Airworthiness Directives; CFM International S.A. Turbofan Engines, 32447-32450 [2017-14545]
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32447
Rules and Regulations
Federal Register
Vol. 82, No. 134
Friday, July 14, 2017
This section of the FEDERAL REGISTER
contains regulatory documents having general
applicability and legal effect, most of which
are keyed to and codified in the Code of
Federal Regulations, which is published under
50 titles pursuant to 44 U.S.C. 1510.
The Code of Federal Regulations is sold by
the Superintendent of Documents.
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA–2016–9592; Directorate
Identifier 2016–NE–30–AD; Amendment 39–
18952; AD 2017–14–08]
RIN 2120–AA64
OFFICE OF SPECIAL COUNSEL
Airworthiness Directives; CFM
International S.A. Turbofan Engines
5 CFR Part 1800
Federal Aviation
Administration (FAA), DOT.
ACTION: Final rule.
AGENCY:
[OMB Control No. 3255–0005]
Filing of Complaints of Prohibited
Personnel Practices or Other
Prohibited Activities and Filing
Disclosures of Information
AGENCY:
ACTION:
Final rule; delay of effective
date.
This document delays the
effective date of the final rule and
information collection activity
published in the June 9, 2017 issue of
the Federal Register. The U.S. Office of
Special Counsel (OSC) will issue a new
effective date in due course.
SUMMARY:
As of July 14, 2017, the effective
date of the final rule published at 82 FR
26739 on June 9, 2017, is delayed
indefinitely.
DATES:
FOR FURTHER INFORMATION CONTACT:
Susan K. Ullman, General Counsel, U.S.
Office of Special Counsel, by telephone
at 202–254–3600, by facsimile at (202)
254–3711, or by email at sullman@
osc.gov.
On June 9,
2017 (82 FR 26739), OSC published a
final rule revising its regulations
regarding the filing of complaints and
disclosures with OSC and updating
OSC’s prohibited personnel practice
provisions. This document indefinitely
delays the effective date of that final
rule.
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SUPPLEMENTARY INFORMATION:
Dated: July 11, 2017.
Bruce Gipe,
Chief Operating Officer.
[FR Doc. 2017–14814 Filed 7–13–17; 8:45 am]
BILLING CODE 7405–01–P
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Examining the AD Docket
You may examine the AD docket on
the Internet at https://
www.regulations.gov by searching for
and locating Docket No. FAA–2016–
9592; or in person at the Docket
Management Facility 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 address for the
Docket Office (phone: 800–647–5527) is
Frm 00001
Fmt 4700
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David Bethka, Aerospace Engineer,
Engine Certification Office, FAA, Engine
& Propeller Directorate, 1200 District
Avenue, Burlington, MA 01803; phone:
781–238–7129; fax: 781–238–7199;
email: david.bethka@faa.gov.
Discussion
We are adopting a new
airworthiness directive (AD) for certain
CFM International S.A. (CFM) CFM56–
3, –3B, and –3C turbofan engines. This
AD was prompted by a report of dualengine loss of thrust control (LOTC) that
resulted in an air turn back. This AD
requires initial and repetitive checks of
the variable stator vane (VSV) actuation
system in the high-pressure compressor
(HPC). We are issuing this AD to
address the unsafe condition on these
products.
DATES: This AD is effective August 18,
2017.
ADDRESSES: 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:
aviation.fleetsupport@ge.com. You may
view this service information at the
FAA, Engine & Propeller Directorate,
1200 District Avenue, Burlington, MA.
For information on the availability of
this material at the FAA, call 781–238–
7125. It is also available on the Internet
at https://www.regulations.gov by
searching for and locating Docket No.
FAA–2016–9592.
PO 00000
FOR FURTHER INFORMATION CONTACT:
SUPPLEMENTARY INFORMATION:
SUMMARY:
U.S. Office of Special Counsel.
Document Management Facility, U.S.
Department of Transportation, Docket
Operations, M–30, West Building
Ground Floor, Room W12–140, 1200
New Jersey Avenue SE., Washington,
DC 20590.
We issued a notice of proposed
rulemaking (NPRM) to amend 14 CFR
part 39 by adding an AD that would
apply to certain CFM CFM56–3, –3B,
and –3C turbofan engines. The NPRM
published in the Federal Register on
March 9, 2017 (82 FR 13077). The
NPRM was prompted by a report of
dual-engine LOTC that resulted in an air
turn back. The NPRM proposed to
require initial and repetitive checks of
the VSV actuation system in the HPC.
We are issuing this AD to maintain the
actuators ability to fully reach
commanded position, and prevent
LOTC and reduced control of the
airplane.
