Rule2023-08624
Airworthiness Directives; Pratt & Whitney Canada Corporation 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
April 25, 2023
Effective
May 30, 2023
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA is adopting a new airworthiness directive (AD) for certain Pratt & Whitney Canada Corporation (P&WC) PW308A and PW308C model turbofan engines. This AD is prompted by a manufacturer's design review, which identified that the combustion chamber outer case (CCOC) to rear compressor case (RCC) flange bolt low cycle fatigue life was inadequate and that those flange bolts may develop cracks resulting in flange bolt fracture. This AD requires replacing all CCOC flange bolts and modifying the CCOC and inner bypass ducts. This AD also prohibits installation of certain flange bolts on any affected engine, as specified in a Transport Canada AD, which is proposed for incorporation by reference (IBR). The FAA is issuing this AD to address the unsafe condition on these products.
Full Text
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<title>Federal Register, Volume 88 Issue 79 (Tuesday, April 25, 2023)</title>
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[Federal Register Volume 88, Number 79 (Tuesday, April 25, 2023)]
[Rules and Regulations]
[Pages 24897-24899]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2023-08624]
========================================================================
Rules and Regulations
Federal Register
________________________________________________________________________
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.
========================================================================
Federal Register / Vol. 88, No. 79 / Tuesday, April 25, 2023 / Rules
and Regulations
[[Page 24897]]
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2023-0022; Project Identifier MCAI-2022-00564-E;
Amendment 39-22400; AD 2023-06-14]
RIN 2120-AA64
Airworthiness Directives; Pratt & Whitney Canada Corporation
Turbofan Engines
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule.
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SUMMARY: The FAA is adopting a new airworthiness directive (AD) for
certain Pratt & Whitney Canada Corporation (P&WC) PW308A and PW308C
model turbofan engines. This AD is prompted by a manufacturer's design
review, which identified that the combustion chamber outer case (CCOC)
to rear compressor case (RCC) flange bolt low cycle fatigue life was
inadequate and that those flange bolts may develop cracks resulting in
flange bolt fracture. This AD requires replacing all CCOC flange bolts
and modifying the CCOC and inner bypass ducts. This AD also prohibits
installation of certain flange bolts on any affected engine, as
specified in a Transport Canada AD, which is proposed for incorporation
by reference (IBR). The FAA is issuing this AD to address the unsafe
condition on these products.
DATES: This AD is effective May 30, 2023.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of May 30,
2023.
ADDRESSES:
AD Docket: You may examine the AD docket at <a href="http://regulations.gov">regulations.gov</a> under
Docket No. FAA-2023-0022; 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 mandatory continuing airworthiness
information (MCAI), 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.
Material Incorporated by Reference:
<bullet> For service information identified in this final rule,
contact Transport Canada, Transport Canada National Aircraft
Certification, 159 Cleopatra Drive, Nepean, Ontario K1A 0N5, Canada;
phone: (888) 663-3639; email: <a href="/cdn-cgi/l/email-protection#d88c9bf699b1aaafb7aaacb0b1b6bdabab9cb1aabdbbacb1aebdabf59bb7b6abb1bfb6bdabbcbdb6b9aeb1bfb9bab1b4b1acbdf68c9b98acbbf6bfbbf6bbb9"><span class="__cf_email__" data-cfemail="7d293e533c140f0a120f09151413180e0e39140f181e09140b180e503e12130e141a13180e1918131c0b141a1c1f141114091853293e3d091e531a1e531e1c">[email protected]</span></a>. You may find this material on the
Transport Canada website at tc.canada.ca/en/aviation.
<bullet> 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="http://regulations.gov">regulations.gov</a> under Docket No. FAA-2023-0022.
FOR FURTHER INFORMATION CONTACT: Barbara Caufield, Aviation Safety
Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803;
phone: (781) 238-7146; email: <a href="/cdn-cgi/l/email-protection#b3d1d2c1d1d2c1d29dd0d2c6d5dad6dfd7f3d5d2d29dd4dcc5"><span class="__cf_email__" data-cfemail="c7a5a6b5a5a6b5a6e9a4a6b2a1aea2aba387a1a6a6e9a0a8b1">[email protected]</span></a>.
