part serial numbers            6,900           6,900           6,900           6,900           5,100           5,100           5,100
                                              listed in Table 9 of GEnx-1B SB 72-
                                              0484, latest revision.
Disk, Stage 2..............................  2383M86P02 For part serial numbers           10,400          10,400          10,400          10,400           7,500           6,800           7,500
                                              listed in Table 10 of GEnx-1B SB
                                              72-0484, latest revision.
Disk, Stage 2..............................  2383M86P02 For part serial numbers            3,800           3,800           3,800           3,800           3,000           3,000           3,000
                                              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.

[[Page 61449]]

               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 serial   ..............  ..............          10,300
                                      numbers listed in Table 1
                                      of GEnx-2B SB 72-0423,
                                      latest revision.
Spool, Stage 6-10..................  2628M56G01 For part serial   ..............  ..............           5,700
                                      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 serial   ..............  ..............           6,100
                                      numbers listed in Table 3
                                      of GEnx-2B SB 72-0423,
                                      latest revision.
Seal, CDP..........................  2383M82P03 For part serial   ..............  ..............          13,400
                                      numbers listed in Table 4
                                      of GEnx-2B SB 72-0423,
                                      latest revision.
Seal, CDP..........................  2383M82P03 For part serial   ..............  ..............           3,600
                                      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 serial   ..............  ..............          10,500
                                      numbers listed in Table 6
                                      of GEnx-2B SB 72-0423,
                                      latest revision.
Seal, Interstage...................  2383M85P04 For part serial   ..............  ..............          15,000
                                      numbers listed in Table 7
                                      of GEnx-2B SB 72-0423,
                                      latest revision.
Seal, Interstage...................  2383M85P04 For part serial   ..............  ..............           5,500
                                      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 serial   ..............  ..............           6,900
                                      numbers listed in Table 9
                                      of GEnx-2B SB 72-0423,
                                      latest revision.
Disk, Stage 2......................  2383M86P02 For part serial   ..............  ..............          10,400
                                      numbers listed in Table 10
                                      of GEnx-2B SB 72-0423,
                                      latest revision.
Disk, Stage 2......................  2383M86P02 For part serial   ..............  ..............           3,800
                                      numbers listed in Table 11
                                      of GEnx-2B SB 72-0423,
                                      latest revision.
----------------------------------------------------------------------------------------------------------------

(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) 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

    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: 
[email protected].

(j) Material Incorporated by Reference

    None.

[[Page 61450]]

    Issued on September 19, 2022.
Christina Underwood,
Acting Director, Compliance & Airworthiness Division, Aircraft 
Certification Service.
[FR Doc. 2022-22061 Filed 10-11-22; 8:45 am]
BILLING CODE 4910-13-P