[Federal Register: April 17, 2009 (Volume 74, Number 73)]
[Proposed Rules]
[Page 17799-17802]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr17ap09-13]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2007-27687; Directorate Identifier 2000-NE-42-AD]
RIN 2120-AA64
Airworthiness Directives; General Electric Company CF34-1A, -3A,
-3A1, -3A2, -3B, and -3B1 Turbofan Engines
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Supplemental Notice of proposed rulemaking (NPRM); reopening of
comment period.
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SUMMARY: This notice revises an earlier proposed airworthiness
directive (AD), and supersedes an existing AD applicable to General
Electric Company (GE) CF34-1A, -3A, -3A1, -3A2, -3B, and -3B1 turbofan
engines. This proposed AD reopens the comment period, since we added
additional requirements based on responses we received. This proposed
AD would now require:
Inspecting certain fan disks for electrical arc-out
indications,
Removing from service fan disks with electrical arc-out
indications,
Performing tactile and enhanced visual (TEV) inspections,
fluorescent penetrant inspections (FPI), and eddy current inspections
(ECI) on certain disks that have already had a shop-level inspection,
and
Repetitive FPI and ECI on certain fan disks.
This proposed AD results from an updated risk analysis by GE that
shows we need to take corrective action that is more stringent. We are
proposing this AD to prevent an uncontained failure of the fan disk,
which could result in damage to the airplane.
DATES: We must receive any comments on this proposed AD by June 16,
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.
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 General Electric Company via Lockheed Martin Technology
Services, 10525 Chester Road, Suite C, Cincinnati, Ohio 45215;
telephone (513) 672-8400; fax (513) 672-8422, for the service
information identified in this proposed AD.
FOR FURTHER INFORMATION CONTACT: Tara Chaidez, Aerospace Engineer,
Engine Certification Office, FAA, Engine and Propeller Directorate, 12
New England Executive Park, Burlington, MA 01803; e-mail:
tara.chaidez@faa.gov; telephone (781) 238-7773; 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-2007-27687;
Directorate Identifier 2000-NE-42-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 proposed to amend 14 CFR part 39 by superseding AD 2007-07-07R1,
Amendment 39-15179 (72 FR 49183, August 28, 2007). That AD requires a
onetime inspection of certain fan disks for electrical arc-out
indications, replacing fan disks with electrical arc-out indications,
and reducing the life limit of certain fan disks. That NPRM was
prompted by us determining that we inadvertently left out an inspection
requirement in Table C of AD 2007-07-07R1 to perform a shop inspection
on disks that have greater than 6,000 flight hours and have already
undergone a shop inspection. That condition, if not corrected, could
result in an uncontained fan disk failure and airplane damage. On
January 18, 2008, we published that proposal as an NPRM in the Federal
Register (73 FR 3425). That NPRM would have required:
Replacing certain fan disks installed on regional jets
within 15 days after the effective date of the proposed AD, and
On-wing and shop-level inspections of fan disks for
electrical arc-out defects on fan disks installed on regional jets, and
Shop-level inspections of fan disks for electrical arc-out
defects on fan disks installed on business jets.
Since we issued that NPRM, GE performed an updated risk analysis
that shows we need to take corrective action that is more stringent
than that proposed in the NPRM. We also propose to amend 14 CFR part 39
by superseding AD 2007-05-16, Amendment 39-14977 (72 FR 10054, March 7,
2007). That AD requires a onetime visual and tactile inspection of
certain areas of certain P/N and SN fan disks for an arc-out defect,
within 20 engine flight hours after the effective date of that AD.
Since we issued that AD, GE has added those SN fan disks to the
applicable service bulletins for the repetitive inspection requirements
of this proposed AD.
Since these changes expand the scope of the originally proposed
rule, we have determined that it is necessary to reopen the comment
period to provide additional opportunity for public comment. This
condition, if not corrected, could result in an uncontained failure of
the fan disk and damage to the airplane.
