Rule2021-25491
Airworthiness Directives; General Electric Company Turbofan Engines
Primary source
Metadata and text below are from the Federal Register, a public-domain U.S. government work. Always verify the official published version before relying on it for any legal matter.
Published
November 23, 2021
Effective
December 28, 2021
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA is adopting a new airworthiness directive (AD) for all General Electric Company (GE) GEnx-1B64, GEnx-1B64/P1, GEnx-1B64/P2, GEnx-1B67, GEnx-1B67/P1, GEnx-1B67/P2, GEnx-1B70, GEnx-1B70/75/P1, GEnx-1B70/75/P2, GEnx-1B70/P1, GEnx-1B70/P2, GEnx-1B70C/P1, GEnx-1B70C/ P2, GEnx-1B74/75/P1, GEnx-1B74/75/P2, GEnx-1B76/P2, GEnx-1B76A/P2, GEnx-2B67, GEnx-2B67/P, and GEnx-2B67B model turbofan engines. This AD was prompted by an in-service occurrence of loss of engine thrust control resulting in uncommanded high thrust. This AD requires revising the operator's existing FAA-approved minimum equipment list (MEL) by incorporating into the MEL the dispatch restrictions listed in this AD. This AD also requires initial and repetitive replacement of the electronic engine control (EEC) MN4 microprocessor. The FAA is issuing this AD to address the unsafe condition on these products.
Full Text
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<title>Federal Register, Volume 86 Issue 223 (Tuesday, November 23, 2021)</title>
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[Federal Register Volume 86, Number 223 (Tuesday, November 23, 2021)]
[Rules and Regulations]
[Pages 66447-66453]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2021-25491]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2021-0273; Project Identifier AD-2021-00050-E;
Amendment 39-21765; AD 2021-21-05]
RIN 2120-AA64
Airworthiness Directives; General Electric Company Turbofan
Engines
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule.
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SUMMARY: The FAA is adopting a new airworthiness directive (AD) for all
General Electric Company (GE) GEnx-1B64, GEnx-1B64/P1, GEnx-1B64/P2,
GEnx-1B67, GEnx-1B67/P1, GEnx-1B67/P2, GEnx-1B70, GEnx-1B70/75/P1,
GEnx-1B70/75/P2, GEnx-1B70/P1, GEnx-1B70/P2, GEnx-1B70C/P1, GEnx-1B70C/
P2, GEnx-1B74/75/P1, GEnx-1B74/75/P2, GEnx-1B76/P2, GEnx-1B76A/P2,
GEnx-2B67, GEnx-2B67/P, and GEnx-2B67B model turbofan engines. This AD
was prompted by an in-service occurrence of loss of engine thrust
control resulting in uncommanded high thrust. This AD requires revising
the operator's existing FAA-approved minimum equipment list (MEL) by
incorporating into the MEL the dispatch restrictions listed in this AD.
This AD also requires initial and repetitive replacement of the
electronic engine control (EEC) MN4 microprocessor. The FAA is issuing
this AD to address the unsafe condition on these products.
DATES: This AD is effective December 28, 2021.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in this AD as of December 28,
2021.
ADDRESSES: For service information identified in this final rule,
contact General Electric Company, 1 Neumann Way, Cincinnati, OH 45215;
phone: (513) 552-3272; email: <a href="/cdn-cgi/l/email-protection#c3a2b5aaa2b7aaacadeda5afa6a6b7b0b6b3b3acb1b783a2a6eda4a6eda0acae"><span class="__cf_email__" data-cfemail="dabbacb3bbaeb3b5b4f4bcb6bfbfaea9afaaaab5a8ae9abbbff4bdbff4b9b5b7">[email protected]</span></a>; website:
<a href="http://www.ge.com">www.ge.com</a>. 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 (781) 238-7759. It is
also available at <a href="https://www.regulations.gov">https://www.regulations.gov</a> by searching for and
locating Docket No. FAA-2021-0273.
