AD 2009-09-03R1

AD Final Rules - 2009-09-03R1.pdf
Copy URL
Document Versions
 Feedback
DetailsAttachments/Public Comments
AD Number:
2009-09-03R1
Document Type:
AD Final Rules
Docket Number:
FAA-2007-28077
Subject Heading:
Airworthiness Directives; Turbom ca S.A. Arriel 2B and 2B1 Turboshaft Engines
Subject:
Uncommanded in-flight engine shutdown
Status:
Current
Citation:
Federal Register: September 27, 2010 (Volume 75, Number 186)
Citation Publish Date:
09/27/2010
Effective Date:
11/01/2010
Make:
Turbomeca S.A.
Model:
Arriel 2B | Arriel 2B1
Product Type:
Engine
Product Subtype:
Affected AD:
Superseded AD:
2009-09-03
Affected By:
Superseded By: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 ⁨6⁩
[Federal Register: September 27, 2010 (Volume 75, Number 186)]


[Rules and Regulations]


[Page 59065-59067]


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


[DOCID:fr27se10-7]


––––––––––––––––––––––––––––––––––


DEPARTMENT OF TRANSPORTATION


Federal Aviation Administration


14 CFR Part 39


[Docket No. FAA-2007-28077; Directorate Identifier 2007-NE-20-AD; Amendment 39-16445;


AD 2009-09-03R1]


RIN 2120-AA64


Airworthiness Directives; Turboméca S.A. Arriel 2B and 2B1 Turboshaft Engines


AGENCY:
 
Federal Aviation Administration (FAA), DOT.


ACTION:
 
Final rule.


––––––––––––––––––––––––––––––––––


SUMMARY:
 
We are revising an existing airworthiness directive (AD) for the products listed above.


This AD results from mandatory continuing airworthiness information (MCAI) issued 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:


Since issuance of AD 2007-0109, Turboméca has released modification TU166 which


consists in inserting HP blade dampers between the HP disc and the HP blade


platform. Introduction of these dampers has demonstrated to limit axial displacement


of the HP blade relative to the disk in case of blade lock rupture or opening, therefore


eliminating the need for inspection and replacement.


We are issuing this AD to prevent an uncommanded in-flight engine shutdown which could result in


an emergency autorotation landing or an accident.


DATES:
 
This AD becomes effective November 1, 2010. The Director of the Federal Register


approved the incorporation by reference of certain publications listed in this AD as of November 1,


2010. The Director of the Federal Register approved the incorporation by reference of Turboméca


S.A. Mandatory Service Bulletin No. 292 72 2825, dated April 5, 2007, listed in this AD as of June 1,


2009 (74 FR 18981, April 27, 2009).


ADDRESSES:
 
The Docket Operations office is located at Docket Management Facility, U.S.


Department of Transportation, 1200 New Jersey Avenue, SE., West Building Ground Floor, Room


W12-140, Washington, DC 20590-0001.


1
FOR FURTHER INFORMATION CONTACT:
 
Richard Woldan, Aerospace Engineer, Engine


Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park,


Burlington, MA 01803-5299; telephone (781) 238-7136; fax (781) 238-7199.


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 May


12, 2010 (75 FR 26681). That NPRM proposed to correct an unsafe condition for the specified


products. The MCAI states that:


Since issuance of AD 2007-0109, Turboméca has released modification TU166 which


consists in inserting HP blade dampers between the HP disc and the HP blade


platform. Introduction of these dampers has demonstrated to limit axial displacement


of the HP blade relative to the disk in case of blade lock rupture or opening, therefore


eliminating the need for inspection and replacement.


Therefore, this AD revises AD 2007-0109 by retaining the same requirements of AD


2007-0109 except that applicability is limited to ARRIEL 2B, 2B1 and 2B1A engines


which do not incorporate modification TU166.


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 required different actions in this AD from those in the MCAI in order to follow


FAA policies. Any such differences are described in a separate paragraph of the AD. These


requirements take precedence over the actions copied from the MCAI.


Costs of Compliance


Based on the service information, we estimate that this AD would affect about 248 products of


U.S. registry. We also estimate that it would take about 2 work-hours per product to comply with this


AD. The average labor rate is $85 per work-hour. Based on these figures, we estimate the cost of the


AD on U.S. operators to be $42,160.


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.


2