[Federal Register Volume 75, Number 211 (Tuesday, November 2, 2010)]
[Proposed Rules]
[Pages 67253-67254]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2010-27607]
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Proposed Rules
Federal Register
________________________________________________________________________
This section of the FEDERAL REGISTER contains notices to the public of
the proposed issuance of rules and regulations. The purpose of these
notices is to give interested persons an opportunity to participate in
the rule making prior to the adoption of the final rules.
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Federal Register / Vol. 75, No. 211 / Tuesday, November 2, 2010 /
Proposed Rules
[[Page 67253]]
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2010-1095; Directorate Identifier 2009-NE-40-AD]
RIN 2120-AA64
Airworthiness Directives; Pratt & Whitney (PW) Models PW4074 and
PW4077 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 PW PW4074 and PW4077 turbofan engines with 15th stage high-pressure
compressor (HPC) disks, part number (P/N) 55H615, installed. This
proposed AD would require removing the 15th stage HPC disk within
12,000 cycles since new (CSN) or, for any disks that exceed 12,000 CSN
after the effective date of this AD using a drawdown plan that includes
a borescope inspection (BSI) or eddy current inspection (ECI) of the
rim for cracks. This proposed AD results from multiple shop findings of
cracked 15th stage HPC disks. We are proposing this AD to prevent
cracks from propagating into the bolt hole, which could result in a
failure of the 15th stage HPC disk, uncontained engine failure, and
damage to the airplane.
DATES: We must receive any comments on this proposed AD by January 3,
2011.
ADDRESSES: Use one of the following addresses to comment on this
proposed AD.
Federal eRulemaking Portal: Go to http://www.regulations.gov and follow the instructions for sending your
comments electronically.
Mail: Docket Management Facility, U.S. Department of
Transportation, 1200 New Jersey Avenue, SE., West Building Ground
Floor, Room W12-140, Washington, DC 20590-0001.
Hand Delivery: Deliver to Mail address above between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
Fax: (202) 493-2251.
Contact Pratt & Whitney, 400 Main St., East Hartford, CT 06108;
telephone (860) 565-7700; fax (860) 565-1605, for a copy of the service
information identified in this proposed AD.
FOR FURTHER INFORMATION CONTACT: James Gray, Aerospace Engineer, Engine
Certification Office, FAA, Engine & Propeller Directorate, 12 New
England Executive Park, Burlington, MA 01803; e-mail:
[email protected]; telephone (781) 238-7742; fax (781) 238-7199.
SUPPLEMENTARY INFORMATION:
Comments Invited
We invite you to send us any written relevant data, views, or
arguments regarding this proposal. Send your comments to an address
listed under ADDRESSES. Include ``Docket No. FAA-2010-1095; Directorate
Identifier 2009-NE-40-AD'' in the subject line of your comments. We
specifically invite comments on the overall regulatory, economic,
environmental, and energy aspects of the proposed AD. We will consider
all comments received by the closing date and may amend the proposed AD
in light of those comments.
We will post all comments we receive, without change, to http://www.regulations.gov, including any personal information you provide. We
will also post a report summarizing each substantive verbal contact
with FAA personnel concerning this proposed AD. Using the search
function of the Web site, anyone can find and read the comments in any
of our dockets, including, if provided, the name of the individual who
sent the comment (or signed the comment on behalf of an association,
business, labor union, etc.). You may review the DOT's complete Privacy
Act Statement in the Federal Register published on April 11, 2000 (65
FR 19477-78).
Examining the AD Docket
You may examine the AD docket on the Internet at http://www.regulations.gov; or in person at the Docket Operations office
between 9 a.m. and 5 p.m., Monday through Friday, except Federal
holidays. The AD docket contains this proposed AD, the regulatory
evaluation, any comments received, and other information. The street
address for the Docket Operations office (telephone (800) 647-5527) is
the same as the Mail address provided in the ADDRESSES section.
Comments will be available in the AD docket shortly after receipt.
Discussion
We have received reports of multiple shop findings of cracked 15th
stage HPC disks that required removing the disks from service. As of
June 30, 2010, 53 disks with cracks in the front rail of the load and
lock slots have been reported. Engineering investigation determined
that the initiation was the result of thermal mechanical fatigue. Three
of the disks had cracks that propagated radially into the bolt holes.
These cracks could propagate further and lead to failure of the disk.
This condition, if not corrected, could result in a failure of the
15th stage HPC disk, uncontained engine failure, and damage to the
airplane.
Relevant Service Information
We have reviewed and approved the technical contents of PW Service
Bulletin (SB) PW4G-112-72-309, Revision 1, dated July 1, 2010, that
describes procedures for performing a BSI or ECI for cracks in the
front rail of the outer rim of the 15th stage HPC disk.
FAA's Determination and Requirements of the Proposed AD
We have evaluated all pertinent information and identified an
unsafe condition that is likely to exist or develop on other products
of this same type design. We are proposing this AD, which would require
removing the 15th stage HPC disk before 12,000 CSN, or for any disks
that exceed 12,000 CSN after the effective date of this AD using a
drawdown plan that includes a BSI or ECI of the rim for cracks. The
proposed AD would require you to use the service information described
previously to perform these actions.