Examining the AD Docket
You may examine the AD docket at <a href="https://www.regulations.gov">https://www.regulations.gov</a> by
searching for and locating Docket No. FAA-2021-0273; 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: Mehdi Lamnyi, Aviation Safety
Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803;
phone: (781) 238-7743; fax: (781) 238-7199; email:
<a href="/cdn-cgi/l/email-protection#1f527a777b7631537e727166765f797e7e31787069"><span class="__cf_email__" data-cfemail="2e634b464a4700624f434057476e484f4f00494158">[email protected]</span></a>.
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 all GE GEnx-1B64, GEnx-
1B64/P1, GEnx-1B64/P2, GEnx-1B67, GEnx-1B67/P1, GEnx-1B67/P2, GEnx-
1B70, GEnx-1B70/75/P1, GEnx-1B70/75/P2, GEnx-1B70/P1, GEnx-1B70/P2,
GEnx-1B70C/P1, GEnx-1B70C/P2, GEnx-1B74/75/P1, GEnx-1B74/75/P2, GEnx-
1B76/P2, GEnx-1B76A/P2, GEnx-2B67, GEnx-2B67/P, and GEnx-2B67B model
turbofan engines. The NPRM published in the Federal
[[Page 66448]]
Register on April 16, 2021 (86 FR 20094). The NPRM was prompted by a
report from the manufacturer of an in-service loss of engine thrust
control on a GE90-115B model turbofan engine on October 27, 2019, that
resulted in uncommanded high thrust. Analysis by the manufacturer found
accumulated thermal cycles of the MN4 integrated circuit in the EEC,
through normal operation, causes the solder ball joints to wear out and
eventually fail over time. Since the GE90 and the GEnx model turbofan
engines share the same EEC hardware and experience similar thermal and
vibratory environments, the manufacturer determined that GEnx model
turbofan engines are susceptible to the same type of failure. In the
NPRM, the FAA proposed to require revising the existing operator's FAA-
approved MEL by incorporating into the MEL the dispatch restrictions
listed in paragraph (g) of this AD. In the NPRM, the FAA also proposed
to require initial and repetitive replacement of the EEC MN4
microprocessor using an approved overhaul procedure. 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 nine commenters. The commenters were
Air Line Pilots Association, International (ALPA), Japan Airlines,
American Airlines (American), Cathay Pacific Airways (Cathay Pacific),
Jetstar Airways (Jetstar), GE, The Boeing Company (Boeing), United
Airlines Engineering (UAL Engineering), and United Parcel Service
(UPS). The following presents the comments received on the NPRM and the
FAA's response to each comment.
Request To Require a Revision to the Master Minimum Equipment List
ALPA and Japan Airlines suggested that the FAA modify paragraph (g)
of the NPRM to require a revision to the master minimum equipment list
(MMEL), similar to that required for the operator's FAA-approved MEL.
ALPA stated that while revising each operator's FAA-approved MEL would
be required, the NPRM does not mention revision of the MMEL through
either the Flight Operations Evaluation Board or the Aircraft
Evaluation Group process. Japan Airlines reasoned that when the
dispatch restriction is necessary, it should be specified in the MMEL,
not only in the operator's FAA-approved MEL.
The FAA disagrees. The FAA does not plan to require the requested
change to the MMEL because the required change to the MEL is an interim
action. The design approval holder is working on a terminating action
to correct the unsafe condition. The FAA did not change this AD as a
result of this comment.
Request To Clarify the Compliance for Central Maintenance Computing
Function
Japan Airlines requested that the FAA clarify which function within
the Central Maintenance Computing Function (CMCF) operators should use
to check for the engine indicating and crew alerting system (EICAS) and
maintenance message. Japan Airlines stated that Figure 1 to paragraph
(g)(1) of the NPRM does not clearly specify whether the CMCF Existing
Fault function is the only function that needs to be checked or if
other CMCF functions also need to be checked.
The FAA disagrees with the need to clarify Figure 1 to paragraph
(g)(1) of this AD to indicate which function within the CMCF operators
should use to check for EICAS and maintenance messages. The FAA notes
that operators should follow the procedures in their approved fault
isolation manuals when checking for faults. The FAA did not change this
AD as a result of this comment.
