Airworthiness Directives; CFM International S.A. Turbofan Engines
| Published date | 18 June 2019 |
| Record Number | 2019-13022 |
| Section | Rules and Regulations |
| Court | Federal Aviation Administration |
Federal Register, Volume 84 Issue 117 (Tuesday, June 18, 2019)
[Federal Register Volume 84, Number 117 (Tuesday, June 18, 2019)]
[Rules and Regulations]
[Pages 28202-28205]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2019-13022]
=======================================================================
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2019-0414; Product Identifier 2019-NE-15-AD; Amendment
39-19656; AD 2019-12-01]
RIN 2120-AA64
Airworthiness Directives; CFM International S.A. Turbofan Engines
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule; request for comments.
-----------------------------------------------------------------------
SUMMARY: The FAA is adopting a new airworthiness directive (AD) for
certain CFM International S.A. (CFM) LEAP-1B21, -1B23, -1B25, -1B27, -
1B28, -1B28B1, -1B28B2, -1B28B3, -1B28B2C, -1B28BBJ1, and -1B28BBJ2
model turbofan engines. This AD requires initial and repetitive
inspections of the transfer gearbox (TGB) scavenge screens and,
depending on the results of the inspection, possible removal of the
engine from service. This AD was prompted by multiple reports of in-
flight shutdowns (IFSDs) due to radial drive shaft (RDS) bearing
failure. The FAA is issuing this AD to address the unsafe condition on
these products.
DATES: This AD is effective July 3, 2019.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of July 3,
2019.
The FAA must receive comments on this AD by August 2, 2019.
[[Page 28203]]
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: U.S. Department of Transportation, Docket
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New
Jersey Avenue SE, Washington, DC 20590, between 9 a.m. and 5 p.m.,
Monday through Friday, except Federal holidays.
For service information identified in this final rule, 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. It is also
available on the internet at http://www.regulations.gov by searching
for and locating Docket No. FAA-2019-0414.
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-
0414; 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, the regulatory evaluation, any comments received, and
other information. The street address for the 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:
Discussion
The FAA learned of five commanded IFSD events that occurred on
certain CFM LEAP-1B model turbofan engines beginning in August 2018.
CFM's investigations identified debris on the TGB scavenge screen, A-
sump screen, and other screens. Subsequently, CFM determined that these
IFSD events were the result of inadequate oil flow to the RDS bearing,
which caused the RDS bearing cage to fail. This condition, if not
addressed, could result in failure of one or more engines, loss of
thrust control, and loss of the airplane. The FAA is issuing this AD to
address the unsafe condition on these products.
Related Service Information Under 1 CFR part 51
The FAA reviewed CFM Service Bulletin (SB) LEAP-1B-72-00-0222-01A-
930A-D, Issue 007, dated May 17, 2019. The SB describes procedures for
inspections of TGB scavenge screens and borescope inspection (BSI) of
the RDS bearing. 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.
Other Related Service Information
The FAA reviewed CFM SB LEAP-1B-72-00-0256-01A-930A-D, Issue 003,
dated May 17, 2019. The SB describes procedures for an optional BSI of
the RDS bearing. CFM has cancelled this SB and transferred its content
to CFM SB LEAP-1B-72-00-0222-01A-930A-D, Issue 007, dated May 17, 2019.
FAA's Determination
The FAA is issuing 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.
AD Requirements
This AD requires initial and repetitive inspections of the TGB
scavenge screens and, depending on the results of the inspection,
possible removal of the engine from service.
Interim Action
The FAA considers this AD interim action. The manufacturer is
currently developing a modification that will address the unsafe
condition identified in this AD. Once this modification is developed,
approved, and available, the FAA might consider additional rulemaking.
FAA's Justification and Determination of the Effective Date
An unsafe condition exists that requires the immediate adoption of
this AD without providing an opportunity for public comments prior to
adoption. The FAA has found that the risk to the flying public
justifies waiving notice and comment prior to adoption of this rule.
