Rule2022-03039
Airworthiness Directives; CFM International, S.A. 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
February 15, 2022
Effective
March 22, 2022
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA is superseding Airworthiness Directive (AD) 2013-26-01 for all CFM International, S.A. (CFM) CFM56-3 and CFM56-7B model turbofan engines with a certain accessory gearbox assembly (AGB) not equipped with a dynamic oil seal assembly in the handcranking pad. AD 2013-26-01 required an independent inspection to verify re-installation of the handcranking pad cover after removal of the pad cover for maintenance. This AD was prompted by a dual engine loss of oil event and 42 prior events of total loss of engine oil during flight. This AD requires independent inspection to verify re-installation of the AGB handcranking pad cover after maintenance. This AD also requires the replacement of the affected AGB as a terminating action to the inspection requirement. The FAA is issuing this AD to address the unsafe condition on these products.
Full Text
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<title>Federal Register, Volume 87 Issue 31 (Tuesday, February 15, 2022)</title>
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[Federal Register Volume 87, Number 31 (Tuesday, February 15, 2022)]
[Rules and Regulations]
[Pages 8402-8406]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2022-03039]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2021-0259; Project Identifier AD-2020-01128-E;
Amendment 39-21900; AD 2022-02-03]
RIN 2120-AA64
Airworthiness Directives; CFM International, S.A. Turbofan
Engines
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule.
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SUMMARY: The FAA is superseding Airworthiness Directive (AD) 2013-26-01
for all CFM International, S.A. (CFM) CFM56-3 and CFM56-7B model
turbofan engines with a certain accessory gearbox assembly (AGB) not
equipped with a dynamic oil seal assembly in the handcranking pad. AD
2013-26-01 required an independent inspection to verify re-installation
of the handcranking pad cover after removal of the pad cover for
maintenance. This AD was prompted by a dual engine loss of oil event
and 42 prior events of total loss of engine oil during flight. This AD
requires independent inspection to verify re-installation of the AGB
handcranking pad cover after maintenance. This AD also requires the
replacement of the affected AGB as a terminating action to the
inspection requirement. The FAA is issuing this AD to address the
unsafe condition on these products.
DATES: This AD is effective March 22, 2022.
ADDRESSES: For service information identified in this final rule,
contact CFM International, S.A., Aviation Operations Center, 1 Neumann
Way, M/D Room 285, Cincinnati, OH 45125; phone: (877) 432-3272; email:
<a href="/cdn-cgi/l/email-protection#b9dfd5dcdccdcaccc9c9d6cbcdf9dedc97dad6d4"><span class="__cf_email__" data-cfemail="f1979d949485828481819e8385b19694df929e9c">[email protected]</span></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 (817) 222-5110. It is
also available at <a href="https://www.regulations.gov">https://www.regulations.gov</a> by searching for and
locating Docket No. FAA-2021-0259.
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-2021-0259; 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: Kevin Clark, Aviation Safety Engineer,
ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone:
(781) 238-7088; fax: (781) 238-7199; email: <a href="/cdn-cgi/l/email-protection#315a5447585f1f5c1f525d50435a715750501f565e47"><span class="__cf_email__" data-cfemail="016a6477686f2f6c2f626d60736a416760602f666e77">[email protected]</span></a>.
SUPPLEMENTARY INFORMATION:
Background
The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 to supersede AD 2013-26-01, Amendment 39-17710 (78 FR
79295, December 30, 2013), (AD 2013-26-01). AD 2013-26-01 applied to
all CFM CFM56-3 and CFM56-7B series turbofan engines with certain AGBs
not equipped with a dynamic oil seal in the handcranking pad assembly.
