AD 2005-24-03 R1

AD Final Rules - 2005-24-03 R1.pdf
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AD Number:
2005-24-03 R1
Document Type:
AD Final Rules
Docket Number:
FAA-2006-25000
Subject Heading:
Airworthiness Directives; Boeing Model 737-600, -700, -700C, and -800 Series Airplanes
Subject:
Nacelle support fittings
Status:
Current
Citation:
(Federal Register: March 8, 2007 (Volume 72, Number 45))
Citation Publish Date:
03/08/2007
Effective Date:
04/12/2007
Make:
The Boeing Company
Model:
737-600 Series | 737-700 Series | 737-700C Series | 737-800 Series
Product Type:
Aircraft
Product Subtype:
Large Airplane
Affected AD:
Superseded AD:
2005-24-03
Affected By:
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
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[Federal Register: March 8, 2007 (Volume 72, Number 45)]


[Rules and Regulations]


[Page 10344-10346]


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


[DOCID:fr08mr07-3]


–––––––––––––––––––––––––––––––––––


DEPARTMENT OF TRANSPORTATION


Federal Aviation Administration


14 CFR Part 39


[Docket No. FAA-2006-25000; Directorate Identifier 2006-NM-096-AD; Amendment 39-14955;


AD 2005-24-03 R1]


RIN 2120-AA64


Airworthiness Directives; Boeing Model 737-600, -700, -700C, and -800 Series Airplanes


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


ACTION:
 
Final rule.


–––––––––––––––––––––––––––––––––––


SUMMARY: The FAA is revising an existing airworthiness directive (AD) that applies to certain


Boeing Model 737-600, -700, -700C, and -800 series airplanes. That AD currently requires


inspecting/measuring the length of the attachment fasteners between the nacelle support fittings and


the lower wing skin panels, and related investigative/corrective actions if necessary. That AD resulted


from a report from the manufacturer that in production, during the installation of certain attachment


fasteners for the nacelle support fittings, only one washer was installed instead of two. This new AD


corrects errors found in the existing AD. We are issuing this AD to prevent inadequate fastener


clamp-up, which could result in cracking of the fastener holes, cracking along the lower wing skin


panels, fuel leaking from the wing fuel tanks onto the engines, and possible fire.


DATES:
 
The effective date of this AD is April 12, 2007.


The Director of the Federal Register approved the incorporation by reference of a certain


publication listed in the AD as of April 12, 2007.


On December 28, 2005 (70 FR 70713, November 23, 2005), the Director of the Federal Register


approved the incorporation by reference of Boeing Service Bulletin 737-57-1275, Revision 1, dated


August 18, 2005.


ADDRESSES:
 
You may examine the AD docket on the Internet at http://dms.dot.gov or in person at


the Docket Management Facility, U.S. Department of Transportation, 400 Seventh Street, SW.,


Nassif Building, Room PL-401, Washington, DC.


Contact Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124-2207, for


service information identified in this AD.


FOR FURTHER INFORMATION CONTACT:
 
Nancy Marsh, Aerospace Engineer, Airframe


Branch, ANM-120S, FAA, Seattle Aircraft Certification Office, 1601 Lind Avenue, SW., Renton,


Washington 98057-3356; telephone (425) 917-6440; fax (425) 917-6590.
2


SUPPLEMENTARY INFORMATION:


Examining the Docket


You may examine the AD docket on the Internet at http://dms.dot.gov or in person at the Docket


Management Facility office between 9 a.m. and 5 p.m., Monday through Friday, except Federal


holidays. The Docket Management Facility office (telephone (800) 647-5227) is located on the plaza


level of the Nassif Building at the street address stated in the ADDRESSES section.


Discussion


The FAA proposed to amend part 39 of the Federal Aviation Regulations (14 CFR part 39) with


an airworthiness directive (AD) to revise AD 2005-24-03, amendment 39-14383 (70 FR 70713,


November 23, 2005). The existing AD applies to certain Boeing Model 737-600, -700, -700C, and -


800 series airplanes. The proposed AD was published in the Federal Register on June 13, 2006 (71


FR 34026). That action proposed to continue to require inspecting/measuring the length of the


attachment fasteners between the nacelle support fittings and the lower wing skin panels, and related


investigative/corrective actions if necessary. That action also proposed to correct errors found in the


existing AD.


Comment


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


considered the comment received.


Request To Cite Revised Service Information


Boeing states that, subsequent to the drafting of the subject AD, Boeing Service Bulletin 737-57-


1275, Revision 2, dated July 12, 2006, was issued. Boeing notes that Revision 2 will aid operators in


completing the required tasks by more effectively and efficiently performing the inspections, while


reducing the likelihood of introducing damage reported during completion of the previous revisions.


Boeing recommends that Boeing Service Bulletin 737-57-1275, Revision 3, dated October 17, 2006,


be incorporated into the NPRM, which further improves ease in completing the required tasks.


(Revision 3 was not yet issued when the comment was submitted, but has since been issued.)


We agree with this request. We have reviewed Revision 3 of the referenced service bulletin


which specifies that no more work is necessary on airplanes changed as shown in the original issue,


dated September 4, 2003; Revision 1, dated August 18, 2005; and Revision 2, dated July 12, 2006.


(We referred to Revision 1 in the NPRM as the appropriate source of service information for


accomplishing the required actions.) We have determined that Revision 3 shows changes of operators


in the effectivity and clarifies the oversize limits for replacement fasteners, but does not add any


further actions or increase the economic burden on operators. Therefore, we have changed the AD to


add Boeing Service Bulletin 737-57-1275, Revision 3, dated October 17, 2006, as the appropriate


source of service information for accomplishing the requirements in paragraph (f) of this AD after the


effective date of this AD.


Conclusion


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


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


We have determined that this change will neither increase the economic burden on any operator nor


increase the scope of the AD.