[[Page 17800]]
Relevant Service Information
We have reviewed and approved the technical contents of GE Alert
Service Bulletins (ASBs) No. CF34-BJ S/B 72-A0212, Revision 04, dated
October 27, 2008; CF34-BJ S/B 72-A0234, dated October 27, 2008; CF34-BJ
S/B 72-A0235, dated October 27, 2008; CF34-AL S/B 72-A0233, Revision
04, dated October 27, 2008; CF34-AL S/B 72-A0252, dated October 27,
2008; and CF34-AL S/B 72-A0253, dated October 27, 2008. These ASBs list
the affected fan disks by serial number, part number, and tier, and
describe procedures for performing TEV inspections, FPI, and ECI for
cracks and electrical arc-out defects.
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
initial and repetitive FPI, ECI, and TEV inspections. The proposed AD
would require you to use the service information described previously
to perform these actions.
Costs of Compliance
We estimate that this proposed AD would affect 1,531 engines
installed on airplanes of U.S. registry. We also estimate that it would
take about 2 work-hours per engine to perform the proposed on-wing
inspection on 300 engines, and 4 work-hours per engine to perform the
proposed shop inspection on 1,531 engines. The average labor rate is
$80 per work-hour. There are no required parts. Based on these figures,
we estimate the total cost of the proposed AD to U.S. operators to be
$537,920.
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 removing Amendment 39-14977 (72 FR
10054, March 7, 2007) and Amendment 39-15179 (72 FR 49183, August 28,
2007), and by adding a new airworthiness directive to read as follows:
General Electric Company: Docket No. FAA-2007-27687; Directorate
Identifier 2000-NE-42-AD.
Comments Due Date
(a) The Federal Aviation Administration (FAA) must receive
comments on this airworthiness directive (AD) action by June 16,
2009.
(b) This AD supersedes AD 2007-05-16, Amendment 39-14977 and AD
2007-07-07R1, Amendment 39-15179.
Applicability
(c) This AD applies to General Electric Company (GE) CF34-1A, -
3A, -3A1, -3A2, -3B, and -3B1 turbofan engines, with fan disks part
numbers (P/Ns) 5921T18G01, 5921T18G09, 5921T18G10, 5921T54G01,
5922T01G02, 5922T01G04, 5922T01G05, 6020T62G04, 6020T62G05,
6078T00G01, 6078T57G01, 6078T57G02, 6078T57G03, 6078T57G04,
6078T57G05, and 6078T57G06 installed. These engines are installed
on, but not limited to, Bombardier Canadair airplane models CL-600-
2A12, -2B16, and -2B19.
Unsafe Condition
(d) This AD results from an updated risk analysis by GE that
shows we need to take corrective action that is more stringent. We
are issuing this AD to prevent an uncontained failure of the fan
disk, which could result in 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.
Removing Certain Fan Disks from Service
(f) For fan disks listed by P/N and serial number (SN) in Table
2 of GE Alert Service Bulletin (ASB) CF34-BJ S/B 72-A0212, Revision
04, dated October 27, 2008; or in Table 2 of GE ASB CF34-AL S/B 72-
A0233, Revision 04, dated October 27, 2008 that have 8,000 CSN or
more on the effective date of this AD, remove fan disks from service
within 15 days after the effective date of this AD.
(g) For fan disks listed by P/N and serial number (SN) in Table
2 of GE Alert Service Bulletin (ASB) CF34-BJ S/B 72-A0212, Revision
04, dated October 27, 2008; or in Table 2 of GE ASB CF34-AL S/B 72-
A0233, Revision 04, dated October 27, 2008, that have fewer than
8,000 CSN on the effective date of this AD, remove fan disks from
service before accumulating 8,000 CSN.