The NPRM published in the Federal Register on May 3, 2021 (86 FR
23301). The NPRM was prompted by a dual engine loss of oil event and 42
prior events of total loss of engine oil during flight. In the NPRM,
the FAA proposed to retain certain requirements of AD 2013-26-01. The
NPRM proposed to require the performance of an independent inspection
to verify re-installation of the AGB handcranking pad cover after
maintenance. Alternatively, the NPRM proposed to require the insertion
of an independent inspection as a required inspection item in the
approved continuous airworthiness maintenance program for the aircraft
not later than the next time the AGB handcranking pad cover is removed
for maintenance.
The NPRM also proposed to remove the optional terminating action in
AD 2013-26-01 and add a mandatory terminating action for certain model
turbofan engines, requiring the removal and replacement of an affected
AGB with an AGB that incorporates the dynamic oil seal in the
handcranking pad cover assembly. For all CFM56-3 and the majority of
CFM56-7B turbofan engine models, the NPRM proposed to require
replacement of the AGB as a mandatory terminating action to the
inspection requirement. The NPRM does not require this terminating
action for CFM56-7B27A, CFM56-7B27A/3 and CFM56-7B27AE model turbofan
engines because these model engines, which are installed only in
military airplanes, do not have a replacement AGB eligible for
installation. 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 Alaska Airlines, Inc. (Alaska), American Airlines (American), Air
Line Pilot Association, International (ALPA), CFM, Delta Air Lines,
Inc. (Delta), Jet Engine Technology Corporation (Jet Engine
Technology), and United Airlines (United). The following presents the
comments received on the NPRM and the FAA's response to each comment.
Request To Revise Service Bulletin (SB) References To Allow On-Wing
Procedure
Alaska requested that the FAA revise the definition in paragraph
(i)(3)(ii) of this AD to include an affected AGB that has been reworked
and reidentified to a part number (P/N) eligible for installation, as
applicable to the removed P/N, in accordance with an FAA approved CFM
International SB.
[[Page 8403]]
Alaska also commented that CFM expects to release CFM56-7B S/B 72-1023
in September 2021 and this SB would allow for introduction of AGB part
number 340-046-528-0. Alaska also noted that CFM plans to release
Revision 9 of CFM International CFM56-7B S/B 72-0564 to allow on-wing
installation of the dynamic oil seal in the handcranking pad cover
assembly.
American also requested that the FAA revise the definition in
paragraph (i)(3)(ii) of this AD to include procedures from future FAA
approved revisions of CFM SBs. American noted that CFM plans to release
Revision 9 of CFM International CFM56-7B S/B 72-0564 to allow on-wing
installation of the dynamic oil seal in the handcranking pad cover
assembly. American also requested that the FAA incorporate the
maintenance procedures from Revision 9 of CFM International SB CFM56-7B
S/B 72-0564 and CFM International SB CFM56-7B S/B 72-1071 into the
proposed AD. American noted the advantage that Revision 9 of CFM
International SB CFM56-7B S/B 72-0564 would allow the AGBs to be
modified on-wing.
Delta requested that the FAA urge CFM to make an on-wing procedure
available to operators. Delta further requested that the FAA modify the
definition of an affected AGB that has been re-worked and re-identified
to a part number eligible for installation in paragraph (i)(3)(ii) of
the NPRM by removing the specific revision numbers and effective dates
from the SBs in this paragraph. Delta commented that Revision 7 is the
current revision for CFM International SB CFM56-7B S/B 72-0879,
however, AD 2013-26-01 does not list a revision number for an AGB that
is eligible for installation in the terminating action. Further, Delta
stated that European Union Aviation Safety Agency (EASA) AD 2020-0261
allows for the modification and re-identification of an affected AGB
using future revisions of CFM International SB CFM56-7B S/B 72-0564.
In response to the comments from Alaska, American, and Delta, the
FAA changed the definition of a part eligible for installation in
paragraph (i)(3)(ii) of this AD to ``An affected AGB that, using an
FAA-approved procedure, has been re-worked with a dynamic oil seal in
the starter drive pad and re-identified with a new part number not
listed in paragraph (i)(3)(i) of this AD.'' This change allows
operators to use procedures in service bulletins that contain an FAA-
approved method for installing the dynamic oil seal in the handcranking
pad cover assembly.