The affected CFM LEAP-1B model turbofan engines experienced multiple
RDS bearing cage failures in the last five months resulting in five
IFSDs. The TGB scavenge screens must be inspected before accumulating
between 100-250 flight hours since new on the RDS bearing or within 50
FHs after the effective date of this AD to prevent the failure of the
RDS bearing, which could lead to in-flight shutdown of both engines,
loss of thrust control, and loss of the airplane. Therefore, the FAA
finds good cause that notice and opportunity for prior public comment
are impracticable. In addition, for the reason stated above, the FAA
finds that good cause exists for making this amendment effective in
less than 30 days.
Comments Invited
This AD is a final rule that involves requirements affecting flight
safety and was not preceded by notice and an opportunity for public
comment. However, the FAA invites you to send any written data, views,
or arguments about this final rule. Send your comments to an address
listed under the ADDRESSES section. Include the docket number FAA-2019-
0414 and Product Identifier 2019-NE-15-AD at the beginning of your
comments. The FAA specifically invites comments on the overall
regulatory, economic, environmental, and energy aspects of this final
rule. The FAA will consider all comments received by the closing date
and may amend this final rule 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 final rule.
Regulatory Flexibility Act
The requirements of the Regulatory Flexibility Act (RFA) do not
apply when an agency finds good cause pursuant to 5 U.S.C. 553 to adopt
a rule without prior notice and comment. Because the FAA has determined
that it has good cause to adopt this rule without notice and comment,
RFA analysis is not required.
Costs of Compliance
The FAA estimates that this AD affects 136 engines installed on
airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:
[[Page 28204]]
Estimated Costs
----------------------------------------------------------------------------------------------------------------
Cost per Cost on U.S.
Action Labor cost Parts cost product operators
----------------------------------------------------------------------------------------------------------------
Inspect TGB scavenge screens.......... 1 work-hour x $85 per $0 $85 $11,560
hour = $85.
----------------------------------------------------------------------------------------------------------------
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
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, and
(2) Will not affect intrastate aviation in Alaska.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by
reference, Safety.
Adoption of 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 (AD):
2019-12-01 CFM International S.A.: Amendment 39-19656; Docket No.
FAA-2019-0414; Product Identifier 2019-NE-15-AD.
(a) Effective Date
This AD is effective July 3, 2019.
(b) Affected ADs
None.
(c) Applicability
This AD applies to all CFM International S.A. (CFM) LEAP-1B21, -
1B23, -1B25, -1B27, -1B28, -1B28B1, -1B28B2, -1B28B3, -1B28B2C, -
1B28BBJ1, and -1B28BBJ2 model turbofan engines with radial drive
shaft (RDS) bearing, part number (P/N) 92D08200 or P/N 92D08201,
installed.
(d) Subject
Joint Aircraft System Component (JASC) Code 7260, Turbine Engine
Accessory Drive.
(e) Unsafe Condition
This AD was prompted by multiple reports of in-flight shutdowns
(IFSDs) due to RDS bearing cage failure. The FAA is issuing this AD
to prevent failure of the RDS bearing. The unsafe condition, if not
addressed, could result in failure of one or more engines, loss of
thrust control, and loss of the airplane.
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(g) Required Actions
(1) Inspect the transfer gearbox (TGB) 1 and TGB2 scavenge
screens in accordance with the Accomplishment Instructions,
paragraph 5.A.(1), of CFM Service Bulletin (SB) LEAP-1B-72-00-0222-
01A-930A-D, Issue 007, dated May 17, 2019, as follows:
(i) For affected engines with engine serial number (ESN) 602499
and lower:
(A) After the RDS bearing accumulates 50 flight hours (FHs)
since new but before accumulating 250 FHs since new, or within 50
FHs after the effective date of this AD, whichever occurs later,
perform an initial inspection of the TGB1 and TGB2 scavenge screens.
(B) Thereafter, perform repetitive inspections of the TGB1 and
TGB2 scavenge screens at intervals not exceeding 250 FHs since the
last inspection.
(ii) For affected engines with ESN 602500 and higher:
(A) After the RDS accumulates 50 FHs since new but before
accumulating 100 FHs since new, or within 50 FHs after the effective
date of this AD, whichever occurs later, perform an initial
inspection of the TGB1 and TGB2 scavenge screens.
(B) Thereafter, perform repetitive inspections of the TGB1 and
TGB2 scavenge screens at intervals not exceeding 100 FHs since the
last inspection.