Interim Action
These actions are interim actions and we may take further
rulemaking actions in the future.
Costs of Compliance
We estimate that this proposed AD would affect 44 engines installed
on airplanes of U.S. registry. Prorated parts
[[Page 67254]]
would cost about $66,000 per 15th stage HPC disk. Based on these
figures, we estimate the total cost of the proposed AD to U.S.
operators to be $2,904,000.
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
We have determined that this proposed AD would not have federalism
implications under Executive Order 13132. This proposed AD would not
have a substantial direct effect on the States, on the relationship
between the national Government and the States, or on the distribution
of power and responsibilities among the various levels of government.
For the reasons discussed above, I certify that the proposed AD:
1. Is not a ``significant regulatory action'' under Executive Order
12866;
2. Is not a ``significant rule'' under the DOT Regulatory Policies
and Procedures (44 FR 11034, February 26, 1979); and
3. Would not have a significant economic impact, positive or
negative, on a substantial number of small entities under the criteria
of the Regulatory Flexibility Act.
We prepared a regulatory evaluation of the estimated costs to
comply with this proposed AD. You may get a copy of this summary at the
address listed under ADDRESSES.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by
reference, Safety.
The Proposed Amendment
Under the authority delegated to me by the Administrator, the
Federal Aviation Administration proposes to amend 14 CFR part 39 as
follows:
PART 39--AIRWORTHINESS DIRECTIVES
1. The authority citation for part 39 continues to read as follows:
Authority: 49 U.S.C. 106(g), 40113, 44701.
Sec. 39.13 [Amended]
2. The FAA amends Sec. 39.13 by adding the following new
airworthiness directive:
Pratt & Whitney: Docket No. FAA-2010-1095; Directorate Identifier
2009-NE-40-AD.
Comments Due Date
(a) The Federal Aviation Administration (FAA) must receive
comments on this airworthiness directive (AD) action by January 3,
2011.
Affected ADs
(b) None.
Applicability
(c) This AD applies to Pratt & Whitney (PW) PW4074 and PW4077
turbofan engines with 15th stage high-pressure compressor (HPC)
disks, part number (P/N) 55H615, installed. These engines are
installed on, but not limited to, Boeing 777-200 series and 777-300
series airplanes.
Unsafe Condition
(d) This AD results from multiple shop findings of cracked 15th
stage HPC disks. We are issuing this AD to prevent cracks from
propagating into the bolt holes of the 15th stage HPC disk, which
could result in a failure of the 15th stage HPC disk, uncontained
engine failure, and damage to the airplane.
Compliance
(e) You are responsible for having the actions required by this
AD performed within the compliance times specified unless the
actions have already been done.
(f) For 15th stage HPC disks that have 9,865 or fewer cycles
since new (CSN) on the effective date of this AD, remove the disk
from service before accumulating 12,000 CSN.
(g) For 15th stage HPC disks that have accumulated more than
9,865 CSN on the effective date of this AD, do the following:
(1) Remove the disk from service at the next piece-part exposure
above 12,000 CSN, not to exceed 2,135 cycles-in-service (CIS) after
the effective date of this AD.
(2) For 15th stage HPC disks that are installed in the engine
and exceed 12,000 CSN, perform a borescope inspection (BSI) or eddy
current inspection (ECI):
(i) Within 2,400 cycles-since-last fluorescent penetrant
inspection or ECI, or
(ii) Within 1,200 cycles-since-last BSI, or
(iii) Within 55 cycles-in-service (CIS) after the effective date
of this AD, whichever is latest.
(3) If you see a suspected crack using a BSI from paragraph
(g)(2) of this AD, but can't visually confirm a crack, perform an
ECI within 5 CIS after the BSI.
(4) If you find a crack using any inspection, remove the disk
from service before further flight.
(h) Use paragraph 1.A. or 1.B. of the Accomplishment
Instructions ``For Engines Installed on the Aircraft'' or 1.A. or
1.B. of the Accomplishment Instructions ``For Engines Removed from
the Aircraft,'' of PW Service Bulletin PW4G-112-72-309, Revision 1,
dated July 1, 2010 to perform the inspections.
Alternative Methods of Compliance
(i) The Manager, Engine Certification Office, has the authority
to approve alternative methods of compliance for this AD if
requested using the procedures found in 14 CFR 39.19.
Related Information
(j) Contact James Gray, Aerospace Engineer, Engine Certification
Office, FAA, Engine & Propeller Directorate, 12 New England
Executive Park, Burlington, MA 01803; e-mail: [email protected];
telephone (781) 238-7742; fax (781) 238-7199, for more information
about this AD.
(k) Pratt & Whitney Service Bulletin PW4G-112-72-309 Revision 1,
dated July 1, 2010, pertains to the subject of this AD. Contact
Pratt & Whitney, 400 Main St., East Hartford, CT 06108; telephone
(860) 565-7700; fax (860) 565-1605, for a copy of this service
information.
Issued in Burlington, Massachusetts, on October 26, 2010.
Karen M. Grant,
Acting Assistant Manager, Engine and Propeller Directorate, Aircraft
Certification Service.
[FR Doc. 2010-27607 Filed 11-1-10; 8:45 am]
BILLING CODE 4910-13-P