
[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]                         

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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; Turbom[eacute]ca S.A. Arriel 2B and 2B1 
Turboshaft Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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SUMMARY: We are revising an existing airworthiness directive (AD) for 
the products listed above. This AD results from mandatory continuing

[[Page 59066]]

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, Turbom[eacute]ca 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 
Turbom[eacute]ca 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.

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, Turbom[eacute]ca 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.
    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.

Regulatory Findings

    We determined that this AD will not have federalism implications 
under Executive Order 13132. This AD will not have a substantial direct 
effect on the States, on the relationship between the national 
government and the States, or on the distribution of power and 
responsibilities among the various levels of government.
    For the reasons discussed above, I certify this AD:
    1. Is not a ``significant regulatory action'' under Executive Order 
12866;
    2. Is not a ``significant rule'' under the DOT Regulatory Policies 
and Procedures (44 FR 11034, February 26, 1979); and
    3. Will not have a significant economic impact, positive or 
negative, on a substantial number of small entities under the criteria 
of the Regulatory Flexibility Act.
    We prepared a regulatory evaluation of the estimated costs to 
comply with this AD and placed it in the AD docket.

Examining the AD Docket

    You may examine the AD docket on the Internet at http://
www.regulations.gov; or in person at the Docket Operations office 
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 Operations office (phone (800) 647-5527) is provided in the 
ADDRESSES section. Comments will be available in the AD docket shortly 
after receipt.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, Safety.

Adoption of the Amendment

0
Accordingly, under the authority delegated to me by the Administrator, 
the FAA amends 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

0
1. The authority citation for part 39 continues to read as follows:

    Authority: 49 U.S.C. 106(g), 40113, 44701.


Sec.  39.13  [Amended]

0
2. The FAA amends Sec.  39.13 by removing Amendment 39-15889 (74 FR 
18981), and adding a new airworthiness directive, Amendment 39-16445, 
to read as follows:

2009-09-03R1 Turbom[eacute]ca S.A.: Amendment 39-16445. Docket No.

[[Page 59067]]

FAA-2007-28077; Directorate Identifier 2007-NE-20-AD.

Effective Date

    (a) This airworthiness directive (AD) becomes effective November 
1, 2010.

Affected ADs

    (b) This AD revises AD 2009-09-03, Amendment 39-15889.

Applicability

    (c) This AD applies to Turbom[eacute]ca S.A. ARRIEL 2B and 2B1 
turboshaft engines that don't incorporate modification TU166. These 
engines are installed on, but not limited to, Eurocopter AS 350 B3 
and EC 130 B4 helicopters.

Reason

    (d) This AD results from:
    Since issuance of AD 2007-0109, Turbom[eacute]ca 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.

Actions and Compliance

    (e) Unless already done, do the following actions:

Initial Inspection

    (1) Perform an initial high-pressure (HP) turbine borescope 
inspection according to Turbom[eacute]ca S.A. Mandatory Service 
Bulletin (MSB) No. 292 72 2825, Version B, dated September 21, 2009, 
or earlier version as follows:
    (i) For engines with fewer than 500 hours and 450 cycles since 
new or since the last HP turbine borescope inspection, inspect 
before reaching 600 hours or 500 cycles whichever occurs first. 
Replace HP turbine modules with rearward turbine blade displacement 
greater than 0.5 mm.
    (ii) For the remaining engines, inspect within the next 100 
hours. Replace HP turbine modules with rearward turbine blade 
displacement greater than 0.5 mm.

Repetitive Inspections

    (2) Perform repetitive HP turbine borescope inspections 
according to Turbom[eacute]ca S.A. MSB No. 292 72 2825, Version B, 
dated September 21, 2009 or earlier version:
    (i) Within 600 hours or 500 cycles from the previous inspection, 
whichever occurs first, if the rearward displacement of the turbine 
blades was less than 0.2 mm. Replace HP turbine modules with 
rearward turbine blade displacement greater than 0.5 mm.
    (ii) Within 100 hours of the previous inspection if the rearward 
displacement of the turbine blades was between 0.2 mm and 0.5 mm. 
Replace HP turbine modules with rearward turbine blade displacement 
greater than 0.5 mm.

Optional Terminating Action

    (f) Incorporating modification TU166 terminates the repetitive 
inspection requirements of paragraphs (e)(2)(i) and (e)(2)(ii) of 
this AD.

FAA AD Differences

    (g) For clarification, we restructured the actions and 
compliance wording of this AD.
    (h) We deleted the Turbom[eacute]ca reporting requirement from 
the AD.
    (i) Although EASA Airworthiness Directive 2007-0109R1, dated 
November 9, 2009, applies to the ARRIEL 2B1A engine, this AD does 
not apply to that model because it has no U.S. type certificate.

Alternative Methods of Compliance (AMOCs)

    (j) The Manager, Engine Certification Office, FAA, has the 
authority to approve AMOCs for this AD, if requested using the 
procedures found in 14 CFR 39.19.

Related Information

    (k) Refer to EASA Airworthiness Directive 2007-0109R1, dated 
November 9, 2009, and Turbom[eacute]ca S.A. MSB No. 292 72 2825, 
Version B, dated September 21, 2009, or earlier version, for related 
information.
    (l) 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, for more information about this AD.

Material Incorporated by Reference

    (m) You must use Turbom[eacute]ca S.A. Mandatory Service 
Bulletin No. 292 72 2825, Version B, dated September 21, 2009, to do 
the actions required by this AD, unless the AD specifies otherwise.
    (1) The Director of the Federal Register previously approved the 
incorporation by reference of Turbom[eacute]ca S.A. Mandatory 
Service Bulletin No. 292 72 2825, dated April 5, 2007, on June 1, 
2009 (74 FR 18981, April 27, 2009).
    (2) For service information identified in this AD, contact 
Turbom[eacute]ca, 40220 Tarnos, France; telephone 33 05 59 74 40 00, 
fax 33 05 59 74 45 15.
    (3) You may review copies at the FAA, New England Region, 12 New 
England Executive Park, Burlington, MA; or at the National Archives 
and Records Administration (NARA). For information on the 
availability of this material at NARA, call (202) 741-6030, or go 
to: http://www.archives.gov/federal-register/cfr/ibr-locations.html.

    Issued in Burlington, Massachusetts, on September 17, 2010.
Robert J. Ganley,
Acting Manager, Engine and Propeller Directorate, Aircraft 
Certification Service.
[FR Doc. 2010-23833 Filed 9-24-10; 8:45 am]
BILLING CODE 4910-13-P