Comments
We gave the public the opportunity to
participate in developing this final rule.
The following presents the comments
received on the NPRM and the FAA’s
response to each comment.
Request To Change Applicability
CFM, Boeing, Anonymous, and
Jet2.com requested that the
Applicability paragraph be limited to
engines operating in the tropical regions
specified in CFM Service Bulletin (SB)
CFM56–3 S/B 72–1169, rather than
fleet-wide. A change of applicability to
specific regions would avoid
unnecessary burden for operators that
do not fly in tropical zones and do not
fly less than 150 hours per month.
We disagree. Operators may
experience high moisture environments
outside of the specified tropical zone
that is described in CFM SB CFM56–3
S/B 72–1169. Operators that are outside
of the specified tropical zone have
experienced restricted VSV movement
events. We did not change this AD.
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Federal Register / Vol. 82, No. 134 / Friday, July 14, 2017 / Rules and Regulations
references CFM SB CFM56–3 S/B 72–
1169, Revision 01, dated November 4,
2016.
Request To Change Compliance
Milan Pavlovic requested that we
allow the replacement of an affected
stator case with an HPC stator case (that
passes the pull force check) in lieu of a
repaired case. The proposed
Compliance paragraph (f)(2)(i) states: ‘‘If
any stage requires more than 100 lbs.
force to move the actuation ring, ream
the VSV bores and apply anti-corrosion
coating to stage 1, 2 and 3, prior to
further flight.’’ This statement is
interpreted as incorporation of CFM
CFM56–3 ESM 72–32–01, Repair 031 is
the mandated action and therefore the
only acceptable action to satisfy the AD
compliance requirements. Would
replacement of the stator case assembly
with a serviceable stator case assembly,
that has not had CFM CFM56–3 ESM
72–32–01, Repair 031 performed, be
considered an acceptable alternate
action providing the pull force check is
performed on the replacement stator
case assembly and is found to be less
than 75 lbs. in each stage?
The commenter feels that replacement
with a stator case that passes the pull
force check is an additional action that
would satisfy the AD requirements. The
replacement case would be subject to
the repetitive checks specified in
paragraph (f)(3).
We partially agree. We disagree that
using any specific service information to
comply this AD is mandated. We agree
that the installation of a replacement
HPC stator case that passes the VSV pull
force check with measurements of 75
lbs. or less is acceptable. We changed
paragraph (f)(2)(i) of this AD
accordingly.
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Request To Change Service Information
Milan Pavlovic requested that we
include the CFM CFM56–3 Engine Shop
Manual (ESM) 72–32–00 procedure for
VSV pull force checks, as an acceptable
method of compliance, in paragraph
(f)(2) of this AD. The change is
requested to allow the pull force check
at the modular level, using the ESM
procedure.
We partially agree. We agree that
performing the pull force check of the
VSV system per the ESM is acceptable.
We disagree with including a statement
in paragraph (f)(2) because paragraph
(f)(2) does not refer to any service
information.
Request To Change Applicability
CFM and Milan Pavlovic noted that
early configurations of the CFM56–3
engines were released with titanium
HPC stator cases, which are not
susceptible to corrosion in VSV bores.
An additional commenter asks if the AD
should affect steel stator cases only.
CFM recommends applicability be
noted as CFM56–3 engines with steel
HPC cases with P/Ns 1499M30G01,
1499M30G02, 1499M30G03, or
1676M88G01. CFM’s experience
indicates that the titanium HPC cases do
not experience VSV bore corrosion, and
therefore do not experience restricted
VSV movement due to bore corrosion.
We agree. Titanium HPC cases do not
experience restricted VSV movement
due to VSV bore corrosion. We changed
this AD to specify that it is applicable
to CFM56–3, –3B, and –3C turbofan
engines with steel HPC stator cases,
P/Ns 1499M30G01, 1499M30G02,
1499M30G03, or 1676M88G01,
installed.
Request To Change Service Information
Date
CFM requested that we cite the latest
revision date of CFM SB CFM56–3 S/B
72–1169, in the Service Information
section.
We agree. The NPRM included an
earlier revision date. This AD now
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Request To Change Service Information
Date
CFM requested that we refer to the
latest revision of CFM CFM56–3 ESM
72–32–01, Repair 031, in the Service
Information section. The latest CFM
CFM56–3 ESM 72–32–01, Repair 031,
revision is dated December 15, 2016.
We agree. The NPRM referenced an
out of date ESM repair. This AD now
references CFM CFM56–3 ESM 72–32–
01, Repair 031, dated December 15,
2016.