Request To Change Compliance To Include Main Channel Board
American suggested that the FAA change paragraph (g)(3) of the NPRM
from ``replace the EEC MN4 microprocessor'' to ``replace the EEC MN4
microprocessor or main channel board (MCB).'' American reasoned that
they have had to replace the MCB during EEC MN4 microprocessor repairs
due to unrelated findings. American also stated that this change would
allow such instances to take credit for satisfying the AD, which seems
to align with the intention of the NPRM based on the proposed
requirements specified in paragraph (i) of the NPRM.
The FAA acknowledges that the EEC MN4 microprocessor can be
replaced with a new one as a piece part, part of the MCB, or part of
the EEC for compliance with paragraph (g)(3) of this AD. The FAA does
not find it necessary to change this AD to reference replacement of the
MCB.
Request To Clarify Soft Time Cycles of Revised Service Information
American commented that R02 of GE GEnx-1B Service Bulletin (SB) 73-
0097, dated May 17, 2021 (GEnx-1B SB 73-0097), and GE GEnx-2B SB 73-
0090, dated May 20, 2021 (GEnx-2B SB 73-0090) include a new ``soft
time'' requirement of 9,500 cycles that should be attained before the
EEC MN4 microprocessor be replaced. American requested that if the FAA
incorporated R02 of these SBs in its AD, the FAA should explicitly
state that replacement of EEC MN4 microprocessor after the soft time of
9,500 cycles is not part of the AD requirements. American commented
that this would allow for instances where the EEC MN4 microprocessor or
MCB was replaced prior to the soft time.
This AD requires replacing the EEC MN4 microprocessor at intervals
not to exceed 11,000 cycles since new (CSN) or cycles since last
replacement. The recommended soft time of 9,500 CSN prior to replacing
the EEC MN4 microprocessor specified in R02 of GE GEnx-1B SB 73-0097
and GEnx-2B SB 73-0090, is not mandated by this AD. The FAA did not
change this AD as a result of this comment.
Request To Change Compliance To Allow Dispatch per MMEL
Cathay Pacific commented that Figure 2 to paragraph (g)(2) of the
NPRM should specify that dispatch is allowed per the MMEL or dispatch
deviation guide (DDG).
The FAA disagrees. After this AD is effective, if any of the fault
combinations defined in Figure 2 to paragraph (g)(2) of this AD are
present, then dispatch is prohibited, notwithstanding the provisions of
the MEL and the DDG. The FAA did not change this AD as a result of this
comment.
Request To Revise or Remove Installation Prohibition
Cathay Pacific, GE, and Jetstar suggested revision or removal of
paragraph (i), Installation Prohibition, of the NPRM that prohibits
installation onto any engine an EEC with an MCB that was subject to
more than three replacements of the EEC MN4 microprocessor. GE
suggested removing the Installation Prohibition altogether. Jetstar
questioned the need to include the Installation Prohibition in
paragraph (h), Definition, which defines an approved overhaul
procedure. Cathay Pacific suggested revising this paragraph to ``do not
install an EEC without compliance of the GE SB 73-0097/SB 73-0090.''
Jetstar stated that the EEC MN4 microprocessor replacement is managed
by the original equipment manufacturer's (OEM) internal maintenance
procedures, and operators do not have visibility into the number
[[Page 66449]]
of replacements that have been performed.
As stated by the commenters, the EEC MN4 microprocessor replacement
is managed by the OEM's internal maintenance procedures and, therefore,
not necessary in this AD. The FAA has removed the Installation
Prohibition from this AD.
Request To Revise Compliance Time
GE recommended that the FAA revise the compliance time in paragraph
(g) of the NPRM to account for situations in which cycles accumulated
on the EEC MN4 microprocessor cannot be determined through operator
maintenance logs or FADEC International shop visit reports. GE proposed
that, for these situations, the compliance time allow for replacing the
EEC MN4 microprocessor after 12 years since EEC entry into service
(EIS) for GEnx-1B model turbofan engines and 14 years since EEC EIS for
GEnx-2B model turbofan engines.