Inspections of Tier 1 Fan Disks
(h) For CF34-3A1 engines with fan drive shaft, P/N 6036T78P02,
and airworthiness limitation section life limit of 22,000 CSN, and
CF34-3B1 turbofan engines with Tier 1 fan disks listed by P/N, SN,
and Tier in Table 1 of GE ASB No. CF34-AL S/B 72-A0233, Revision 04,
dated October 27, 2008, do the following:
Tactile and Enhanced Visual (TEV) Inspections, Fluorescent Penetrant
Inspections (FPI), and Eddy Current Inspections (ECI)
(1) For Tier 1 fan disks not already inspected using GE ASB No.
CF34-AL S/B 72-A0233, Revision 03, dated June 27, 2007, or earlier
issue, do the following:
(i) Perform a TEV inspection, an FPI, and an ECI on the Tier 1
fan disks within 650 cycles-in-service (CIS) after the effective
date of this AD. Use paragraph 3.A of the Accomplishment
Instructions of GE ASB CF34-AL S/B 72-A0233, Revision 04, dated
[[Page 17801]]
October 27, 2008, to perform the TEV inspection, FPI, and ECI.
(ii) Thereafter, perform repetitive ECI on the Tier 1 fan disks
within intervals of 3,000 cycles-since-last inspection (CSLI). Use
paragraph 3.A of the Accomplishment Instructions of GE ASB CF34-AL
S/B 72-A0252, dated October 27, 2008, to perform the repetitive ECI.
(2) For Tier 1 fan disks, listed by P/N, SN, and Tier in Table 1
of GE ASB No. CF34-AL S/B 72-A0233, Revision 04, dated October 27,
2008; already inspected using GE ASB No. CF34-AL S/B 72-A0233,
Revision 03, dated June 27, 2007, or earlier issue, do the
following:
(i) For Tier 1 fan disks with 2,500 or more CSLI on the
effective date of this AD, perform an ECI on the Tier 1 fan disks
within 500 CIS after the effective date of this AD. Use paragraph
3.A of the Accomplishment Instructions of GE ASB CF34-AL S/B 72-
A0252, dated October 27, 2008, to perform the ECI.
(ii) For Tier 1 fan disks with fewer than 2,500 CSLI on the
effective date of this AD, perform an ECI on the Tier 1 fan disks
within 3,000 CSLI. Use paragraph 3.A of the Accomplishment
Instructions of GE ASB CF34-AL S/B 72-A0252, dated October 27, 2008,
to perform the ECI.
(iii) Thereafter, perform repetitive ECI on the Tier 1 fan disks
within intervals of 3,000 CSLI. Use paragraph 3.A of the
Accomplishment Instructions of GE ASB CF34-AL S/B 72-A0252, dated
October 27, 2008, to perform the repetitive ECI.
Inspections of Tier 2 Fan Disks
(i) For CF34-3A1 engines with fan drive shaft, P/N 6036T78P02,
and airworthiness limitation section life limit of 22,000 CSN, and
CF34-3B1 turbofan engines with Tier 2 fan disks listed by P/N, SN,
and Tier in Table 1 of GE ASB No. CF34-AL S/B 72-A0233, Revision 04,
dated October 27, 2008, do the following:
TEV Inspections, FPI, and ECI
(1) For Tier 2 fan disks not already inspected using GE ASB No.
CF34-AL S/B 72-A0233, Revision 03, dated June 27, 2007, or earlier
issue, do the following:
(i) Perform a TEV inspection, an FPI, and an ECI on the Tier 2
fan disks within 2,000 CIS after the effective date of this AD, or
within 5,000 CIS after September 12, 2007, or by March 19, 2012,
whichever occurs first. Use paragraph 3.A of the Accomplishment
Instructions of GE ASB CF34-AL S/B 72-A0233, Revision 04, dated
October 27, 2008, to perform the TEV inspection, FPI, and ECI.
(ii) Thereafter, perform repetitive eddy current inspections on
the Tier 2 fan disks within intervals of 3,000 CSLI. Use paragraph
3.A of the Accomplishment Instructions of GE ASB CF34-AL S/B 72-
A0252, dated October 27, 2008, to perform the repetitive ECI.