Request To Change the Unsafe
Condition Paragraph
CFM proposes that we change the
language in the Discussion section to
state that the VSV resistance due to the
corrosion may lead to an inability of the
actuator to fully reach commanded
position. The description should more
accurately describe the problem. VSV
actuators do not fail due to corrosion,
but do exhibit limited range of
movement.
We agree. The statement of ‘‘failure of
VSV actuators’’ is an incomplete
description of the problem. We revised
the Discussion section and paragraph (e)
of this AD to clarify.
Request To Change Related Service
Information
CFM requested that we change the
Related Service Information section,
which highlights that CFM SB CFM56–
3 S/B 72–1169, Revision 01, dated
PO 00000
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Fmt 4700
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November 4, 2016, describes a
procedure to examine the VSV bore on
the inside of the HPC case. While this
is correct, CFM proposes that this
section highlight that CFM SB CFM56–
3 S/B 72–1169 describes a procedure to
check the resistance of the VSV system
as this portion of the SB is most
relevant.
We agree. This AD requires a pull
force check of VSV actuators. We
changed the Related Service Information
section to state that CFM SB CFM56–3
S/B 72–1169, Revision 01, dated
November 4, 2016 describes a procedure
to check the resistance of the VSV
system.
Request To Allow Special Flight
Permits
Boeing recommends allowing a ferry
flight instead of requiring repair prior to
further flight, if a pull force check
exceeds 100 lb on one engine. They
stated that a ferry flight should be
allowed if take-off rated thrust can be
achieved during a ground run, and the
sister engine is within SB VSV pull
force limits.
We partially agree. We agree with
allowing special flight permits because
a dual engine LOTC due to VSV
restricted movement is unlikely to occur
if the sister engine is within the pull
force limit. We disagree with changing
this AD, because as written, this AD
does not limit or prohibit special flight
permits. Special flight permits are
allowed under 14 CFR 39.23. We did
not change this AD.
Request To Change Applicability
A commenter asked why the Bahrain
region is not listed as an affected zone
for applicability of CFM SB CFM56–3
S/B 72–1169, Revision 01, dated
November 4, 2016. The commenter
stated that regions other than tropical
climate zones listed in the SB may also
expose an engine to humid
environments.
We agree. We recognize that operation
in more than one climate zone may
contribute to VSV bore corrosion.
However, this AD is applicable to all
CFM56–3, –3B, and –3C turbofan
engines with a steel HPC stator case,
part numbers (P/Ns) 1499M30G01,
1499M30G02, 1499M30G03, or
1676M88G01, installed, regardless of
their operating environment. We did not
change this AD.
Support for the NPRM
The Air Line Pilots Association
expressed support for the NPRM as
written.
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Conclusion
We reviewed the relevant data,
considered the comments received, and
determined that air safety and the
public interest require adopting this
final rule with the changes described
previously. We have determined that
these minor changes:
• Are consistent with the intent that
was proposed in the NPRM for
correcting the unsafe condition; and
• Do not add any additional burden
upon the public than was already
proposed in the NPRM.
We also determined that these
changes will not increase the economic
burden on any operator or increase the
scope of this final rule.
system. We also reviewed CFM CFM56–
3 ESM 72–32–01, Repair 031, dated
December 15, 2016. This ESM repair
describes procedures for reaming and
applying anti-corrosion paint to the VSV
bores.
Related Service Information
We estimate that this AD affects 460
engines installed on airplanes of U.S.
registry.
We estimate the following costs to
comply with this AD:
We reviewed CFM SB CFM56–3 S/B
72–1169, Revision 01, dated November
4, 2016. This SB describes a procedure
to check the resistance of the VSV
Costs of Compliance
ESTIMATED COSTS
Action
Labor cost
Inspection of the HPC VSV actuation system ....
2 work-hours × $85 per hour = $170 ................
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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.
We are 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) Is not a ‘‘significant rule’’ under
DOT Regulatory Policies and Procedures
(44 FR 11034, February 26, 1979),
(3) Will not affect intrastate aviation
in Alaska to the extent that it justifies
making a regulatory distinction, and
(4) Will not have a significant
economic impact, positive or negative,
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Parts cost
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.
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
1. The authority citation for part 39
continues to read as follows:
■
Authority: 49 U.S.C. 106(g), 40113, 44701.
§ 39.13
[Amended]
2. The FAA amends § 39.13 by adding
the following new airworthiness
directive (AD):
■
2017–14–08 CFM International S.A.:
Amendment 39–18952; Docket No.
FAA–2016–9592; Directorate Identifier
2016–NE–30–AD.
(a) Effective Date
This AD is effective August 18, 2017.
(b) Affected ADs
None.
(c) Applicability
This AD applies to CFM International S.A.