The FAA agrees. The commenter's recommended replacement time of 12
years and 14 years since EEC EIS for GEnx-1B and GEnx-2B model turbofan
engines, respectively, is based on the average yearly utilization of
those engines with an added margin to account for higher utilization
engines. The FAA revised paragraph (g)(3) of this AD to require
replacement of the EEC MN4 microprocessor at the compliance times noted
by GE when cycles accumulated on the EEC MN4 microprocessor cannot be
determined. This change to this AD imposes no additional burden on
operators.
Request To Update Service Information Revision
GE recommended that the FAA contact GE before publication of this
final rule to update the service bulletin references. GE commented
that, at the time of its comment, the latest issued service bulletins
are GEnx-1B SB 73-0097 R02, dated May 17, 2021, and GEnx-2B SB 73-0090
R02, dated May 20, 2021.
The FAA has updated this AD to reference GEnx-1B SB 73-0097 R02,
dated May 17, 2021, and GEnx-2B SB 73-0090 R03, dated August 18, 2021.
This change does not affect the instructions for replacing the EEC MN4
microprocessor and places no additional burden on operators.
Request To Clarify Dispatch Restrictions
Boeing requested that the FAA update Figure 1 to paragraph (g)(1)
of the NPRM to indicate ``Prior to each flight with EICAS Message ENG
EEC C1 X, check for the fault combinations in the table.'' Boeing also
requested that the FAA update Figure 2 to paragraph (g)(2) of the NPRM
to indicate ``Prior to each flight with EICAS Message ENG X EEC C1,
check for the fault combinations in the table.'' Boeing noted that
dispatch is allowed with the ENG EEC C1 L(R) status message for the
time specified in the MMEL, which may encompass several flights. Boeing
noted that new faults could arise during MMEL dispatch. Boeing
concluded that the NPRM should clarify that the inspection for the
underlying fault messages should be accomplished prior to each flight.
The FAA agrees to clarify the AD requirement for operators to check
for fault combinations prior to each flight. The FAA updated Figure 1
to paragraph (g)(1) of this AD by adding ``Prior to each flight with
engine indicating and crew alerting system (EICAS) Message ``ENG EEC C1
X'' (where ``X'' is engine position: ``L'' or ``R''), check for
faults.'' The FAA updated Figure 2 to paragraph (g)(2) of this AD by
adding ``Prior to each flight with engine indicating and crew alerting
system (EICAS) Message ``ENG X EEC C1'' (where ``X'' is engine
position: ``1,'' ``2,'' ``3,'' or ``4''), check for faults.''
Request To Add Additional Fault Codes
Boeing requested that the FAA revise Figure 2 to paragraph (g)(2)
of the NPRM to add maintenance messages 7X963 (CH A) and 7X964 (CH B).
Boeing reasoned that the TLA out of range fault is identified by
different fault codes in a new version of the maintenance computer
software. Boeing noted that adding the new fault codes would cover the
eventual release of the new fault codes.
The FAA agrees. The FAA revised Figure 2 to paragraph (g)(2) of
this AD by adding ``OR 7X963 (CH[hyphen]A)'' and ``OR 7X964
(CH[hyphen]B).''
Request To Revise Effectivity of EEC Replacement
UAL Engineering requested that the FAA update paragraph (c),
Applicability, of the NPRM to reference GE GEnx-1B SB 73-0097 for EEC
part number (P/N) applicability.
The FAA disagrees. All EEC P/Ns currently installed on affected
GEnx-1B and GEnx-2B model turbofan engines are susceptible to the
unsafe condition addressed by this AD. The FAA did not change this AD
as a result of this comment.
Request Allowance To Accomplish a Manual Review for Maintenance
Messages
UPS requested the FAA revise the NPRM to allow for the
accomplishment of a manual review to inspect for any correlated
maintenance messages on the flight leg in which the C1 fault was
present in the event that an EEC C1 EICAS message is displayed without
a correlated fault in the central maintenance computer (CMC). UPS
reasoned that both Boeing and GE have confirmed that six maintenance
messages (7x310, 7x311, 7x312, 7x069, 7x071, and 7x073) correlate to C1
faults for which the cockpit CMC screen will not show a correlation.