Request To Update the Definition of an Engine Shop Visit
American requested that the FAA update the definition of an engine
shop visit by adding the following additional exceptions to the
definition in paragraph (i)(1) of this AD:
``(iii) The removal of the fan disk or the fan disk and booster
spool as an assembly.
(iv) Accomplishment of a top/bottom case by removal of the HPC
forward and aft stator cases.''
The FAA disagrees with revising the definition as proposed by
American. The removal of the fan, which includes the fan disk and
booster major module, is excluded from the definition of an engine shop
visit in paragraph (i)(1)(ii) of this AD. Regarding the addition of an
exception to the definition of an engine shop visit to include
accomplishment of a top/bottom case by removal of the high-pressure
compressor (HPC) forward and aft stator cases, American did not provide
rationale for this requested change. The FAA finds that incorporating
this requested exception by the commenter would unnecessarily delay the
accomplishment of the required actions of this AD.
Request To Update the Definition of a Part Eligible for Installation
Delta requested that the FAA remove the term ``using'' from the
following sentence in paragraph (i)(3)(ii): ``An affected AGB that has
been reworked and reidentified to a part number eligible for
installation using, as applicable, CFM SB 72-0879, Revision 6, dated
March 1, 2018, or SB 72-0564 Revision 8, dated May 6, 2020.'' Delta
reasoned that the cited service information does not specify which
steps or paragraphs are required for compliance.
The FAA has changed the definition in paragraph (i)(3)(ii) of this
AD to allow the use of FAA-approved methods for installing the dynamic
oil seal in the handcranking pad cover assembly rather than mandating
specific procedures.
Request To Incorporate FAA Advisory Circular (AC) Into CFM SBs
American requested that CFM incorporate FAA AC 20-176A into its SBs
to distinguish which steps in an SB will have a direct effect on
detecting, preventing, resolving, or eliminating the unsafe condition
identified in an AD. American commented further that the application of
AC 20-176A to previous CFM SBs was successful in reducing global
requests for alternative methods of compliance (AMOCs) and streamlining
the accomplishment of key tasks while meeting strict regulatory
compliance.
Delta requested that the FAA urge CFM to incorporate FAA AC 20-176A
into its SBs. Delta commented that paragraph (i)(3)(ii) defines an
affected AGB that has been reworked and reidentified to a part number
eligible for installation using, as applicable, CFM International SB
CFM56-7B S/B 72-0879, Revision 6, dated March 1, 2018, or CFM
International SB CFM56-7B S/B 72-0564, Revision 8, dated May 6, 2020.
This definition does not specify which steps or paragraphs are required
for compliance. Delta requested the FAA urge CFM to revise these SBs to
incorporate AC 20-176A to distinguish which steps in an SB will have a
direct effect on detecting, preventing, resolving, or eliminating the
unsafe condition identified in an AD.
In response to these comments from Delta and American, the FAA has
changed the definition of an AGB eligible for installation in paragraph
(i)(3)(ii) of this AD to allow the use of FAA-approved methods for
installing the dynamic oil seal in the handcranking pad cover assembly
rather than mandating specific procedures. Since the SBs noted by the
commenters are not required for compliance within this AD, the FAA does
not find it necessary to recommend that the manufacturer incorporate
sections from the guidance contained in AC 20-176A in the referenced
SBs.
Request To Revise SB References
CFM requested that the FAA revise the specified service information
in paragraph (i)(3)(ii) of the NPRM by referencing Revision 7 of CFM
International SB CFM56-7B S/B 72-0879, dated February 10, 2021. CFM
also requested that the FAA change the date of CFM International SB
CFM56-7B S/B 72-1129 from May 5, 2020 to May 6, 2020.