(CFM) CFM56–3, –3B, and –3C turbofan
engines with steel high-pressure compressor
(HPC) stator case, part numbers (P/
Ns)1499M30G01, 1499M30G02,
1499M30G03, or 1676M88G01, installed.
(d) Subject
Joint Aircraft System Component (JASC)
Code 7230, Turbine Engine Compressor
Section.
PO 00000
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Cost per
product
$0
Cost on U.S.
operators
$170
$78,200
(e) Unsafe Condition
This AD was prompted by a report of dual
engine loss of thrust control (LOTC) that
resulted in an air turn back. We are issuing
this AD to maintain the actuators ability to
fully reach commanded position, and prevent
LOTC and reduced control of the airplane.
(f) Compliance
Comply with this AD within the
compliance times specified, unless already
done. Within 12 months after the effective
date of this AD:
(1) Inspect the affected engines to
determine if the compressor front stator case
is marked with ‘‘RP031’’ adjacent to the part
number. If the case is marked with ‘‘RP031,’’
no further action is required. If the case is not
marked with ‘‘RP031,’’ follow the remaining
steps in paragraph (f) of this AD.
(2) Perform an initial pull force check of
stage 1, stage 2, and stage 3 of the compressor
variable stator vane (VSV) actuation system.
(i) If any stage requires more than 100 lb
force to move the actuation ring, ream the
VSV bores and apply anti-corrosion coating
to stages 1, 2, and 3, prior to further flight,
or replace with an HPC stator case that is
eligible for installation and passes the VSV
pull force check with measurements of 75 lb
or less.
(ii) If any stage requires more than 75 lb,
but less than or equal to 100 lb force to move
the actuation ring, repeat the inspection
within 3 months since last inspection.
(iii) If all stages require 75 lb force or less
to move the actuation rings, repeat the
inspection within 12 months since last
inspection.
(3) Thereafter, continue to perform
repetitive pull force checks of stages 1, 2, and
3 of the compressor VSV actuation system
and disposition as specified in paragraphs
(2)(i) through (iii) of this AD.
(g) Optional Terminating Action
Reaming the VSV bores and applying anticorrosion coating, as specified in paragraph
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Federal Register / Vol. 82, No. 134 / Friday, July 14, 2017 / Rules and Regulations
(f)(2)(i) of this AD, is terminating action to
the repetitive inspections required by
paragraph (f)(3) of this AD.
(h) Alternative Methods of Compliance
(AMOCs)
The Manager, Engine Certification Office,
FAA, may approve AMOCs for this AD. Use
the procedures found in 14 CFR 39.19 to
make your request. You may email your
request to: ANE-AD-AMOC@faa.gov.
(i) Related Information
(1) For more information about this AD,
contact David Bethka, Aerospace Engineer,
Engine Certification Office, FAA, Engine &
Propeller Directorate, 1200 District Avenue,
Burlington, MA 01803; phone: 781–238–
7129; fax: 781–238–7199; email:
david.bethka@faa.gov.
(2) CFM Service Bulletin CFM56–3 S/B 72–
1169, Revision 01, dated November 4, 2016;
and CFM CFM56–3 Engine Shop Manual 72–
32–01, Repair 031, dated December 15, 2016,
can be obtained from CFM using the contact
information in paragraph (i)(3) of this
proposed AD.
(3) For 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: aviation.fleetsupport@ge.com.
(4) You may view this service information
at the FAA, Engine & Propeller Directorate,
1200 District Avenue, Burlington, MA. For
information on the availability of this
material at the FAA, call 781–238–7125.
Issued in Burlington, Massachusetts, on
July 6, 2017.
Robert J. Ganley,
Acting Manager, Engine & Propeller
Directorate, Aircraft Certification Service.
[FR Doc. 2017–14545 Filed 7–13–17; 8:45 am]
BILLING CODE 4910–13–P
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 71
[Docket No. FAA–2016–9544; Airspace
Docket No. 16–ASW–22]
Amendment of Class D and E Airspace
for the Following Texas Towns;
Sherman, TX; and Temple, TX, and
Establishment of Class E Airspace,
Temple, TX
Federal Aviation
Administration (FAA), DOT.
ACTION: Final rule.
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AGENCY:
This action: Amends Class D
airspace at North Texas Regional
Airport/Perrin Field, Sherman, TX;
amends Class E airspace designated as
a surface area at Draughon-Miller
Central Texas Regional Airport, Temple,
TX; amends Class E airspace extending
upward from 700 feet above the surface
SUMMARY:
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at North Texas Regional Airport/Perrin
Field, and Draughon-Miller Central
Texas Regional Airport; and establishes
Class E airspace designated as an
extension at Draughon-Miller Central
Texas Regional Airport. Cancellation of
standard instrument approach
procedures at these airports has made
this action necessary for the safety and
management of Instrument Flight Rules
(IFR) operations at these airports.
