AD 2007-11-18R1

AD Final Rules - 2007-11-18R1.pdf
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AD Number:
2007-11-18R1
Document Type:
AD Final Rules
Docket Number:
FAA-2006-24171
Subject Heading:
Airworthiness Directives; General Electric Company CF6-50C Series Turbofan Engines
Subject:
Forward fan stator cases
Status:
Current
Citation:
Federal Register: November 27, 2009
Citation Publish Date:
11/27/2009
Effective Date:
01/04/2010
Make:
General Electric Company
Model:
CF6-50C | CF6-50C1 | CF6-50C2
Product Type:
Engine
Product Subtype:
Affected AD:
Superseded AD:
2007-11-18
Affected By:
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
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[Federal Register: November 27, 2009 (Volume 74, Number 227)]


[Rules and Regulations]


[Page 62215-62217]


From the Federal Register Online via GPO Access [wais.access.gpo.gov]


[DOCID:fr27no09-5]


––––––––––––––––––––––––––––––––––


DEPARTMENT OF TRANSPORTATION


Federal Aviation Administration


14 CFR Part 39


[Docket No. FAA-2006-24171; Directorate Identifier 2006-NE-08-AD; Amendment 39-16093;


AD 2007-11-18R1]


RIN 2120-AA64


Airworthiness Directives; General Electric Company CF6-50C Series Turbofan Engines


AGENCY:
 
Federal Aviation Administration (FAA), Department of Transportation (DOT).


ACTION:
 
Final rule.


––––––––––––––––––––––––––––––––––


SUMMARY:
 
The FAA is revising an existing airworthiness directive (AD) for General Electric


Company (GE) CF6-50C series turbofan engines. That AD currently requires reworking certain


forward fan stator cases and installing a fan module secondary containment shield. This AD requires


the same actions but eliminates a certain service bulletin from the compliance method. This AD


results from a review that shows that only one of the service bulletins referenced in the original AD is


applicable as a compliance method. We are issuing this AD revision to eliminate a certain service


bulletin from the compliance method and to prevent uncontained fan blade failures, which can result


in separation of airplane hydraulic lines, damage to critical airplane systems, and possible loss of


airplane control.


DATES:
 
This AD becomes effective January 4, 2010. The Director of the Federal Register approved


the incorporation by reference of certain publications listed in the regulations as of January 4, 2010.


ADDRESSES:
 
You can get the service information identified in this AD from General Electric


Company, GE-Aviation, Room 285, 1 Newmann Way, Cincinnati, OH 45215, telephone (513) 552-


3272; fax (513) 552-3329; e-mail: geae.aoc@ge.com.


The Docket Operations office is located at Docket Management Facility, U.S. Department of


Transportation, 1200 New Jersey Avenue, SE., West Building Ground Floor, Room W12-140,


Washington, DC 20590-0001.


FOR FURTHER INFORMATION CONTACT:
 
James Rosa, Aerospace Engineer, Engine


Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park,


Burlington, MA 01803; e-mail: james.rosa@faa.gov; telephone (781) 238-7152; fax (781) 238-7199.
2


SUPPLEMENTARY INFORMATION:
 
The FAA proposed to amend 14 CFR part 39 with a


proposed AD. The proposed AD applies to GE CF6-50C series turbofan engines. We published the


proposed AD in the Federal Register on June 24, 2009 (74 FR 30018). That action proposed to


require reworking certain forward fan stator cases, installing a fan module secondary containment


shield on Airbus A300 series airplanes, and eliminating GE Service Bulletin (SB) No. CF6-50 S/B


72-0986, Revision 2, dated March 21, 2007, as an acceptable compliance method.


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 AD, the regulatory evaluation, any comments received, and


other information. The street address for the Docket Operations office (telephone (800) 647-5527) is


provided in the ADDRESSES section. Comments will be available in the AD docket shortly after


receipt.


Comments


We provided the public the opportunity to participate in the development of this AD. We have


considered the comments received.


Request To Change Service Bulletin References


One commenter, Airbus, requests that we reference the latest revision of GE SB No. CF6-50 S/B


72-0985 in the AD, which is Revision 3, dated August 22, 2007.


We agree. We changed the SB references in the AD to Revision 3.


Request To Remove European Aviation Safety Agency (EASA) AD Reference


Airbus requests that we remove the reference to EASA AD 2004-0007 from the AD, as it has


been cancelled by EASA.


We agree and have removed the EASA AD reference.


Request To Include GE SB No. CF6-50 S/B 72-0986


One commenter, Tradewinds Airlines, requests that we include GE SB No. CF6-50 S/B 72-0986


in the AD, as this will give credit for previous installation of required shields.


We agree. If shields have been previously installed per GE SB No. CF6-50 S/B 72-0986, CF6-50


S/B 72-0986, Revision 01, or CF6-50 S/B 72-0986, Revision 02, credit will be allowed for that


previous installation.


Conclusion


We have carefully reviewed the available data, including the comments received, and determined


that air safety and the public interest require adopting the AD with the changes described previously.


We have determined that these changes will neither increase the economic burden on any operator


nor increase the scope of the AD.


Costs of Compliance


We estimate that this AD will affect 40 CF6-50C series turbofan engines installed on airplanes of


U.S. registry. We also estimate that it will take about 2.5 work hours per engine to perform the