SUPPLEMENTARY INFORMATION:
Background
The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 by adding an AD that would apply to P&WC PW308A model
turbofan engines with build specification (BS) BS935 and BS1249, serial
numbers PCE-CE0180 and prior, and PW308C model turbofan engines with
BS1047 and BS1238, serial numbers PCE-CF0967 and prior. The NPRM
published in the Federal Register on January 24, 2023 (88 FR 4111). The
NPRM was prompted by Transport Canada AD CF-2022-22, dated April 25,
2022 (Transport Canada AD CF-2022-22), issued by Transport Canada,
which is the aviation authority for Canada (referred to after this as
the MCAI). The MCAI states that during a design review, the
manufacturer identified that the existing low cycle fatigue life of the
flange bolts that secure the CCOC and the RCC is inadequate. As of May
6, 2022 (the effective date of Transport Canada AD CF-2022-22), there
have been no reports of cracked flange bolts, however the MCAI states
there is potential that cracks could develop on the flange bolt, which
could lead to fracture of the bolt. The MCAI also states that to
address the potential cracking issue, P&WC introduced redesigned flange
bolts made of an improved fatigue resistant material. P&WC also
introduced revised procedures to modify the CCOC and the inner bypass
duct flange with chamfers to reverse the installation direction of the
flange bolts. The MCAI specifies installation of the redesigned bolt
configuration, modifications to the CCOC and inner bypass duct, and
specifies an installation prohibition for flange bolts with part
numbers MS9698-08 or MS9698-09 on the affected engines.
In the NPRM, the FAA proposed to require replacing all CCOC flange
bolts and modifying the CCOC and inner bypass ducts. The NPRM also
proposed to prohibit installation of flange bolts with part numbers
MS9698-08 and MS9698-09 on any affected engine, as specified in
Transport Canada AD CF-2022-22. The FAA is issuing this AD to address
the unsafe condition on these products.
You may examine the MCAI in the AD docket at <a href="http://regulations.gov">regulations.gov</a> under
Docket No. FAA-2023-0022.
Discussion of Final Airworthiness Directive
Comments
The FAA received one anonymous comment that supported the NPRM
without change.
Conclusion
These products have been approved by the aviation authority of
another country and are approved for operation in the United States.
Pursuant to the FAA's bilateral agreement with this State of Design
Authority, it has notified the FAA of the unsafe condition described in
the MCAI referenced above. The FAA reviewed the relevant data,
considered the comment received, and determined that air safety
requires adopting this AD as proposed. Accordingly, the FAA is issuing
this AD to address the unsafe condition on these products. Except for
minor editorial
[[Page 24898]]
changes, this AD is adopted as proposed in the NPRM.
Related Service Information Under 1 CFR Part 51
The FAA reviewed Transport Canada AD CF-2022-22, which specifies
instructions for replacing certain CCOC flange bolts and modifying the
CCOC and inner bypass ducts. Transport Canada AD CF-2022-22 also
specifies an installation prohibition for flange bolts with part
numbers MS9698-08 and MS9698-09 on the affected 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.
Costs of Compliance
The FAA estimates that this AD affects 668 engines installed on
airplanes of U.S. registry.
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
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Remove and replace all CCOC flange 1.5 work-hours x $85 per $7,742 $7,870 $5,257,160
bolts. hour = $128.
Modify the CCOC and inner bypass ducts 1.5 work-hours x $85 per 0 128 85,504
hour = $128.
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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
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 adding the following new airworthiness
directive:
2023-06-14 Pratt & Whitney Canada Corporation: Amendment 39-22400;
Docket No. FAA-2023-0022; Project Identifier MCAI-2022-00564-E.
(a) Effective Date
This airworthiness directive (AD) is effective May 30, 2023.
(b) Affected ADs
None.