Additionally, geographic coordinates,
names of airports, and a navigation aid
are being adjusted to coincide with the
FAA’s aeronautical database.
DATES: Effective 0901 UTC, October 12,
2017. The Director of the Federal
Register approves this incorporation by
reference action under Title 1, Code of
Federal Regulations, part 51, subject to
the annual revision of FAA Order
7400.11 and publication of conforming
amendments.
ADDRESSES: FAA Order 7400.11A,
Airspace Designations and Reporting
Points, and subsequent amendments can
be viewed online at https://www.faa.gov/
air_traffic/publications/. For further
information, you can contact the
Airspace Policy Group, Federal Aviation
Administration, 800 Independence
Avenue SW., Washington, DC 20591;
telephone: (202) 267–8783. The Order is
also available for inspection at the
National Archives and Records
Administration (NARA). For
information on the availability of FAA
Order 7400.11A at NARA, call (202)
741–6030, or go to https://
www.archives.gov/federal_register/
code_of_federal-regulations/ibr_
locations.html.
FAA Order 7400.11, Airspace
Designations and Reporting Points, is
published yearly and effective on
September 15.
FOR FURTHER INFORMATION CONTACT:
Jeffrey Claypool, Federal Aviation
Administration, Operations Support
Group, Central Service Center, 10101
Hillwood Parkway, Fort Worth, TX
76177; telephone (817) 222–5711.
SUPPLEMENTARY INFORMATION:
of airspace necessary to ensure the
safety of aircraft and the efficient use of
airspace. This regulation is within the
scope of that authority as it amends
Class D airspace at North Texas
Regional Airport/Perrin Field, Sherman,
TX; Class E airspace designated as a
surface area at Draughon-Miller Central
Texas Regional Airport, Temple, TX;
Class E airspace extending upward from
700 feet above the surface at North
Texas Regional Airport/Perrin Field and
Draughon-Miller Central Texas Regional
Airport; and establishes Class E airspace
designated as an extension at DraughonMiller Central Texas Regional Airport,
in support IFR operations at these
airports.
Authority for This Rulemaking
The FAA’s authority to issue rules
regarding aviation safety is found in
Title 49 of the United States Code.
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. This rulemaking is
promulgated under the authority
described in Subtitle VII, Part A,
Subpart I, Section 40103. Under that
section, the FAA is charged with
prescribing regulations to assign the use
Availability and Summary of
Documents for Incorporation by
Reference
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History
On April 20, 2017, the FAA published
in the Federal Register (82 FR 18596)
Docket No. FAA–2016–9544, a notice of
proposed rulemaking (NPRM) to amend
Class D airspace at North Texas
Regional Airport/Perrin Field, Sherman,
TX; amend Class E airspace designated
as a surface area at Draughon-Miller
Central Texas Regional Airport, Temple,
TX; amend Class E airspace extending
upward from 700 feet above the surface
at North Texas Regional Airport/Perrin
Field and Draughon-Miller Central
Texas Regional Airport; and establish
Class E airspace designated as an
extension at Draughon-Miller Central
Texas Regional Airport. Interested
parties were invited to participate in
this rulemaking effort by submitting
written comments on the proposal to the
FAA. No comments were received.
Class D and E airspace designations
are published in paragraph 5000, 6002,
6004, and 6005, respectively, of FAA
Order 7400.11A, dated August 3, 2016,
and effective September 15, 2016, which
is incorporated by reference in 14 CFR
71.1. The Class D and E airspace
designations listed in this document
will be published subsequently in the
Order.
This document amends FAA Order
7400.11A, Airspace Designations and
Reporting Points, dated August 3, 2016,
and effective September 15, 2016. FAA
Order 7400.11A is publicly available as
listed in the ADDRESSES section of this
document. FAA Order 7400.11A lists
Class A, B, C, D, and E airspace areas,
air traffic service routes, and reporting
points.
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Agencies
[Federal Register Volume 82, Number 134 (Friday, July 14, 2017)]
[Rules and Regulations]
[Pages 32447-32450]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2017-14545]
=======================================================================
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2016-9592; Directorate Identifier 2016-NE-30-AD;
Amendment 39-18952; AD 2017-14-08]
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: We are adopting a new airworthiness directive (AD) for certain
CFM International S.A. (CFM) CFM56-3, -3B, and -3C turbofan engines.