(2) For Tier 2 fan disks, listed by P/N, SN, and Tier in Table 1
of GE ASB No. CF34-AL S/B 72-A0233, Revision 04, dated October 27,
2008; already inspected using GE ASB No. CF34-AL S/B 72-A0233,
Revision 03, dated June 27, 2007, or earlier issue, do the
following:
(i) For Tier 2 fan disks with 2,500 or more CSLI on the
effective date of this AD, perform an ECI on the Tier 2 fan disks
within 500 CIS after the effective date of this AD. Use paragraph
3.A of the Accomplishment Instructions of GE ASB CF34-AL S/B 72-
A0252, dated October 27, 2008, to perform the ECI.
(ii) For Tier 2 fan disks with fewer than 2,500 CSLI on the
effective date of this AD, perform an ECI on the Tier 2 fan disks
within 3,000 CSLI. Use paragraph 3.A of the Accomplishment
Instructions of GE ASB CF34-AL S/B 72-A0252, dated October 27, 2008,
to perform the ECI.
(iii) Thereafter, perform repetitive ECI on the Tier 2 fan disks
within intervals of 3,000 CSLI. Use paragraph 3.A of the
Accomplishment Instructions of GE ASB CF34-AL S/B 72-A0252, dated
October 27, 2008, to perform the repetitive ECI.
Inspections of Tier 3 Fan Disks
(j) For CF34-3A1 engines with fan drive shaft, P/N 6036T78P02,
and airworthiness limitation section life limit of 22,000 CSN, and
CF34-3B1 turbofan engines with Tier 3 fan disks, listed by P/N, SN,
and Tier in Table 1 of GE ASB No. CF34-AL S/B 72-A0233, Revision 04,
dated October 27, 2008, do the following:
TEV Inspections, FPI, and ECI
(1) For Tier 3 fan disks not already inspected using GE ASB No.
CF34-AL S/B 72-A0233, Revision 03, dated June 27, 2007, or earlier
issue, perform a TEV inspection, an FPI, and an ECI on the Tier 3
fan disks within 5,000 CIS after September 12, 2007, or by March 19,
2012, whichever is earlier. Use paragraph 3.A of the Accomplishment
Instructions of GE ASB CF34-AL S/B 72-A0253, Revision 04, dated
October 27, 2008, to perform the TEV inspection, FPI, and ECI.
(2) For Tier 3 fan disks, listed by P/N, SN, and Tier in Table 1
of GE ASB No. CF34-AL S/B 72-A0233, Revision 04, dated October 27,
2008; already inspected using GE ASB No. CF34-AL S/B 72-A0233,
Revision 03, dated June 27, 2007, or earlier issue, perform a TEV
inspection and an ECI on the Tier 3 fan disks at the next shop
visit. Use paragraph 3.A of the Accomplishment Instructions of GE
ASB CF34-AL S/B 72-A0253, dated October 27, 2008, to perform the TEV
inspection and ECI.
(3) Repetitive ECI on the Tier 3 fan disks are not required.
Inspections of Tier 1 Fan Disks
(k) For CF34-1A turbofan engines with fan drive shaft, P/N
6036T78P02, and airworthiness limitation section life limit of
15,000 CSN, CF34-3A, CF34-3A2, and CF34-3B turbofan engines with
Tier 1 fan disks listed by P/N, SN, and Tier in Table 1 of GE ASB
No. CF34-BJ S/B 72-A0212, Revision 04, dated October 27, 2008, do
the following:
TEV Inspections, FPI, and ECI
(1) For Tier 1 fan disks not already inspected using GE ASB No.
CF34-BJ S/B 72-A0212, Revision 03, dated June 27, 2007, or earlier
issue:
(i) Perform a TEV inspection, FPI, and ECI on the Tier 1 fan
disks within 350 CIS after the effective date of this AD. Use
paragraph 3.A of the Accomplishment Instructions of GE ASB CF34-BJ
S/B 72-A0212, Revision 04, dated October 27, 2008, to perform the
TEV inspection.
