[Federal Register Volume 84, Number 183 (Friday, September 20, 2019)]
[Proposed Rules]
[Pages 49487-49490]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2019-20054]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2019-0568; Product Identifier 2019-NE-20-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 adopt a new airworthiness directive (AD)
for all CFM International, S.A. (CFM) CFM56-5B and CFM56-7B model
turbofan engines with a certain high-pressure turbine (HPT) inner
stationary seal installed. This proposed AD was prompted by cracks
found in the rotating air HPT front seal. This proposed AD would
require removal, inspection, and replacement of the affected HPT inner
stationary seal, and depending on the findings, removal and replacement
of the rotating air HPT front seal. 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 November 4,
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: [email protected]. You may view this service
information at the FAA, Engine and 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-
0568; 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: [email protected].
SUPPLEMENTARY INFORMATION:
[[Page 49488]]
Comments Invited
The FAA invites you to send any written relevant data, views, or
arguments about this proposal. Send your comments to an address listed
under the ADDRESSES section. Include ``Docket No. FAA-2019-0568;
Product Identifier 2019-NE-20-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 NPRM.
Discussion
The FAA received a report that two cracks were discovered on a CFM
CFM56-5B model turbofan engine rotating air HPT front seal during a
routine engine shop visit. After investigation, CFM determined that the
HPT inner stationary seal, part number 1808M56G01, may not have
received the correct braze heat treat cycle at the time of the
honeycomb replacement. As a result, the affected HPT inner stationary
seal could lead to a localized separation of the replaced honeycomb,
which may affect the life of the rotating air HPT front seal. This
condition, if not addressed, could result in an uncontained release of
the rotating air HPT front seal, damage to the engine, and damage to
the airplane.
Related Service Information Under 1 CFR Part 51
The FAA reviewed CFM Service Bulletin (SB) CFM56-5B S/B 72-0952,
dated April 23, 2019, and CFM SB CFM56-7B S/B 72-1054, dated April 23,
2019. CFM SB CFM56-5B S/B 72-0952, dated April 23, 2019, describes
procedures for repairing the CFM56-5B turbofan engine HPT inner
stationary seal honeycomb. CFM SB CFM56-7B S/B 72-1054, dated April 23,
2019, describes procedures for repairing the CFM56-7B turbofan engine
HPT inner stationary seal honeycomb. 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
the ADDRESSES section.
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 require removal, inspection, and replacement
of the affected HPT inner stationary seal and, depending on the
findings, removal and replacement of the rotating air HPT front seal
with a part eligible for installation.
Costs of Compliance
The FAA estimates that this proposed AD affects 210 engines
installed on airplanes of U.S. registry. Operators have the option to
replace or repair the affected HPT inner stationary seal. The part cost
is for replacement with a repaired HPT inner stationary seal.
The FAA estimates the following costs to comply with this proposed
AD:
Estimated Costs
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Cost per Cost on U.S.
Action Labor cost Parts cost product operators
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Replace HPT inner stationary seal..... 1 work-hour x $85 per $7,910 $7,995 $1,678,950
hour = $85.
Inspect HPT inner stationary seal..... 1 work-hour x $85 per 0 85 17,850
hour = $85.
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The FAA estimates the following costs to do any necessary
replacements that would be required based on the results of the
proposed inspection. The FAA has no way of determining the number of
engines that might need these replacements:
On-Condition Costs
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Cost per
Action Labor cost Parts cost product
----------------------------------------------------------------------------------------------------------------
Replace rotating air HPT front seal........... 1 work-hour x $85 per hour = $85 $344,600 $344,685
Inspect HPT rotor blade internal cavities..... 1 work-hour x $85 per hour = $85 0 85
Replace HPT rotor blade (pair)................ 1 work-hour x $85 per hour = $85 31,000 31,085
Replace No. 3 ball bearing.................... 1 work-hour x $85 per hour = $85 30,000 30,085
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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.
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.
[[Page 49489]]
Regulatory Findings
The FAA determined that this proposed AD would not have federalism
implications under Executive Order 13132. This proposed AD would not
have a substantial direct effect on the States, on the relationship
between the national government and the States, or on the distribution
of power and responsibilities among the various levels of government.
For the reasons discussed above, I certify this proposed
regulation:
(1) Is not a ``significant regulatory action'' under Executive
Order 12866,
(2) 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
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 (AD):
CFM International, S.A.: Docket No. FAA-2019-0568; Product
Identifier 2019-NE-20-AD.
(a) Comments Due Date
The FAA must receive comments by November 4, 2019.
(b) Affected ADs
None.
(c) Applicability
(1) This AD applies to all CFM International, S.A. (CFM) CFM56-
5B1, -5B1/2P, -5B1/3, -5B1/P, -5B2, -5B2/2P, -5B2/3, -5B2/P, -5B3/
2P, -5B3/2P1, -5B3/3, -5B3/3B1, -5B3/P, -5B3/P1, -5B4, -5B4/2P, -
5B4/2P1, -5B4/3, -5B4/3B1, -5B4/P, -5B4/P1, -5B5, -5B5/3, -5B5/P, -
5B6, -5B6/2P, -5B6/3, -5B6/P, -5B7, -5B7/3, -5B7/P, -5B8/3, -5B8/P,
-5B9/2P, -5B9/3, -5B9/P, CFM56-7B20, -7B20/2, -7B20/3, -7B20E, -
7B22, -7B22/2, -7B22/3, -7B22/3B1, -7B22/B1, -7B22E, -7B22E/B1, -
7B24, -7B24/2, -7B24/3, -7B24/3B1, -7B24/B1, -7B24E, -7B24E/B1, -
7B26, -7B26/2, -7B26/3, -7B26/3B1, -7B26/3B2, -7B26/3B2F, -7B26/3F,
-7B26/B1, -7B26/B2, -7B26E, -7B26E/B1, -7B26E/B2, -7B26E/B2F, -
7B26E/F, -7B27, -7B27/2, -7B27/3, -7B27/3B1, -7B27/3B1F, -7B27/3B3,
-7B27/3F, -7B27/B1, -7B27/B3, -7B27A, -7B27A/3, -7B27AE, -7B27E, -
7B27E/B1, -7B27E/B1F, -7B27E/B3, and -7B27E/F model turbofan engines
with a high-pressure turbine (HPT) inner stationary seal, part
number (P/N) 1808M56G01 installed that has a serial number (S/N)
listed in Planning Information, Paragraph 1.A., Table 1, of CFM
Service Bulletin (SB) CFM56-5B S/B 72-0952, dated April 23, 2019, or
in Planning Information, Paragraph 1.A., Table 1, CFM SB CFM56-7B S/
B 72-1054, dated April 23, 2019, installed.