This AD was prompted by a report of dual-engine loss of thrust control
(LOTC) that resulted in an air turn back. This AD requires initial and
repetitive checks of the variable stator vane (VSV) actuation system in
the high-pressure compressor (HPC). We are issuing this AD to address
the unsafe condition on these products.
DATES: This AD is effective August 18, 2017.
ADDRESSES: 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: aviation.fleetsupport@ge.com. You may view this
service information at the FAA, Engine & Propeller Directorate, 1200
District Avenue, Burlington, MA. For information on the availability of
this material at the FAA, call 781-238-7125. It is also available on
the Internet at https://www.regulations.gov by searching for and
locating Docket No. FAA-2016-9592.
Examining the AD Docket
You may examine the AD docket on the Internet at https://www.regulations.gov by searching for and locating Docket No. FAA-2016-
9592; or in person at the Docket Management Facility 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 address for the Docket Office
(phone: 800-647-5527) is Document Management Facility, 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: David Bethka, Aerospace Engineer,
Engine Certification Office, FAA, Engine & Propeller Directorate, 1200
District Avenue, Burlington, MA 01803; phone: 781-238-7129; fax: 781-
238-7199; email: david.bethka@faa.gov.
SUPPLEMENTARY INFORMATION:
Discussion
We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR
part 39 by adding an AD that would apply to certain CFM CFM56-3, -3B,
and -3C turbofan engines. The NPRM published in the Federal Register on
March 9, 2017 (82 FR 13077). The NPRM was prompted by a report of dual-
engine LOTC that resulted in an air turn back. The NPRM proposed to
require initial and repetitive checks of the VSV actuation system in
the HPC. We are issuing this AD to maintain the actuators ability to
fully reach commanded position, and prevent LOTC and reduced control of
the airplane.
Comments
We gave the public the opportunity to participate in developing
this final rule. The following presents the comments received on the
NPRM and the FAA's response to each comment.
Request To Change Applicability
CFM, Boeing, Anonymous, and Jet2.com requested that the
Applicability paragraph be limited to engines operating in the tropical
regions specified in CFM Service Bulletin (SB) CFM56-3 S/B 72-1169,
rather than fleet-wide. A change of applicability to specific regions
would avoid unnecessary burden for operators that do not fly in
tropical zones and do not fly less than 150 hours per month.
We disagree. Operators may experience high moisture environments
outside of the specified tropical zone that is described in CFM SB
CFM56-3 S/B 72-1169. Operators that are outside of the specified
tropical zone have experienced restricted VSV movement events. We did
not change this AD.
[[Page 32448]]
Request To Change Service Information
Milan Pavlovic requested that we include the CFM CFM56-3 Engine
Shop Manual (ESM) 72-32-00 procedure for VSV pull force checks, as an
acceptable method of compliance, in paragraph (f)(2) of this AD. The
change is requested to allow the pull force check at the modular level,
using the ESM procedure.
We partially agree. We agree that performing the pull force check
of the VSV system per the ESM is acceptable. We disagree with including
a statement in paragraph (f)(2) because paragraph (f)(2) does not refer
to any service information.
Request To Change Compliance
Milan Pavlovic requested that we allow the replacement of an
affected stator case with an HPC stator case (that passes the pull
force check) in lieu of a repaired case. The proposed Compliance
paragraph (f)(2)(i) states: ``If any stage requires more than 100 lbs.
force to move the actuation ring, ream the VSV bores and apply anti-
corrosion coating to stage 1, 2 and 3, prior to further flight.'' This
statement is interpreted as incorporation of CFM CFM56-3 ESM 72-32-01,
Repair 031 is the mandated action and therefore the only acceptable
action to satisfy the AD compliance requirements. Would replacement of
the stator case assembly with a serviceable stator case assembly, that
has not had CFM CFM56-3 ESM 72-32-01, Repair 031 performed, be
considered an acceptable alternate action providing the pull force
check is performed on the replacement stator case assembly and is found
to be less than 75 lbs. in each stage?
The commenter feels that replacement with a stator case that passes
the pull force check is an additional action that would satisfy the AD
requirements. The replacement case would be subject to the repetitive
checks specified in paragraph (f)(3).
We partially agree. We disagree that using any specific service
information to comply this AD is mandated. We agree that the
installation of a replacement HPC stator case that passes the VSV pull
force check with measurements of 75 lbs. or less is acceptable. We
changed paragraph (f)(2)(i) of this AD accordingly.
Request To Change Service Information Date
CFM requested that we cite the latest revision date of CFM SB
CFM56-3 S/B 72-1169, in the Service Information section.
We agree. The NPRM included an earlier revision date. This AD now
references CFM SB CFM56-3 S/B 72-1169, Revision 01, dated November 4,
2016.