In response to this comment, the FAA has revised paragraph
(i)(3)(ii) by adding a Note, which refers to Revision 7 of CFM
International SB CFM 56-7B S/B 72-0879, dated February 10, 2021. The
FAA is not requiring use of CFM International SB CFM 56-7B S/B 72-0879
to rework the dynamic oil seal in the handcranking pad cover assembly.
The addition of Note 2 to paragraph (i)(3)(ii) of this AD includes
reference to procedures to install a dynamic oil seal in the
handcranking pad cover assembly, which can be found in CFM
International SB CFM56-3 S/B 72-1129, Revision 7, dated May 6, 2020.
The FAA also updated the publication date of CFM International CFM56-7B
S/B 72-1129 to May 6, 2020.
[[Page 8404]]
Request To Revise Reference to Engine Models
CFM requested that the FAA update the AD to replace references to
``CFM56-3B'' model turbofan engines with ``CFM56-3'' when referring to
all CFM56-3, CFM56-3B and CFM56-3C model turbofan engines.
The FAA notes the reference to ``CFM56-3B'' that existed in the
preamble of the NPRM has been updated to ``CFM56-3'' in the preamble of
this final rule.
Request To Clarify the Mandatory Terminating Action
CFM and United requested that the FAA clarify if paragraph (h),
Mandatory Terminating Action, requires removal and replacement of the
AGB or if the AGB can be re-worked and re-identified. The commenters
indicated that there is an on-wing re-work procedure that is being
developed to install the dynamic oil seal in the handcranking pad cover
assembly, and using only the term ``replace'' may prevent the use of
this re-work for compliance. United also requested that the FAA clarify
whether compliance with the mandatory terminating action can be
achieved only by removing and replacing the AGB, or if re-working and
re-identifying the AGB, per the instructions in CFM International
CFM56-7B S/B 72-0564 and CFM International SB CFM56-7B S/B 72-0879 for
the CFM56-7B engine fleet is acceptable.
The FAA agrees that re-working and re-identifying the AGB on-wing
to install a dynamic oil seal in the handcranking pad cover assembly
resolves the unsafe condition. The FAA has revised paragraph (i)(2)(ii)
in this final rule to allow re-work and re-identification of the
affected AGB to a part eligible for installation.
Request To Modify Compliance Time for Mandatory Terminating Action
Delta requested that the FAA modify the compliance time for AGB
replacement in Mandatory Terminating Action, paragraph (h)(2), of the
proposed AD for affected CFM56-7B model turbofan engines to be
consistent with the requirement for CFM56-3 model turbofan engines.
Delta noted that both engine models are subject to the same unsafe
condition.
The FAA disagrees with modifying the mandatory terminating action
compliance time in paragraph (h)(2) for CFM56-7B model turbofan engines
to be consistent with the mandatory terminating action compliance time
for CFM56-3 model turbofan engines. The fleets using these engine
models have differences in utilization and logistics that require
different compliance end dates to address the unsafe condition.
Request for Alternative Procedure for Compliance
Jet Engine Technology commented that it has attempted to purchase
the dynamic oil seal, part number 333-089-185-000, listed in CFM
International SB CFM56-7B S/B 72-1129, Revision 7, but was informed it
was out of stock as of May 26, 2021. According to Jet Engine
Technology, there was a 360-day lead time to obtain this part. Jet
Engine Technology indicated that due to the unavailability of the parts
and because the AD is mandating the terminating action at next shop
visit after the effective date of the AD, it will not be possible for
an FAA-certified repair station to return the engine back to service.
Jet Engine Technology requested information pertaining to other types
of procedures that can be done to return the engine to service after a
shop visit.
CFM has confirmed to the FAA that parts will be available to
suppliers, operators, and repair stations to install an AGB with the
dynamic oil seal in the handcranking cover pad assembly.
Request To Delay Publication of This AD
United and CFM requested that the FAA delay publication of this AD.