The FAA agrees that six maintenance messages correlate to EICAS
Message ``ENG EEC C1,'' but do not show a correlation to ``ENG EEC C1''
in the cockpit CMC screen. The CMC maintenance software lacks the
capability to correlate those six maintenance messages, and currently
the only available method for correlating those six maintenance
messages is by performing a manual review. The FAA disagrees, however,
with changing this AD, as the method for establishing correlation is
not prescribed in this AD.
Support for the AD
ALPA, Jetstar, UAL Engineering, and American expressed support for
the proposed rule with the comments previously discussed.
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 Under 1 CFR Part 51
The FAA reviewed GE GEnx-1B Service Bulletin (SB) 73-0097 R02,
dated May 17, 2021, R01, dated January 29, 2021, and R00, dated
December 17, 2020; and GE GEnx-2B SB 73-0090 R03, dated August 18,
2021, R02, dated May 20, 2021, R01, dated January 28, 2021, and R00,
dated December 17, 2020. This service information specifies procedures
for replacing the EEC MN4 microprocessor on GEnx-1B and GEnx-2B model
turbofan engines, as applicable. This service information is
[[Page 66450]]
reasonably available because the interested parties have access to it
through their normal course of business or by the means identified in
ADDRESSES.
Interim Action
The FAA considers this AD to be an interim action. If final action
is later identified, the FAA might consider additional rulemaking.
Costs of Compliance
The FAA estimates that this AD affects 308 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 operator's FAA-approved MEL.... 1 work-hour x $85 per $0 $85 $26,180
hour = $85.
Replace EEC MN4 microprocessor........ 1 work-hour x $85 per 25,200 25,285 7,787,780
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
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:
2021-21-05 General Electric Company: Amendment 39-21765; Docket No.
FAA-2021-0273; Project Identifier AD-2021-00050-E.
(a) Effective Date
This airworthiness directive (AD) is effective December 28,
2021.
(b) Affected ADs
None.
(c) Applicability
This AD applies to General Electric Company (GE) GEnx-1B64,
GEnx-1B64/P1, GEnx-1B64/P2, GEnx-1B67, GEnx-1B67/P1, GEnx-1B67/P2,
GEnx-1B70, GEnx-1B70/75/P1, GEnx-1B70/75/P2, GEnx-1B70/P1, GEnx-
1B70/P2, GEnx-1B70C/P1, GEnx-1B70C/P2, GEnx-1B74/75/P1, GEnx-1B74/
75/P2, GEnx-1B76/P2, GEnx-1B76A/P2, GEnx-2B67, GEnx-2B67/P, and
GEnx-2B67B model turbofan engines.
(d) Subject
Joint Aircraft System Component (JASC) Code 7600, Engine
Controls.
(e) Unsafe Condition
This AD was prompted by an in-service occurrence of loss of
engine thrust control resulting in uncommanded high thrust. The FAA
is issuing this AD to prevent dispatch of the airplane when certain
conditions caused by degradation of the MN4 microprocessor in the
electronic engine control (EEC) are present. The unsafe condition,
if not addressed, could result in loss of engine thrust control and
reduced control of 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 120
days of the effective date of this AD, revise the operator's
existing FAA-approved minimum equipment list (MEL) by incorporating
into the MEL the dispatch restriction specified in Figure 1 to
paragraph (g)(1) of this AD, as a required operation or maintenance
procedure.
Note 1 to paragraph (g)(1): Specific alternative MEL wording to
accomplish the actions specified in Figure 1 can be approved by the
operator's principal operations or maintenance inspector.
[[Page 66451]]
[GRAPHIC] [TIFF OMITTED] TR23NO21.189
(2) For all affected GEnx-2B model turbofan engines, within 120
days of the effective date of this AD, revise the operator's
existing FAA-approved MEL by incorporating into the MEL the dispatch
restriction specified in Figure 2 to paragraph (g)(2) of this AD, as
a required operation or maintenance procedure.
Note 2 to paragraph (g)(2): Specific alternative MEL wording to
accomplish the actions specified in Figure 2 can be approved by the
operator's principal operations or maintenance inspector.
[[Page 66452]]
[GRAPHIC] [TIFF OMITTED] TR23NO21.190
(3) For all affected engines, before the EEC reaches 11,000
cycles since new, replace the EEC MN4 microprocessor using an
approved overhaul procedure.