Request To Change Service Information Date
CFM requested that we refer to the latest revision of CFM CFM56-3
ESM 72-32-01, Repair 031, in the Service Information section. The
latest CFM CFM56-3 ESM 72-32-01, Repair 031, revision is dated December
15, 2016.
We agree. The NPRM referenced an out of date ESM repair. This AD
now references CFM CFM56-3 ESM 72-32-01, Repair 031, dated December 15,
2016.
Request To Change Applicability
CFM and Milan Pavlovic noted that early configurations of the
CFM56-3 engines were released with titanium HPC stator cases, which are
not susceptible to corrosion in VSV bores. An additional commenter asks
if the AD should affect steel stator cases only. CFM recommends
applicability be noted as CFM56-3 engines with steel HPC cases with P/
Ns 1499M30G01, 1499M30G02, 1499M30G03, or 1676M88G01. CFM's experience
indicates that the titanium HPC cases do not experience VSV bore
corrosion, and therefore do not experience restricted VSV movement due
to bore corrosion.
We agree. Titanium HPC cases do not experience restricted VSV
movement due to VSV bore corrosion. We changed this AD to specify that
it is applicable to CFM56-3, -3B, and -3C turbofan engines with steel
HPC stator cases, P/Ns 1499M30G01, 1499M30G02, 1499M30G03, or
1676M88G01, installed.
Request To Change the Unsafe Condition Paragraph
CFM proposes that we change the language in the Discussion section
to state that the VSV resistance due to the corrosion may lead to an
inability of the actuator to fully reach commanded position. The
description should more accurately describe the problem. VSV actuators
do not fail due to corrosion, but do exhibit limited range of movement.
We agree. The statement of ``failure of VSV actuators'' is an
incomplete description of the problem. We revised the Discussion
section and paragraph (e) of this AD to clarify.
Request To Change Related Service Information
CFM requested that we change the Related Service Information
section, which highlights that CFM SB CFM56-3 S/B 72-1169, Revision 01,
dated November 4, 2016, describes a procedure to examine the VSV bore
on the inside of the HPC case. While this is correct, CFM proposes that
this section highlight that CFM SB CFM56-3 S/B 72-1169 describes a
procedure to check the resistance of the VSV system as this portion of
the SB is most relevant.
We agree. This AD requires a pull force check of VSV actuators. We
changed the Related Service Information section to state that CFM SB
CFM56-3 S/B 72-1169, Revision 01, dated November 4, 2016 describes a
procedure to check the resistance of the VSV system.
Request To Allow Special Flight Permits
Boeing recommends allowing a ferry flight instead of requiring
repair prior to further flight, if a pull force check exceeds 100 lb on
one engine. They stated that a ferry flight should be allowed if take-
off rated thrust can be achieved during a ground run, and the sister
engine is within SB VSV pull force limits.
We partially agree. We agree with allowing special flight permits
because a dual engine LOTC due to VSV restricted movement is unlikely
to occur if the sister engine is within the pull force limit. We
disagree with changing this AD, because as written, this AD does not
limit or prohibit special flight permits. Special flight permits are
allowed under 14 CFR 39.23. We did not change this AD.
Request To Change Applicability
A commenter asked why the Bahrain region is not listed as an
affected zone for applicability of CFM SB CFM56-3 S/B 72-1169, Revision
01, dated November 4, 2016. The commenter stated that regions other
than tropical climate zones listed in the SB may also expose an engine
to humid environments.
We agree. We recognize that operation in more than one climate zone
may contribute to VSV bore corrosion. However, this AD is applicable to
all CFM56-3, -3B, and -3C turbofan engines with a steel HPC stator
case, part numbers (P/Ns) 1499M30G01, 1499M30G02, 1499M30G03, or
1676M88G01, installed, regardless of their operating environment. We
did not change this AD.
Support for the NPRM
The Air Line Pilots Association expressed support for the NPRM as
written.
[[Page 32449]]
Conclusion
We reviewed the relevant data, considered the comments received,
and determined that air safety and the public interest require adopting
this final rule with the changes described previously. We have
determined that these minor changes:
[Agr]re consistent with the intent that was proposed in
the NPRM for correcting the unsafe condition; and
Do not add any additional burden upon the public than was
already proposed in the NPRM.
We also determined that these changes will not increase the
economic burden on any operator or increase the scope of this final
rule.
Related Service Information
We reviewed CFM SB CFM56-3 S/B 72-1169, Revision 01, dated November
4, 2016. This SB describes a procedure to check the resistance of the
VSV system. We also reviewed CFM CFM56-3 ESM 72-32-01, Repair 031,
dated December 15, 2016. This ESM repair describes procedures for
reaming and applying anti-corrosion paint to the VSV bores.
