[Federal Register: November 14, 2008 (Volume 73, Number 221)]
[Proposed Rules]
[Page 67433-67435]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr14no08-38]
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2008-1206; Directorate Identifier 2008-NE-19-AD]
RIN 2120-AA64
Airworthiness Directives; General Electric Co. (GE) CF6-80A
Series Turbofan Engines
AGENCY: Federal Aviation Administration (FAA), Department of
Transportation (DOT).
ACTION: Notice of proposed rulemaking (NPRM).
-----------------------------------------------------------------------
SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD)
for GE CF6-80A series turbofan engines with a high-pressure turbine
rotor (HPTR) stage 1 disk, part number (P/N) 9367M45G06, installed.
This proposed AD would require removing any HPTR stage 1 disk, P/N
9367M45G06, before exceeding 2,075 cycles-since-new (CSN). This
proposed AD results from an error by GE that incorrectly cited a cyclic
life of 12,600 CSN for the HPTR stage 1 disk, P/N 9367M45G06. We are
proposing this AD to prevent the HPTR stage 1 disk from exceeding its
part life which could cause fatigue cracks to start and grow. These
cracks could result in a possible uncontained disk failure and damage
to the airplane.
DATES: We must receive any comments on this proposed AD by January 13,
2009.
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.
[[Page 67434]]
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.
FOR FURTHER INFORMATION CONTACT: Robert Green, Aerospace Engineer,
Engine Certification Office, FAA, Engine & Propeller Directorate, 12
New England Executive Park, Burlington, MA 01803; e-mail:
robert.green@faa.gov; telephone (781) 238-7754; 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-2008-1206; Directorate
Identifier 2008-NE-19-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
During a recent GE internal audit, comparing the life-limited parts
certification documents to the part life limits specified in the
Airworthiness Limitations Section of the Instructions for Continuing
Airworthiness, GE found that the life limits for the CF6-80A series
engines incorrectly specified a cyclic life of 12,600 CSN for the HPTR
stage 1 disk, P/N 9367M45G06. GE has determined that the correct life
limit for the HPTR stage 1 disk, P/N 9367M45G06, is 2,075 CSN. Failure
to remove these disks from service before exceeding the new, reduced
life limit of 2,075 CSN could result in fatigue cracks, leading to a
possible uncontained disk failure and damage to the airplane.
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 from service any HPTR stage 1 disk, P/N 9367M45G06, before it
exceeds 2,075 CSN.
Costs of Compliance
We estimate that this proposed AD would affect 10 engines installed
on airplanes of U.S. registry. We also estimate that it would take
about 110 work-hours per engine to perform the proposed actions, and
that the average labor rate is $80 per work-hour. Required parts would
cost about $437,000 per engine. Based on these figures, we estimate the
total cost of the proposed AD to U.S. operators to be $4,462,000.
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, 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:
General Electric Co. (GE): Docket No. FAA-2008-1206; Directorate
Identifier 2008-NE-19-AD.
Comments Due Date
(a) The Federal Aviation Administration (FAA) must receive
comments on this airworthiness directive (AD) action by January 13,
2009.
Affected ADs
(b) None.
Applicability
(c) This AD applies to GE CF6-80A, CF6-80A1, CF6-80A2, and CF6-
80A3 turbofan engines with a high-pressure turbine rotor (HPTR)
stage 1 disk, part number (P/N) 9367M45G06, installed. These engines
are installed on, but not limited to, Airbus A310 series and Boeing
767 series airplanes.
[[Page 67435]]
Unsafe Condition
(d) This AD results from an error by GE that incorrectly cited a
cyclic life of 12,600 CSN in the Airworthiness Limitations Section
(ALS) of the Instructions for Continued Airworthiness (ICA) for the
HPTR, P/N 9367M45G06. We are issuing this AD to prevent the HPTR
stage 1 disk from exceeding its part life which could cause fatigue
cracks to start and grow. These cracks could result in a possible
uncontained disk 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.
New Reduced Life Limit for HPTR Stage 1 Disks, P/N 9367M45G06
(f) After the effective date of this AD, remove HPTR stage 1
disks, P/N 9367M45G06, from service before exceeding the new,
reduced life limit of 2,075 cycles-since-new.
Alternative Methods of Compliance
(g) 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.
Special Flight Permits
(h) Under 14 CFR part 39.23, we are prohibiting any special
flight permits.
Related Information
(i) Contact Robert Green, Aerospace Engineer, Engine
Certification Office, FAA, Engine & Propeller Directorate, 12 New
England Executive Park, Burlington, MA 01803; e-mail:
robert.green@faa.gov; telephone (781) 238-7754; fax (781) 238-7199,
for more information about this AD.
Issued in Burlington, Massachusetts, on November 7, 2008.
Peter A. White,
Assistant Manager, Engine and Propeller Directorate, Aircraft
Certification Service.
[FR Doc. E8-27080 Filed 11-13-08; 8:45 am]
BILLING CODE 4910-13-P