AD 2006-07-16

AD Final Rules - 2006-07-16.pdf
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AD Number:
2006-07-16
Document Type:
AD Final Rules
Docket Number:
FAA-2006-23798
Subject Heading:
Airworthiness Directives; Bombardier Model DHC-8-400 Series Airplanes
Subject:
Upper fuel access panels of the center wing
Status:
Current
Citation:
Federal Register: April 7, 2006 (Volume 71, Number 67)
Citation Publish Date:
04/07/2006
Effective Date:
05/12/2006
Make:
Bombardier Inc.
Model:
DHC-8-400 | DHC-8-401 | DHC-8-402
Product Type:
Aircraft
Product Subtype:
Large Airplane
Affected AD:
Superseded AD:
Affected By:
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
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[Federal Register: April 7, 2006 (Volume 71, Number 67)]


[Rules and Regulations]


[Page 17694-17696]


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


[DOCID:fr07ap06-2]


–––––––––––––––––––––––––––––––––––


DEPARTMENT OF TRANSPORTATION


Federal Aviation Administration


14 CFR Part 39


[Docket No. FAA-2006-23798; Directorate Identifier 2005-NM-162-AD; Amendment 39-14543;


AD 2006-07-16]


RIN 2120-AA64


Airworthiness Directives; Bombardier Model DHC-8-400 Series Airplanes


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


ACTION:
 
Final rule.


–––––––––––––––––––––––––––––––––––


SUMMARY:
 
The FAA is adopting a new airworthiness directive (AD) for certain Bombardier


Model DHC-8-400 series airplanes. This AD requires replacing all domed anchor nuts at all


attachment locations of the upper fuel access panels of the center wing in the wet bay location with


new nuts. This AD results from reported cases of corroded dome anchor nuts at the attachment


locations of the upper surface of the fuel access panel of the center wing. We are issuing this AD to


prevent corrosion or perforation of domed anchor nuts, which could result in arcing and ignition of


fuel vapor in the center wing fuel tank during a lightning strike and consequent explosion of the fuel


tank.


DATES:
 
This AD becomes effective May 12, 2006.


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


publication listed in the AD as of May 12, 2006.


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 Bombardier, Inc., Bombardier Regional Aircraft Division, 123 Garratt Boulevard,


Downsview, Ontario M3K 1Y5, Canada, for service information identified in this AD.


FOR FURTHER INFORMATION CONTACT:
 
George Duckett, Aerospace Engineer, Airframe


and Propulsion Branch, ANE-171, FAA, New York Aircraft Certification Office, 1600 Stewart


Avenue, suite 410, Westbury, New York 11590; telephone (516) 228-7325; fax (516) 794-5531.
2


SUPPLEMENTARY INFORMATION:


Examining the Docket


You may examine the airworthiness directive (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 issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 to include


an AD that would apply to certain Bombardier Model DHC-8-400 series airplanes. That NPRM was


published in the Federal Register on February 8, 2006 (71 FR 6411). That NPRM proposed to require


replacing all domed anchor nuts at all attachment locations of the upper fuel access panels of the


center wing in the wet bay location with new nuts.


Comments


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


received no comments on the NPRM or on the determination of the cost to the public.


Change to NPRM


We have revised the telephone number in the FOR FURTHER INFORMATION CONTACT


paragraph.


Conclusion


We have carefully reviewed the available data, and determined that air safety and the public


interest require adopting the AD as proposed.


Costs of Compliance


This AD will affect about 20 airplanes of U.S. registry. The required actions will take about 62


work hours per airplane, at an average labor rate of $65 per work hour. Required parts will cost about


$300 per airplane. Based on these figures, the estimated cost of the AD for U.S. operators is $86,600,


or $4,330 per airplane.


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.