United requested that the FAA wait until after CFM has made on-wing
instructions available for accomplishing the AGB re-work and re-
identification because CFM International CFM56-7B SB 72-0564, Revision
8, dated May 6, 2020, and CFM International CFM56-7B S/B 72-0879,
Revision 6, dated March 1, 2018 do not contain instructions for on-wing
accomplishment. CFM requested that the FAA delay publication until
Revision 9 of CFM International CFM56-7B S/B 72-0564 and the initial
version of CFM International CFM56-7B S/B 72-1071 are published as
these SBs will provide instructions for the on-wing modification to
install the dynamic oil seal in the handcranking pad cover assembly.
The FAA disagrees with delaying publication of this AD based on the
anticipated issuance of CFM service information. Publication of this AD
at this time is necessary to address the unsafe condition. However, the
FAA has updated this AD, in response to similar comments, to allow for
any FAA approved method, including an on-wing procedure, to install an
AGB with a dynamic oil seal in the handcranking pad cover assembly.
Request for Clarification on Compliant AGB Part Numbers
United requested that the FAA clarify whether CFM engines that have
compliant AGB part numbers installed (whether by removal and
replacement or by re-working and re-identifying the AGB) are required
to have the independent inspection of the AGB handcranking pad cover
performed to verify re-installation after maintenance.
As set forth in paragraph (h), Mandatory Terminating Action, the
requirements of paragraph (g) of this AD are terminated after the
accomplishment of the mandatory terminating action. Further, paragraph
(f) of this AD mandates compliance with the required actions, unless
already done.
Support for the NPRM
ALPA supported the NPRM without change.
Conclusion
The FAA reviewed the relevant data, considered any comments
received, and determined that air safety requires adopting the 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 CFM International Service Bulletin (SB) CFM56-7B
S/B 72-0879, Revision 7, dated February 10, 2021 (CFM SB 72-0879); CFM
International SB CFM56-3 S/B 72-1129, Revision 7, dated May 6, 2020
(CFM SB 72-1129); CFM International SB CFM56-7B S/B 72-0564 Revision 9,
dated December 3, 2021 (CFM SB 72-0564); and CFM56-7B S/B 72-1071,
initial issue, dated December 3, 2021 (CFM SB 72-1071). CFM SB 72-1129
describes procedures for the introduction of a new starter drive pad,
new handcranking cover assembly, and re-working and re-identifying an
AGB installed on CFM56-3 model turbofan engines. CFM SB 72-0879, CFM SB
72-0564 and CFM SB 72-1071 describe procedures for the introduction of
a new starter drive pad, new handcranking cover, and re-working and re-
identifying an AGB installed on CFM56-7B model turbofan engines. This
service information is reasonably available because the interested
parties have access to it through their normal course of business or by
the means identified in ADDRESSES.
[[Page 8405]]
Costs of Compliance
The FAA estimates that this AD affects 700 engines installed on
airplanes of U.S. registry. The FAA estimates that the majority of
operators will perform the repair and re-identification of the AGB
rather than replace the AGB with a zero hour part. For the purpose of
this cost estimate, the FAA estimates that 95% of AGBs will be repaired
and re-identified while 5% of AGBs will be replaced with a zero hour
AGB.
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
----------------------------------------------------------------------------------------------------------------
Independent Inspection................ 1 work-hour x $85 per $0 $85 $59,500
hour = $85.
Insert inspection item into aircraft 1 work-hour x $85 per 0 85 59,500
maintenance program. hour = $85.
Re-work and re-identify AGB........... 4 work-hours x $85 per 12,000 12,340 8,206,100
hour = $340.
Replace AGB with zero hour AGB........ 4 work-hours x $85 per 526,700 527,040 18,446,400
hour = $340.
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Authority for This Rulemaking
Title 49 of the United States Code specifies the FAA's authority to
issue rules on aviation safety. Subtitle I, Section 106, describes the
authority of the FAA Administrator. Subtitle VII, Aviation Programs,
describes in more detail the scope of the Agency's authority.