(iii) Based on the results of these inspections, remove the
engine from service or return the engine to service using the
criteria in the Accomplishment Instructions, Paragraphs 5.A.(2)
through 5.A.(5), of CFM SB LEAP-1B-72-00-0222-01A-930A-D, Issue 007,
dated May 17, 2019.
(2) [Reserved]
(h) Optional Borescope Inspection (BSI)
(1) Once the RDS bearing has accumulated 1,000 FHs since new,
you may perform a BSI of the RDS bearing in accordance with the
Accomplishment Instructions, paragraphs 5.B.(1) through 5.B.(8), of
CFM SB LEAP-1B-72-00-0222-01A-930A-D dated May 17, 2019. If the
results of this BSI are ``satisfactory'' according to the criteria
in the Accomplishment Instructions, paragraphs 5.B.(6)(g), of CFM SB
LEAP-1B-72-00-0222-01A-930A-D, Issue 007, dated May 17, 2019, then
you are not required to perform the repetitive inspections in
paragraphs (g)(1)(i)(B) or (g)(1)(ii)(B) of this AD until the RDS
bearing accumulates 4,250 FHs since new.
(2) [Reserved]
(i) Optional Terminating Action
(1) As an optional terminating action to the repetitive
inspections required by paragraphs (g)(1)(i)(B) and (g)(1)(ii)(B) of
this AD, you may perform a BSI of the RDS bearing in accordance with
the Accomplishment Instructions, Paragraphs 5.B.(1) through 5.B.(8),
of CFM SB LEAP-1B-72-00-0222-01A-930A-D, Issue 007, dated May 17,
2019 after the RDS bearing accumulates 3,750 FHs since new.
(i) If the results of the BSI are ``satisfactory'' using the
criteria in Accomplishment Instructions, paragraph 5.B.(6)(g), of
CFM SB LEAP-1B-72-00-0222-01A-930A-D, Issue 007, dated May 17, 2019,
then you have met the repetitive inspection requirements of this AD
and no further action is required.
[[Page 28205]]
(ii) If the results of the BSI are ''unsatisfactory'' using the
criteria in Accomplishment Instructions, paragraph 5.B.(6)(g), of
CFM SB LEAP-1B-72-00-0222-01A-930A-D, Issue 007, dated May 17, 2019,
then you must continue the repetitive inspections required by
paragraphs (g)(1)(i)(B) or (g)(1)(ii)(B) of this AD.
(2) [Reserved]
(j) Definition
For the purpose of this AD, ``flight hours (FHs) since new'' are
the FHs accumulated on the RDS bearings on new engines delivered
from production and on engines that have had the RDS bearing
replaced during an engine shop visit.
(k) No Reporting Requirement
The reporting requirement in paragraph 5.A.(6) in CFM SB LEAP-
1B-72-00-0222-01A-930A-D, Issue 007, dated May 17, 2019, is not
required by this AD.
(l) Credit for Previous Actions
You may take credit for the inspections that are required by
paragraph (g)(1) of this AD, if you performed those actions before
the effective date of this AD using CFM SB LEAP-1B-72-00-0222-01A-
930A-D, Issue 006, dated March 22, 2019, or an earlier revision. You
may also take credit for the optional BSI in paragraphs (h)(1) or
the optional terminating inspection in paragraph (i)(1) of this AD,
if you performed that action before the effective date of this AD
using CFM SB LEAP-1B-72-00-0256-01A-930A-D, Issue 002, dated May 6,
2019, or an earlier revision.
(m) 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 (n) 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.
(n) Related Information
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].
(o) 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) CFM Service Bulletin LEAP-1B-72-00-0222-01A-930A-D, Issue
007, dated May 17, 2019.
(ii) [Reserved]
(3) For CFM service information identified in this AD, 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].
(4) You may view this service information at 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.
(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, call 202-741-6030, or go to: http://www.archives.gov/federal-register/cfr/ibr-locations.html.
Issued in Burlington, Massachusetts, on June 14, 2019.
Karen M. Grant,
Acting Manager, Engine & Propeller Standards Branch, Aircraft
Certification Service.
[FR Doc. 2019-13022 Filed 6-17-19; 8:45 am]
BILLING CODE 4910-13-P