(ii) Thereafter, perform repetitive ECI on the Tier 1 fan disks
within intervals of 3,000 CSLI. Use paragraph 3.A of the
Accomplishment Instructions of GE ASB CF34-BJ S/B 72-A0235, dated
October 27, 2008, to perform the repetitive ECI.
(2) For Tier 1 fan disks, listed by P/N, SN, and Tier in Table 1
of GE ASB No. CF34-BJ S/B 72-A0212, Revision 04, dated October 27,
2008; already inspected using GE ASB No. CF34-BJ S/B 72-A0212,
Revision 03, dated June 27, 2007, or earlier issue, do the
following:
(i) For Tier 1 fan disks with 2,500 or more CSLI on the
effective date of this AD, perform an ECI on the Tier 1 fan disks
within 500 CIS after the effective date of this AD. Use paragraph
3.A of the Accomplishment Instructions of GE ASB CF34-BJ S/B 72-
A0235, dated October 27, 2008, to perform the ECI.
(ii) For Tier 1 fan disks with fewer than 2,500 CSLI on the
effective date of this AD, perform an ECI on the Tier 1 fan disks
within 3,000 CSLI after the effective date of this AD. Use paragraph
3.A of the Accomplishment Instructions of GE ASB CF34-BJ S/B 72-
A0235, dated October 27, 2008, to perform the ECI.
(iii) Thereafter, perform repetitive ECI on the Tier 1 fan disks
within intervals of 3,000 CSLI. Use paragraph 3.A of the
Accomplishment Instructions of GE ASB CF34-AL S/B 72-A0235, dated
October 27, 2008, to perform the repetitive ECI.
Inspections of Tier 2 Fan Disks
(l) For CF34-1A turbofan engines with fan drive shaft, P/N
6036T78P02, and airworthiness limitation section life limit of
15,000 CSN, CF34-3A, CF34-3A2, and CF34-3B turbofan engines with
Tier 2 fan disks listed by P/N, SN, and Tier in Table 1 of GE ASB
No. CF34-AL S/B 72-A0212, Revision 04, dated October 27, 2008, do
the following:
TEV Inspections, FPI, and ECI
(1) For Tier 2 fan disks not already inspected using GE ASB No.
CF34-AL S/B 72-A0212, Revision 03, dated June 27, 2007, or earlier
issue, do the following:
(i) Perform a TEV inspection, FPI, and ECI on the Tier 2 fan
disks within 2,000 CIS after the effective date of this AD, or
within 3,500 CIS after September 12, 2007, or by March 19, 2012,
whichever occurs first. Use paragraph 3.A of the Accomplishment
Instructions of GE ASB CF34-BJ S/B 72-A0212, Revision 04, dated
October 27, 2008, to perform the TEV inspection, FPI, and ECI.
(ii) Thereafter, perform repetitive ECI on the Tier 2 fan disks
within intervals of 3,000 CSLI. Use paragraph 3.A of the
Accomplishment Instructions of GE ASB CF34-BJ S/B 72-A0235, dated
October 27, 2008, to perform the repetitive ECI.
(2) For Tier 2 fan disks, listed by P/N, SN, and Tier in Table 1
of GE ASB No. CF34-BJ S/B 72-A0212, Revision 04, dated October 27,
2008; already inspected using GE ASB
[[Page 17802]]
No. CF34-BJ S/B 72-A0212, Revision 03, dated June 27, 2007, or
earlier issue, do the following:
(i) For Tier 2 fan disks with 2,500 or more CSLI on the
effective date of this AD, perform an ECI on the Tier 2 fan disks
within 500 CIS after the effective date of this AD. Use paragraph
3.A of the Accomplishment Instructions of GE ASB CF34-BJ S/B 72-
A0235, dated October 27, 2008, to perform the ECI.
(ii) For Tier 2 fan disks with fewer than 2,500 CSLI on the
effective date of this AD, perform an ECI on the Tier 2 fan disks
within 3,000 CSLI. Use paragraph 3.A of the Accomplishment
Instructions of GE ASB CF34-BJ S/B 72-A0235, dated October 27, 2008,
to perform the ECI.
