AD 2008-10-07 R1

AD Final Rules - 2008-10-07 R1.pdf
Copy URL
Document Versions
 Feedback
DetailsAttachments/Public Comments
AD Number:
2008-10-07 R1
Document Type:
AD Final Rules
Docket Number:
FAA-2009-1000
Subject Heading:
Airworthiness Directives; Boeing Model 747-100, 747-100B, 747- 100B SUD, 747-200B, 747-200C, 747-200...Show more
Subject:
Fuel tank systems
Status:
Current
Citation:
(Federal Register: October 30, 2009 (Volume 74, Number 209))
Citation Publish Date:
10/30/2009
Effective Date:
11/16/2009
Make:
The Boeing Company
Model:
747-100 Series | 747-100B Series | 747-100B SUD Series | 747-200B Series | 747-200C Series | 747-200F Series | 747-300 Series | 747SP Series ...Show more
Product Type:
Aircraft
Product Subtype:
Large Airplane
Affected AD:
Superseded AD:
2008-10-07
Affected By:
2022-17-03
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
Automatic Zoom
Actual Size
Page Fit
Page Width
⁨50⁩%
⁨75⁩%
⁨100⁩%
⁨125⁩%
⁨150⁩%
⁨200⁩%
⁨300⁩%
⁨400⁩%
125%
of ⁨9⁩
1


[Federal Register: October 30, 2009 (Volume 74, Number 209)]


[Rules and Regulations]


[Page 56098-56101]


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


[DOCID:fr30oc09-2]


––––––––––––––––––––––––––––––––––


DEPARTMENT OF TRANSPORTATION


Federal Aviation Administration


14 CFR Part 39


[Docket No. FAA-2009-1000; Directorate Identifier 2009-NM-164-AD; Amendment 39-16070;


AD 2008-10-07 R1]


RIN 2120-AA64


Airworthiness Directives; Boeing Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-


200C, 747-200F, 747-300, 747SR, and 747SP Series Airplanes


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


ACTION:
 
Final rule; request for comments.


––––––––––––––––––––––––––––––––––


SUMMARY:
 
The FAA is revising an existing airworthiness directive (AD), which applies to all


Boeing Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300,


747SR, and 747SP series airplanes. That AD currently requires revising the FAA-approved


maintenance program by incorporating new airworthiness limitations (AWLs) for fuel tank systems


to satisfy Special Federal Aviation Regulation No. 88 requirements. That AD also requires the initial


inspection of certain repetitive AWL inspections to phase in those inspections, and repair if


necessary. This AD clarifies the intended effect of the AD on spare and on-airplane fuel tank system


components. This AD results from a design review of the fuel tank systems. We are issuing this AD


to prevent the potential for ignition sources inside fuel tanks caused by latent failures, alterations,


repairs, or maintenance actions, which, in combination with flammable fuel vapors, could result in a


fuel tank explosion and consequent loss of the airplane.


DATES:
 
This AD is effective November 16, 2009.


On June 12, 2008 (73 FR 25977, May 8, 2008), the Director of the Federal Register approved the


incorporation by reference of a certain publication listed in the AD.


We must receive any comments on this AD by December 14, 2009.


ADDRESSES:
 
You may send comments by any of the following methods:


•
 
Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the instructions for


submitting comments.


•
 
Fax: 202-493-2251.


•
 
Mail: U.S. Department of Transportation, Docket Operations, M-30, West Building Ground


Floor, Room W12-140, 1200 New Jersey Avenue, SE., Washington, DC 20590.
2


•
 
Hand Delivery: U.S. Department of Transportation, Docket Operations, M-30, West Building


Ground Floor, Room W12-140, 1200 New Jersey Avenue, SE., Washington, DC 20590, between 9


a.m. and 5 p.m., Monday through Friday, except Federal holidays.


For service information identified in this AD, contact Boeing Commercial Airplanes, Attention:


Data & Services Management, P.O. Box 3707, MC 2H-65, Seattle, Washington 98124-2207;


telephone 206-544-5000, extension 1; fax 206-766-5680; e-mail me.boecom@boeing.com; Internet


https://www.myboeingfleet.com.


Examining the AD Docket


You may examine the AD docket on the Internet at http://www.regulations.gov; or in person at


the Docket Management Facility 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 Office (telephone 800-647-5527) is in the


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


FOR FURTHER INFORMATION CONTACT:
 
Douglas Bryant, Aerospace Engineer, Propulsion


Branch, ANM-140S, Seattle Aircraft Certification Office, FAA, 1601 Lind Avenue, SW., Renton,


Washington 98057-3356; telephone (425) 917-6505; fax (425) 917-6590.


SUPPLEMENTARY INFORMATION:


Discussion


On April 28, 2008, we issued AD 2008-10-07, amendment 39-15513 (73 FR 25977, May 8,


2008). That AD applies to all Boeing Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-


200C, 747-200F, 747-300, 747SR, and 747SP series airplanes. That AD requires revising the FAA-


approved maintenance program by incorporating new airworthiness limitations (AWLs) for fuel tank


systems to satisfy Special Federal Aviation Regulation No. 88 requirements. That AD also requires


the initial inspection of certain repetitive AWL inspections to phase in those inspections, and repair if


necessary. That AD resulted from a design review of the fuel tank systems. The actions specified in


that AD are intended to prevent the potential for ignition sources inside fuel tanks caused by latent


failures, alterations, repairs, or maintenance actions, which, in combination with flammable fuel


vapors, could result in a fuel tank explosion and consequent loss of the airplane.


Critical design configuration control limitations (CDCCLs) are limitation requirements to


preserve a critical ignition source prevention feature of the fuel tank system design that is necessary


to prevent the occurrence of an unsafe condition. The purpose of a CDCCL is to provide instruction


to retain the critical ignition source prevention feature during configuration change that may be


caused by alterations, repairs, or maintenance actions. A CDCCL is not a periodic inspection.


Actions Since AD Was Issued


Since we issued that AD, we have determined that it is necessary to clarify the AD's intended


effect on spare and on-airplane fuel tank system components, regarding the use of maintenance


manuals and instructions for continued airworthiness.


Section 91.403(c) of the Federal Aviation Regulations (14 CFR 91.403(c) specifies the


following:


No person may operate an aircraft for which a manufacturer's maintenance manual or


instructions for continued airworthiness has been issued that contains an airworthiness


limitation section unless the mandatory * * * procedures * * * have been complied with.