AD 2009-22-07

AD Final Rules - 2009-22-07.pdf
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AD Number:
2009-22-07
Document Type:
AD Final Rules
Docket Number:
FAA-2009-0654
Subject Heading:
Airworthiness Directives; Saab AB, Saab Aerosystems Model SAAB 2000 Airplanes
Subject:
Engine oil.
Status:
Current
Citation:
Federal Register: October 29, 2009 (Volume 74, Number 208)
Citation Publish Date:
10/29/2009
Effective Date:
12/03/2009
Make:
Saab AB, Saab Aerosystems
Model:
SAAB 2000
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Superseded AD: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Superseded By: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: October 29, 2009 (Volume 74, Number 208)]


[Rules and Regulations]


[Page 55761-55763]


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


[DOCID:fr29oc09-5]


––––––––––––––––––––––––––––––––––


DEPARTMENT OF TRANSPORTATION


Federal Aviation Administration


14 CFR Part 39


[Docket No. FAA-2009-0654; Directorate Identifier 2008-NM-083-AD; Amendment 39-16058


AD 2009-22-07]


RIN 2120-AA64


Airworthiness Directives; Saab AB, Saab Aerosystems Model SAAB 2000 Airplanes


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


ACTION:
 
Final rule.


––––––––––––––––––––––––––––––––––


SUMMARY:
 
We are adopting a new airworthiness directive (AD) for the products listed above. This


AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation


authority of another country to identify and correct an unsafe condition on an aviation product. The


MCAI describes the unsafe condition as:


There have been reported incidents of brinelling to the self-sealing coupling Part Number


(P/N) 9304000-303 (Nipple Assembly). The wear is visible in the groove of the nipple,


caused by the socket locking balls. During tear down investigations of self-sealing


coupling P/N 9304000-305 (Socket Assembly), internal socket wear has been observed.


Wear that exceeds the allowable limits could lead to reduced oil flow, and further wear


could contribute to separation of the Self-Seal Coupling, making the engine inoperable


and subsequent shut down. As secondary damage, the generator may fail, releasing oil


into the nacelle and increasing the possibility of fire.


*
 
*
 
*
 
*
 
*


We are issuing this AD to require actions to correct the unsafe condition on these products.


DATES:
 
This AD becomes effective December 3, 2009.


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


publication listed in this AD as of December 3, 2009.


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


person at the U.S. Department of Transportation, Docket Operations, M-30, West Building Ground


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


FOR FURTHER INFORMATION CONTACT:
 
Shahram Daneshmandi, International Branch,


ANM-116, Transport Airplane Directorate, FAA, 1601 Lind Avenue, SW., Renton, Washington


98057-3356; telephone (425) 227-1112; fax (425) 227-1149.


SUPPLEMENTARY INFORMATION:


Discussion


We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 to include an AD


that would apply to the specified products. That NPRM was published in the Federal Register on July


21, 2009 (74 FR 35828). That NPRM proposed to correct an unsafe condition for the specified


products. The MCAI states:


There have been reported incidents of brinelling to the self-sealing coupling Part Number


(P/N) 9304000-303 (Nipple Assembly). The wear is visible in the groove of the nipple,


caused by the socket locking balls. During tear down investigations of self-sealing


coupling P/N 9304000-305 (Socket Assembly), internal socket wear has been observed.


Wear that exceeds the allowable limits could lead to reduced oil flow, and further wear


could contribute to separation of the Self-Seal Coupling, making the engine inoperable


and subsequent shut down. As secondary damage, the generator may fail, releasing oil


into the nacelle and increasing the possibility of fire.


For the reason described above, this Airworthiness Directive (AD) requires the inspection


of the affected nipple- and socket assemblies and, if wear is found outside the specified


limits, replacement of worn parts.


You may obtain further information by examining the MCAI in the AD docket.


Comments


We gave the public the opportunity to participate in developing this AD. We received no


comments on the NPRM or on the determination of the cost to the public.


Conclusion


We reviewed the available data and determined that air safety and the public interest require


adopting the AD as proposed.


Differences Between This AD and the MCAI or Service Information


We have reviewed the MCAI and related service information and, in general, agree with their


substance. But we might have found it necessary to use different words from those in the MCAI to


ensure the AD is clear for U.S. operators and is enforceable. In making these changes, we do not


intend to differ substantively from the information provided in the MCAI and related service


information.


We might also have required different actions in this AD from those in the MCAI in order to


follow our FAA policies. Any such differences are highlighted in a Note within the AD.


Costs of Compliance


We estimate that this AD will affect 6 products of U.S. registry. We also estimate that it will take


about 1 work-hour per product to comply with the basic requirements of this AD. The average labor