AD 2004-03-15 R1

AD Final Rules - 2004-03-15 R1.pdf
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AD Number:
2004-03-15 R1
Document Type:
AD Final Rules
Docket Number:
FAA-2006-23820
Subject Heading:
Airworthiness Directives; Bombardier Model DHC-8-102, -103, -106, -201, -202, -301, -311, and -315 Airplanes
Subject:
Electrical wires in the cable trough below the cabin floor
Status:
Current
Citation:
Federal Register: May 2, 2006 (Volume 71, Number 84)
Citation Publish Date:
05/02/2006
Effective Date:
03/19/2004
Make:
Bombardier Inc.
Model:
DHC-8-102 | DHC-8-103 | DHC-8-106 | DHC-8-201 | DHC-8-202 | DHC-8-301 | DHC-8-311 | DHC-8-315
Product Type:
Aircraft
Product Subtype:
Large Airplane
Affected AD:
Superseded AD:
2004-03-15
Affected By:
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
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[Federal Register: May 2, 2006 (Volume 71, Number 84)]


[Rules and Regulations]


[Page 25744-25745]


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


[DOCID:fr02my06-4]


–––––––––––––––––––––––––––––––––––


DEPARTMENT OF TRANSPORTATION


Federal Aviation Administration


14 CFR Part 39


[Docket No. FAA-2006-23820; Directorate Identifier 2005-NM-249-AD; Amendment 39-14578;


AD 2004-03-15 R1]


RIN 2120-AA64


Airworthiness Directives; Bombardier Model DHC-8-102, -103, -106, -201, -202, -301, -311, and


-315 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


Bombardier Model DHC-8-102, -103, -106, -201, -202, -301, -311, and -315 airplanes. That AD


currently requires performing a one-time inspection to detect chafing of electrical wires in the cable


trough below the cabin floor; repairing, if necessary; installing additional tie-mounts and tie-wraps;


applying sealant to rivet heads; and modifying electrical wires in certain sections. We issued that AD


to prevent chafing of electrical wires. This new AD, for certain airplanes, eliminates the requirement


to modify electrical wires in certain sections. This AD results from a report indicating that the


modification of electrical wires does not need to be done on certain airplanes subject to the existing


AD. We are issuing this AD to prevent chafing of electrical wires, which could result in an


uncommanded shutdown of an engine during flight.


DATES:
 
The effective date of this AD is March 19, 2004.


On March 19, 2004 (69 FR 7111, February 13, 2004), the Director of the Federal Register


approved the incorporation by reference of Bombardier Service Bulletin 8-53-80, Revision ''A'', dated


July 25, 2000.


On October 27, 1998 (63 FR 50501, September 22, 1998) the Director of the Federal Register


approved the incorporation by reference of Bombardier Service Bulletin S.B. 8-53-66, dated March


27, 1998.


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.
2


FOR FURTHER INFORMATION CONTACT:
 
Douglas G. Wagner, Aerospace Engineer,


Systems and Flight Test Branch, ANE-172, New York Aircraft Certification Office, FAA, 1600


Stewart Avenue, Suite 410, Westbury, New York 11590; telephone (516) 228-7306; fax (516) 794-


5531.


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 2004-03-15, amendment 39-13459 (69 FR 7111,


February 13, 2004). The existing AD applies to certain Bombardier Model DHC-8-102, -103, -106, -


201, -202, -301, -311, and -315 airplanes. The proposed AD was published in the Federal Register on


February 8, 2006 (71 FR 6408) to, for certain airplanes, eliminate the requirement to modify


electrical wires in certain sections.


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.


Changes to NPRM


We have corrected a typographical error in paragraph (i) of the NPRM by changing the date of


the Canadian airworthiness directive.


We have also revised the model designations in the NPRM to match the format of the model


designations in AD 2004-03-15.


Conclusion


We have carefully reviewed the available data 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.


Costs of Compliance


This new AD adds no new costs to affected operators; in fact, it reduces the costs for airplanes


that are not subject to the modification of certain wiring.


We estimate that 173 airplanes of U.S. registry will be subject to the inspection, installation of


additional tie-mounts and tie-wraps, and application of sealant to rivet heads that are currently


required by AD 2004-03-15. These actions take between 80 and 100 work hours per airplane, at an


average labor rate of $65 per work hour. Required parts are provided by the manufacturer at no cost


to the operator. Based on these figures, the estimated cost of these actions on U.S. operators is


between $899,600 and $1,124,500, or between $5,200 and $6,500 per airplane.