(2) This AD does not apply to affected CFM CFM56-5B and CFM56-7B
model turbofan engines with the affected HPT inner stationary seal
installed if the seal has been repaired as specified in CFM56-5B
Engine Shop Manual (ESM), 72-41-03, REPAIR 003, or CFM56-7B ESM, 72-
41-03, REPAIR 003, after the year listed in Paragraph 1.A., Table 1,
of CFM SB CFM56-5B S/B 72-0952 dated April 23, 2019, or Paragraph
1.A., Table 1, CFM SB CFM56-7B S/B 72-1054, dated April 23, 2019.
(d) Subject
Joint Aircraft System Component (JASC) Code 7230, Turbine Engine
Compressor Section.
(e) Unsafe Condition
This AD was prompted by cracks found in the rotating air HPT
front seal. The FAA is issuing this AD to prevent failure of the HPT
inner stationary seal and the rotating air HPT front seal. The
unsafe condition, if not addressed, could result in uncontained
release of the rotating air HPT front seal, 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) At the next engine shop visit after the effective date of
this AD, remove the affected HPT inner stationary seal from service
and replace with a HPT inner stationary seal (that is not listed in
Planning Information, Paragraph 1.A., Table 1, of CFM SB CFM56-5B S/
B 72-0952, dated April 23, 2019, or in Planning Information,
Paragraph 1.A., Table 1, CFM SB CFM56-7B S/B 72-1054, dated April
23, 2019) or a repaired HPT inner stationary seal that is eligible
for installation per the definition in paragraph (h)(2) of this AD.
(2) After removing the affected HPT inner stationary seal
required by paragraph (g)(1), inspect the removed HPT inner
stationary seal for honeycomb separation, as defined in the
Accomplishment Instructions, paragraph 3.C.(1), in CFM SB CFM56-5B
S/B 72-0952, dated April 23, 2019, or in CFM SB CFM56-7B S/B 72-
1054, dated April 23, 2019.
(3) If honeycomb separation is found during the inspection
required by paragraph (g)(2) of this AD, before further flight:
(i) Remove the rotating air HPT front seal from service and
replace with a part eligible for installation.
(ii) Inspect the HPT rotor blade internal cavities for honeycomb
metal debris per the Accomplishment Instructions, paragraph
3.C.(1)(a)(4), of CFM SB CFM56-5B S/B 72-0952, dated April 23, 2019,
or CFM SB CFM56-7B S/B 72-1054, dated April 23, 2019. If honeycomb
metal debris is found, remove the HPT rotor blade from service and
replace with a part eligible for installation.
(iii) Remove the No. 3 ball bearing from service and replace
with a part eligible for installation.
(h) 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 that
the separation of engine flanges solely for the purposes of
transportation without subsequent maintenance does not constitute an
engine shop visit.
(2) For the purpose of this AD, a repaired HPT inner stationary
seal that is eligible for installation is any HPT inner stationary
seal, P/N 1808M56G01 and with a S/N listed in Paragraph 1.A., Table
1, of CFM SB CFM56-5B S/B 72-0952, dated April 23, 2019, or
Paragraph 1.A., Table 1, CFM SB CFM56-7B S/B 72-1054, dated April
23, 2019 that has been repaired per CFM56-5B ESM, 72-41-03, REPAIR
003, or CFM56-7B ESM, 72-41-03, REPAIR 003, after the year listed in
Paragraph 1.A., Table 1, of CFM SB CFM56-5B S/B 72-0952, dated April
23, 2019, or Paragraph 1.A., Table 1, CFM SB CFM56-7B S/B 72-1054,
dated April 23, 2019.
(i) No Reporting Requirement
The reporting requirements contained within the SBs referenced
in paragraph (g) of this AD are not required by this AD.
(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)(1) of this AD. You may email your
request 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.
(k) Related Information
(1) For more information about this AD, contact Christopher
McGuire, Aerospace Engineer, ECO Branch, FAA, 1200 District Avenue,
Burlington, MA 01803; phone: 781-238-7120; fax: 781-238-7199; email:
[email protected].
(2) For service information identified in this AD, contact CFM
International Inc., Aviation Operations Center, 1 Neumann
[[Page 49490]]
Way, M/D Room 285, Cincinnati, OH 45125; phone: 877-432-3272; fax:
877-432-3329; email: [email protected]. 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.
Issued in Burlington, Massachusetts, on September 11, 2019.
Robert J. Ganley,
Manager, Engine and Propeller Standards Branch, Aircraft Certification
Service.
[FR Doc. 2019-20054 Filed 9-19-19; 8:45 am]
BILLING CODE 4910-13-P