Costs of Compliance
We estimate that this AD affects 460 engines installed on airplanes
of U.S. registry.
We estimate the following costs to comply with this AD:
Estimated Costs
----------------------------------------------------------------------------------------------------------------
Cost per Cost on U.S.
Action Labor cost Parts cost product operators
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Inspection of the HPC VSV actuation 2 work-hours x $85 per hour = $0 $170 $78,200
system. $170.
----------------------------------------------------------------------------------------------------------------
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.
We are 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) Is not a ``significant rule'' under DOT Regulatory Policies and
Procedures (44 FR 11034, February 26, 1979),
(3) Will not affect intrastate aviation in Alaska to the extent
that it justifies making a regulatory distinction, and
(4) 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.
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):
2017-14-08 CFM International S.A.: Amendment 39-18952; Docket No.
FAA-2016-9592; Directorate Identifier 2016-NE-30-AD.
(a) Effective Date
This AD is effective August 18, 2017.
(b) Affected ADs
None.
(c) Applicability
This AD applies to CFM International S.A. (CFM) CFM56-3, -3B,
and -3C turbofan engines with steel high-pressure compressor (HPC)
stator case, part numbers (P/Ns)1499M30G01, 1499M30G02, 1499M30G03,
or 1676M88G01, installed.
(d) Subject
Joint Aircraft System Component (JASC) Code 7230, Turbine Engine
Compressor Section.
(e) Unsafe Condition
This AD was prompted by a report of dual engine loss of thrust
control (LOTC) that resulted in an air turn back. We are issuing
this AD to maintain the actuators ability to fully reach commanded
position, and prevent LOTC and reduced control of the airplane.
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done. Within 12 months after the effective date of
this AD:
(1) Inspect the affected engines to determine if the compressor
front stator case is marked with ``RP031'' adjacent to the part
number. If the case is marked with ``RP031,'' no further action is
required. If the case is not marked with ``RP031,'' follow the
remaining steps in paragraph (f) of this AD.
(2) Perform an initial pull force check of stage 1, stage 2, and
stage 3 of the compressor variable stator vane (VSV) actuation
system.
(i) If any stage requires more than 100 lb force to move the
actuation ring, ream the VSV bores and apply anti-corrosion coating
to stages 1, 2, and 3, prior to further flight, or replace with an
HPC stator case that is eligible for installation and passes the VSV
pull force check with measurements of 75 lb or less.
(ii) If any stage requires more than 75 lb, but less than or
equal to 100 lb force to move the actuation ring, repeat the
inspection within 3 months since last inspection.
(iii) If all stages require 75 lb force or less to move the
actuation rings, repeat the inspection within 12 months since last
inspection.
(3) Thereafter, continue to perform repetitive pull force checks
of stages 1, 2, and 3 of the compressor VSV actuation system and
disposition as specified in paragraphs (2)(i) through (iii) of this
AD.
(g) Optional Terminating Action
Reaming the VSV bores and applying anti-corrosion coating, as
specified in paragraph
[[Page 32450]]
(f)(2)(i) of this AD, is terminating action to the repetitive
inspections required by paragraph (f)(3) of this AD.
(h) Alternative Methods of Compliance (AMOCs)
The Manager, Engine Certification Office, FAA, may approve AMOCs
for this AD. Use the procedures found in 14 CFR 39.19 to make your
request. You may email your request to: ANE-AD-AMOC@faa.gov.
(i) Related Information
(1) For more information about this AD, contact David Bethka,
Aerospace Engineer, Engine Certification Office, FAA, Engine &
Propeller Directorate, 1200 District Avenue, Burlington, MA 01803;
phone: 781-238-7129; fax: 781-238-7199; email: david.bethka@faa.gov.
(2) CFM Service Bulletin CFM56-3 S/B 72-1169, Revision 01, dated
November 4, 2016; and CFM CFM56-3 Engine Shop Manual 72-32-01,
Repair 031, dated December 15, 2016, can be obtained from CFM using
the contact information in paragraph (i)(3) of this proposed AD.
(3) For 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: aviation.fleetsupport@ge.com.
(4) You may view this service information at the FAA, Engine &
Propeller Directorate, 1200 District Avenue, Burlington, MA. For
information on the availability of this material at the FAA, call
781-238-7125.
Issued in Burlington, Massachusetts, on July 6, 2017.
Robert J. Ganley,
Acting Manager, Engine & Propeller Directorate, Aircraft Certification
Service.
[FR Doc. 2017-14545 Filed 7-13-17; 8:45 am]
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