The FAA is issuing this rulemaking under the authority described in
Subtitle VII, Part A, Subpart III, Section 44701, General requirements.
Under that section, Congress charges the FAA with promoting safe flight
of civil aircraft in air commerce by prescribing regulations for
practices, methods, and procedures the Administrator finds necessary
for safety in air commerce. This regulation is within the scope of that
authority because it addresses an unsafe condition that is likely to
exist or develop on products identified in this rulemaking action.
Regulatory Findings
The FAA has determined that 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:
0
a. Removing airworthiness directive 2013-26-01, Amendment 39-17710 (78
FR 79295, December 30, 2013); and
0
b. Adding the following new airworthiness directive:
2022-02-03 CFM International, S.A.: Amendment 39-21900; Docket No.
FAA-2021-0259; Project Identifier AD-2020-01128-E.
(a) Effective Date
This airworthiness directive (AD) is effective March 22, 2022.
(b) Affected ADs
This AD replaces AD 2013-26-01, Amendment 39-17710 (78 FR 79295,
December 30, 2013).
(c) Applicability
This AD applies to CFM International, S.A. CFM56-3 and CFM56-7B
model turbofan engines equipped with an accessory gearbox (AGB)
assembly with the following part numbers (P/Ns):
(1) For CFM56-3, CFM56-3B, and CFM56-3C model turbofan engines,
AGB P/N: 335-300-103-0, 335-300-105-0, 335-300-106-0, 335-300-107-0,
335-300-108-0, 335-300-109-0, or 335-300-110-0, installed.
(2) For CFM56-7B20, CFM56-7B20/2, CFM56-7B20/3, CFM56-7B22,
CFM56-7B22/2, CFM56-7B22/3, CFM56-7B22/3B1, CFM56-7B22/B1, CFM56-
7B24, CFM56-7B24/2, CFM56-7B24/3, CFM56-7B24/3B1, CFM56-7B24/B1,
CFM56-7B26, CFM56-7B26/2, CFM56-7B26/3, CFM56-7B26/3B1, CFM56-7B26/
3B2, CFM56-7B26/3B2F, CFM56-7B26/3F, CFM56-7B26/B1, CFM56-7B26/B2,
CFM56-7B27, CFM56-7B27/2, CFM56-7B27/3, CFM56-7B27/3B1, CFM56-7B27/
3B1F, CFM56-7B27/3B3, CFM56-7B27/3F, CFM56-7B27/B1, and CFM56-7B27/
B3 model turbofan engines, AGB P/N: 340-046-503-0, 340-046-504-0, or
340-046-505-0, installed.
(3) For CFM56-7B27A, CFM56-7B27A/3, or CFM56-7B27AE model
turbofan engines, AGB P/N: 340-188-601-0, 340-188-603-0, or 340-188-
605-0, installed.
(d) Subject
Joint Aircraft System Component (JASC) Code 7260, Turbine Engine
Accessory Drive.
(e) Unsafe Condition
This AD was prompted by a dual engine loss of oil event and 42
prior events of total loss of engine oil during flight. The FAA is
issuing this AD to prevent loss of engine oil while in flight. The
unsafe condition, if not addressed, could result in engine failure,
loss of thrust control, reduced control of the aircraft, and damage
to the airplane.
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(g) Required Actions
(1) After the effective date of this AD, after any maintenance
that involves removal and re-installation of the AGB handcranking
pad cover, perform an independent inspection to verify re-
installation of the AGB handcranking pad cover; or
(2) Prior to the next removal of the AGB handcranking pad cover
from the engine, insert the independent inspection required by
paragraph (g)(1) of this AD as a required inspection item in the
existing approved continuous airworthiness maintenance program for
the aircraft.
