Federal Register, Volume 75 Issue 186 (Monday, September 27, 2010)

[Federal Register Volume 75, Number 186 (Monday, September 27, 2010)]
[Rules and Regulations]
[Pages 59065-59067]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2010-23833]

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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:

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