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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2019-0597; Product Identifier 2019-NE-05-AD]
RIN 2120-AA64
Airworthiness Directives; CFM International S.A. Turbofan Engines
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Notice of proposed rulemaking (NPRM).
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SUMMARY: The FAA proposes to supersede Airworthiness Directive
(AD)
2019-12-05, which applies to certain CFM International S.A. (CFM)
CFM56-5B, CFM56-5C, and CFM56-7B model turbofan engines with a certain
rotating air high-pressure turbine (HPT) front seal. AD 2019-12-05
requires replacement of the affected rotating air HPT front seal with
a
part eligible for installation. The actions required by AD 2019-12-05
are
interim and only address the highest risk engines with an affected
rotating air HPT front seal that have a specified number of cycles since
being reconfigured. This proposed AD would require removal and replacement
of the rotating air HPT front seals installed on all CFM CFM56-5B, CFM56-
5C, and CFM56-7B model turbofan engines, including engines that have
fewer cycles since being reconfigured. The FAA is proposing this AD to
address the unsafe condition on these products.
DATES: The FAA must receive comments on this proposed AD by December
9,
2019.
ADDRESSES: You may send comments, using the procedures found in
14 CFR
11.43 and 11.45, by any of the following methods:
Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the
instructions for submitting comments.
Fax: 202-493-2251.
Mail: U.S. Department of Transportation, Docket
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New
Jersey Avenue SE, Washington, DC 20590.
Hand Delivery: Deliver to Mail address above between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
For service information identified in this NPRM, contact CFM
International Inc., Aviation Operations Center, 1 Neumann Way, M/D Room
285, Cincinnati, OH, 45125; phone: 877-432-3272; fax: 877-432-3329;
email: aviation.fleetsupport@ge.com. You may view this referenced
service information at the FAA, Engine & Propeller Standards Branch,
1200 District Avenue, Burlington, MA, 01803. For information on the
availability of this material at the FAA, call 781-238-7759.
Examining the AD Docket
You may examine the AD docket on the internet at http://www.regulations.
gov by searching for and locating Docket No. FAA-2019-0597;
or in person at Docket Operations between 9 a.m. and 5 p.m.,
Monday through Friday, except Federal holidays. The AD docket contains
this NPRM, the regulatory evaluation, any comments received, and other
information. The street address for Docket Operations is listed above.
Comments will be available in the AD docket shortly after receipt.
FOR FURTHER INFORMATION CONTACT: Christopher McGuire, Aerospace
Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803;
phone: 781-238-7120; fax: 781-238-7199; email: chris.mcguire@faa.gov.
SUPPLEMENTARY INFORMATION:
Comments Invited
The FAA invites you to send any written relevant data, views, or
arguments about this proposed AD. Send your comments to an address
listed under the ADDRESSES section. Include "Docket No. FAA-2019-0597;
Product Identifier 2019-NE-05-AD" at the beginning of your comments.
The FAA specifically invites comments on the overall regulatory,
economic, environmental, and energy aspects of this NPRM. The FAA will
consider all comments received by the closing date and may amend this
NPRM because of those comments.
The FAA will post all comments received, without change, to http://www.
regulations.gov, including any personal information you provide.
The FAA will also post a report summarizing each substantive verbal
contact received about this proposed AD.
Discussion
The FAA issued AD 2019-12-05, Amendment 39-19660 (84 FR 28717, June
20, 2019), ("AD 2019-12-05"), for all CFM CFM56-5B, CFM56-5C, and
CFM56-7B model turbofan engines with a certain rotating air HPT front
seal. AD 2019-12-05 requires replacement of the affected rotating air
HPT front seal with a part eligible for installation. AD 2019-12-05
resulted from cracks found in the rotating air HPT front seal. The FAA
issued AD 2019-12-05 to prevent failure of the rotating air HPT front
seal.
Actions Since AD 2019-12-05 Was Issued
The actions required by AD 2019-12-05 are interim and only address
the highest risk engines with an affected rotating air HPT front seal
that have a specified number of cycles since being reconfigured. The
FAA now proposes to supersede AD 2019-12-05 to require removal and
replacement of the rotating air HPT front seals installed on all CFM
CFM56-5B, CFM56-5C, and CFM56-7B model turbofan engines, including
engines that have fewer cycles since being reconfigured.
Related Service Information
The FAA reviewed CFM Service Bulletin (SB) CFM56-5B S/B 72-1074,
Revision 01, dated December 5, 2018; CFM SB CFM56-5C S/B 72-0794,
Revision 01, dated January 2, 2019; and CFM SB CFM56-7B S/B 72-1042,
Revision 01, dated January 2, 2019. CFM SB CFM56-5B S/B 72-1074,
Revision 01, describes procedures for replacement of the affected
rotating air HPT front seal on CFM CFM56-5B model turbofan engines. CFM
SB CFM56-5C S/B 72-0794, Revision 01, describes procedures for
replacement of the affected rotating air HPT front seal on CFM CFM56-5C
model turbofan engines. CFM SB CFM56-7B S/B 72-1042, Revision 01,
describes procedures for replacement of the affected rotating air HPT
front seal on CFM CFM56-7B model turbofan engines.
FAA's Determination
The FAA is proposing this AD because it evaluated all the relevant
information and determined the unsafe condition described previously is
likely to exist or develop in other products of the same type design.
Proposed AD Requirements
This proposed AD would retain all requirements of AD 2019-12-05.
This proposed AD would add CFM CFM56-5B, CFM56-5C, and CFM56-7B model
turbofan engines to the applicability.
Costs of Compliance
The FAA estimates that this proposed AD affects four engines
installed on airplanes of U.S. registry.
The FAA estimates the following costs to comply with this proposed
AD:
Estimated Costs
|
Action
|
Labor cost
|
Parts cost
|
Cost per
product
|
Cost on
U.S. operators
|
| Replace the rotating air HPT
front seal. |
1 work-hour x $85 per hour =
$85 |
$344,600
|
$344,685
|
$1,378,740
|
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.
This AD is issued in accordance with authority delegated by the
Executive Director, Aircraft Certification Service, as authorized by
FAA Order 8000.51C. In accordance with that order, issuance of ADs is
normally a function of the Compliance and Airworthiness Division, but
during this transition period, the Executive Director has delegated the
authority to issue ADs applicable to engines, propellers, and
associated appliances to the Manager, Engine and Propeller Standards
Branch, Policy and Innovation Division.
Regulatory Findings
The FAA has determined that this proposed AD would not have
federalism implications under Executive Order 13132. This proposed AD
would not have a substantial direct effect on the States, on the
relationship between the national Government and the States, or on the
distribution of power and responsibilities among the various levels of
government.
For the reasons discussed above, I certify that the proposed
regulation:
(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 Proposed Amendment
Accordingly, under the authority delegated to me by the
Administrator, the FAA proposes to amend 14 CFR part 39 as follows:
PART 39--AIRWORTHINESS DIRECTIVES
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]
2. The FAA amends Sec. 39.13 by removing Airworthiness Directive (AD)
2019-12-05, Amendment 39-19660 (84 FR 28717, June 20, 2019), and adding
the following new AD:
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