(h) Mandatory Terminating Action
As a mandatory terminating action to the requirements of
paragraph (g) of this AD:
(1) For affected CFM56-3, CFM56-3B, and CFM56-3C model turbofan
engines, at the next engine shop visit, or before December 31, 2026,
whichever occurs first after the effective date of this AD, replace
the affected AGB with a part eligible for installation.
(2) For affected CFM56-7B model turbofan engines, except for
CFM56-7B27A, CFM56-
[[Page 8406]]
7B27A/3 and CFM56-7B27AE model turbofan engines, at the next engine
shop visit, or before December 31, 2024, whichever occurs first
after the effective date of this AD, replace the affected AGB with a
part eligible for installation.
(i) Definition
(1) For the purpose of this AD, an ``engine shop visit'' is the
induction of an engine into the shop for maintenance involving the
separation of pairs of major mating engine case flanges, except for
the following situations, which do not constitute an engine shop
visit:
(i) Separation of engine flanges solely for the purposes of
transportation of the engine without subsequent maintenance; or
(ii) Separation of engine flanges solely for the purpose of
replacing the fan or propulsor without subsequent maintenance.
(2) For the purpose of this AD, for affected CFM56-3, CFM56-3B,
and CFM56-3C model turbofan engines, a part eligible for
installation is:
(i) An AGB with a P/N other than 340-046-503-0, 340-046-504-0,
or 340-046-505-0; or
(ii) An AGB that, using an FAA-approved procedure, has been re-
worked with a dynamic oil seal in the handcranking pad cover
assembly and re-identified with a new P/N not listed in paragraph
(i)(2)(i) of this AD.
Note 1 to paragraph (i)(2)(ii): Procedures to install a dynamic
oil seal in the handcranking pad cover assembly can be found in CFM
International SB CFM56-3 S/B 72-1129, Revision 7, dated May 6, 2020.
(3) For the purpose of this AD, for affected CFM56-7B model
turbofan engines, except for CFM56-7B27A, CFM56-7B27A/3 and CFM56-
7B27AE model turbofan engines, a part eligible for installation is:
(i) An AGB with a P/N other than 340-046-503-0, 340-046-504-0,
or 340-046-505-0; or
(ii) An affected AGB that, using an FAA-approved procedure, has
been re-worked with a dynamic oil seal in the handcranking pad cover
assembly and re-identified with a new P/N not listed in paragraph
(i)(3)(i) of this AD.
Note 2 to paragraph (i)(3)(ii): Procedures to install a dynamic
oil seal in the handcranking pad cover assembly can be found in CFM
International SB CFM56-7B S/B 72-0879, Revision 7, dated February
10, 2021, CFM56-7B S/B 72-0564, Revision 9, dated December 3, 2021,
or CFM56-7B S/B 72-1071, initial issue, dated December 3, 2021.
(j) 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 (k) of this AD. You may email your request
to: <a href="/cdn-cgi/l/email-protection#fcbdb2b9d1bdb8d1bdb1b3bfbc9a9d9dd29b938a"><span class="__cf_email__" data-cfemail="7d3c3338503c39503c30323e3d1b1c1c531a120b">[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.
(k) Related Information
For more information about this AD, contact Kevin Clark,
Aviation Safety Engineer, ECO Branch, FAA, 1200 District Avenue,
Burlington, MA 01803; phone: (781) 238-7088; fax: (781) 238-7199;
email: <a href="/cdn-cgi/l/email-protection#79121c0f10175714571a15180b12391f1818571e160f"><span class="__cf_email__" data-cfemail="89e2ecffe0e7a7e4a7eae5e8fbe2c9efe8e8a7eee6ff">[email protected]</span></a>.
(l) Material Incorporated by Reference
None.
Issued on January 6, 2022.
Lance T. Gant,
Director, Compliance & Airworthiness Division, Aircraft Certification
Service.
[FR Doc. 2022-03039 Filed 2-14-22; 8:45 am]
BILLING CODE 4910-13-P
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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.