(c) Applicability
This AD applies to:
(1) Pratt & Whitney Canada Corporation (P&WC) PW308A model
turbofan engines with build specification (BS) BS935 and BS1249,
serial numbers PCE-CE0180 and prior; and
(2) P&WC PW308C model turbofan engines with BS1047 and BS1238,
serial numbers PCE-CF0967 and prior.
(d) Subject
Joint Aircraft Service Component (JASC) Code 7240, Turbine
Engine Combustion Section.
(e) Unsafe Condition
This AD was prompted by a manufacturer's design review which
identified that the combustion chamber outer case to rear compressor
case flange bolts low cycle fatigue life was inadequate, and that
those flange bolts may develop cracks resulting in flange bolt
fracture. The FAA is issuing this AD to prevent cracking and
fracture of the flange bolts. The unsafe condition, if not
addressed, may result in flange bolt fracture, flange separation or
case rupture, 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
Except as specified in paragraphs (h) and (i) of this AD:
Perform all required actions within the compliance times specified
in, and in accordance with, Transport Canada AD CF-2022-22.
(h) Exceptions to Transport Canada AD CF-2022-22
Where Transport Canada AD CF-2022-22 requires compliance from
its effective date, this AD requires using the effective date of
this AD.
(i) No Reporting Requirement
Although the service information referenced in Transport Canada
AD CF-2022-22 specifies to submit certain information to the
manufacturer, this AD does not include that requirement.
(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 or email to: <a href="/cdn-cgi/l/email-protection#91d0dfd4bcd0d5bcd0dcded2d1f7f0f0bff6fee7"><span class="__cf_email__" data-cfemail="23626d660e62670e626e6c60634542420d444c55">[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.
[[Page 24899]]
(k) Additional Information
For more information about this AD, contact Barbara Caufield,
Aviation Safety Engineer, ECO Branch, FAA, 1200 District Avenue,
Burlington, MA 01803; phone: (781) 238-7146; email:
<a href="/cdn-cgi/l/email-protection#670506150506150649040612010e020b032701060649000811"><span class="__cf_email__" data-cfemail="41232033232033206f2220342728242d25012720206f262e37">[email protected]</span></a>.
(l) Material Incorporated by Reference
(1) The Director of the Federal Register approved the
incorporation by reference 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) Transport Canada AD CF-2022-22, dated April 22, 2022.
(ii) [Reserved]
(3) For Transport Canada AD CF-2022-22, contact Transport
Canada, Transport Canada National Aircraft Certification, 159
Cleopatra Drive, Nepean, Ontario K1A 0N5, Canada; phone: (888) 663-
3639; email: <a href="/cdn-cgi/l/email-protection#9dc9deb3dcf4efeaf2efe9f5f4f3f8eeeed9f4eff8fee9f4ebf8eeb0def2f3eef4faf3f8eef9f8f3fcebf4fafcfff4f1f4e9f8b3c9dedde9feb3fafeb3fefc"><span class="__cf_email__" data-cfemail="683c2b4629011a1f071a1c0001060d1b1b2c011a0d0b1c011e0d1b452b07061b010f060d1b0c0d06091e010f090a0104011c0d463c2b281c0b460f0b460b09">[email protected]</span></a>. You may find this material on
the Transport Canada website at tc.canada.ca/en/aviation.
(4) You may view this service information at 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.
(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, email: <a href="/cdn-cgi/l/email-protection#9ef8ecb0f7f0edeefbfdeaf7f1f0def0ffecffb0f9f1e8"><span class="__cf_email__" data-cfemail="5b3d29753235282b3e382f3234351b353a293a753c342d">[email protected]</span></a>, or go to: <a href="http://www.archives.gov/federal-register/cfr/ibr-locations.html">www.archives.gov/federal-register/cfr/ibr-locations.html</a>.
Issued on March 24, 2023.
Christina Underwood,
Acting Director, Compliance & Airworthiness Division, Aircraft
Certification Service.
[FR Doc. 2023-08624 Filed 4-24-23; 8:45 am]
BILLING CODE 4910-13-P
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