(iii) Thereafter, perform repetitive ECI on the Tier 2 fan disks
within intervals of 3,000 CSLI. Use paragraph 3.A of the
Accomplishment Instructions of GE ASB CF34-BJ S/B 72-A0235, dated
October 27, 2008, to perform the repetitive ECI.
Inspections of Tier 3 Fan Disks
(m) For CF34-1A turbofan engines with fan drive shaft, P/N
6036T78P02, and airworthiness limitation section life limit of
15,000 CSN, CF34-3A, CF34-3A2, and CF34-3B turbofan engines with
Tier 3 fan disks listed by P/N, SN, and Tier in Table 1 of GE ASB
No. CF34-BJ S/B 72-A0212, Revision 04, dated October 27, 2008, do
the following:
TEV Inspections, FPI, and ECI
(1) For Tier 3 fan disks not already inspected using GE ASB No.
CF34-AL S/B 72-A0212, Revision 03, dated June 27, 2007, or earlier
issue, perform a TEV inspection, FPI, and ECI on the Tier 3 fan
disks within 3,500 CIS after September 12, 2007, or by March 19,
2012, whichever is earlier. Use paragraph 3.A of the Accomplishment
Instructions of GE ASB CF34-AL S/B 72-A0234, dated October 27, 2008,
to perform the TEV inspection, FPI, and ECI.
(2) For Tier 3 fan disks, listed by P/N, SN, and Tier in Table 1
of GE ASB No. CF34-BJ S/B 72-A0212, Revision 04, dated October 27,
2008; already inspected using GE ASB No. CF34-BJ S/B 72-A0212,
Revision 03, dated June 27, 2007, or earlier issue, perform a TEV
inspection and an ECI on the Tier 3 fan disks within 3,500 CSLI, but
no later than March 19, 2012. Use paragraph 3.A of the
Accomplishment Instructions of GE ASB CF34-BJ S/B 72-A0234, dated
October 27, 2008, to perform the TEV inspection and ECI.
(3) Repetitive ECI on the Tier 3 fan disks are not required.
Alternative Methods of Compliance
(n) 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.
Mandatory Terminating Action
(o) Remove from service, Tier 1 and Tier 2 fan disks listed by
P/N, SN, and Tier in Table 1 of GE ASB No. CF34-AL S/B 72-A0233,
Revision 04, dated October 27, 2008; or CF34-BJ S/B 72-0212,
Revision 04, dated October 27, 2008, before they exceed their
limited life cycles or September 30, 2018, whichever occurs first.
Related Information
(p) Contact Tara Chaidez, Aerospace Engineer, Engine
Certification Office, FAA, Engine and Propeller Directorate, 12 New
England Executive Park, Burlington, MA 01803; e-mail:
tara.chaidez@faa.gov; telephone (781) 238-7773; fax (781) 238-7199,
for more information about this AD.
(q) The following GE Alert Service Bulletins pertain to the
subject of this AD:
CF34-AL S/B 72-A0233, Revision 04, dated October 27,
2008,
CF34-AL S/B 72-A0252, dated October 27, 2008,
CF34-AL S/B 72-A0253, dated October 27, 2008,
CF34-BJ S/B 72-A0212, Revision 04, dated October 27,
2008,
CF34-BJ S/B 72-A0234, dated October 27, 2008, and
CF34-BJ S/B 72-A0235, dated October 27, 2008.
Contact General Electric Company via Lockheed Martin Technology
Services, 10525 Chester Road, Suite C, Cincinnati, Ohio 45215;
telephone (513) 672-8400; fax (513) 672-8422, for a copy of this
service information.
Issued in Burlington, Massachusetts, on April 9, 2009.
Peter A. White,
Assistant Manager, Engine and Propeller Directorate, Aircraft
Certification Service.
[FR Doc. E9-8787 Filed 4-16-09; 8:45 am]
BILLING CODE 4910-13-P