(i) If the number of accumulated cycles on the EEC MN4
microprocessor cannot be determined through operator maintenance
logs or FADEC International shop visit reports, before the EEC
exceeds 12 years since entry into service (EIS) for affected GEnx-1B
model turbofan engines or 14 years since EIS for affected GEnx-2B
model turbofan engines, replace the EEC MN4 microprocessor using an
approved overhaul procedure.
(ii) [Reserved]
(4) Thereafter, replace the EEC MN4 microprocessor before
accumulating 11,000 cycles since the last replacement.
(h) Definition
For the purposes of this AD, an ``approved overhaul procedure''
is one of the following:
(1) Replacement of the EEC MN4 microprocessor using FADEC
International-approved maintenance procedures; or
(2) Replacement of the EEC MN4 microprocessor using the
Accomplishment Instructions, paragraph 3., as applicable, of:
(i) GE GEnx-1B Service Bulletin (SB) 73-0097 R00, dated December
17, 2020; R01, dated January 29, 2021; or R02, dated May 17, 2021;
or
(ii) GE GEnx-2B SB 73-0090 R00, dated December 17, 2020; R01,
dated January 28, 2021; R02, dated May 20, 2021; or R03, dated
August 18, 2021.
(i) 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 (j) of this AD. Information may be emailed
to: <a href="/cdn-cgi/l/email-protection#df9e919af29e9bf29e92909c9fb9bebef1b8b0a9"><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.
(j) Related Information
For more information about this AD, contact Mehdi Lamnyi,
Aviation Safety Engineer, ECO Branch, FAA, 1200 District Avenue,
Burlington, MA 01803; phone: (781) 238-7743; fax: (781) 238-7199;
email: <a href="/cdn-cgi/l/email-protection#94d9f1fcf0fdbad8f5f9faedfdd4f2f5f5baf3fbe2"><span class="__cf_email__" data-cfemail="a3eec6cbc7ca8defc2cecddacae3c5c2c28dc4ccd5">[email protected]</span></a>.
(k) Material Incorporated by Reference
(1) The Director of the Federal Register approved the
incorporation by reference (IBR) 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) GE GEnx-1B Service Bulletin (SB) 73-0097 R02, dated May 17,
2021.
(ii) GE GEnx-1B SB 73-0097 R01, dated January 29, 2021.
(iii) GE GEnx-1B SB 73-0097 R00, dated December 17, 2020.
(iv) GE GEnx-2B SB 73-0090 R03, dated August 18, 2021.
(v) GE GEnx-2B SB 73-0090 R02, dated May 20, 2021.
(vi) GE GEnx-2B SB 73-0090 R01, dated January 28, 2021.
(vii) GE GEnx-2B SB 73-0090 R00, dated December 17, 2020.
(3) For GE 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#2342554a42574a4c4d0d454f464657505653534c51576342460d44460d404c4e"><span class="__cf_email__" data-cfemail="5736213e36233e383979313b323223242227273825231736327930327934383a">[email protected]</span></a>;
website: <a href="http://www.ge.com">www.ge.com</a>.
(4) You may view this service information at FAA, Airworthiness
Products Section, Operational Safety Branch, 1200 District Avenue,
Burlington, MA 01803. For
[[Page 66453]]
information on the availability of this material at the FAA, call
(781) 238-7759.
(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: <a href="/cdn-cgi/l/email-protection#c7a1b5e9aea9b4b7a2a4b3aea8a987a9a6b5a6e9a0a8b1"><span class="__cf_email__" data-cfemail="e78195c98e8994978284938e8889a789869586c9808891">[email protected]</span></a>, or go to: <a href="https://www.archives.gov/federal-register/cfr/ibr-locations.html">https://www.archives.gov/federal-register/cfr/ibr-locations.html</a>.
Issued on October 5, 2021.
Gaetano A. Sciortino,
Deputy Director for Strategic Initiatives, Compliance & Airworthiness
Division, Aircraft Certification Service.
[FR Doc. 2021-25491 Filed 11-22-21; 8:45 am]
BILLING CODE 4910-13-P
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</html>Indexed from Federal Register on November 23, 2021.
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.