AD 2014-19-05
Recurring
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Turbomeca | S | Airworthiness Directives; Turbomeca S.A. Turboshaft Engines |
Unsafe Condition
Reports of uncommanded in-flight shutdowns on Turbomeca S.A. Arriel 1 and Arriel 2 engines following rupture of the 41-tooth gear forming the 41/23-tooth bevel gear located in the engine accessory gearbox (AGB).
Required Actions
Perform a one-time vibration check of the AGB 41/23-tooth bevel gear meshing within 32 months of the effective date of this AD, and perform a vibration check of the AGB 41/23-tooth bevel gear meshing during each engine shop visit after the effective date of this AD. If the AGB does not pass the vibration check, replace the AGB with a part eligible for installation.
Compliance Time
Within 32 months of the effective date of this AD
Affected Aircraft
All Turbomeca S.A. Arriel 1A1, 1A2, 1B, 1C, 1C1, 1C2, 1D, 1D1, 1E2, 1K1, 1S, 1S1, 2B, 2B1, 2C, 2C1, 2C2, 2S1, and 2S2 turboshaft engines.
Federal Register Abstract
We are adopting a new airworthiness directive (AD) for all Turbomeca S.A. Arriel 1A1, 1A2, 1B, 1C, 1C1, 1C2, 1D, 1D1, 1E2, 1K1, 1S, 1S1, 2B, 2B1, 2C, 2C1, 2C2, 2S1, and 2S2 turboshaft engines. This AD requires an initial one-time vibration check of the engine accessory gearbox (AGB) on certain higher risk Arriel 1 and Arriel 2 model engines. This AD also requires repetitive vibration checks of the engine AGB for all Arriel 1 and Arriel 2 engines at every engine shop visit. This AD was prompted by reports of uncommanded in-flight shutdowns on Turbomeca S.A. Arriel 1 and Arriel 2 engines following rupture of the 41-tooth gear forming part of the 41/23-tooth bevel gear located in the engine AGB. We are issuing this AD to prevent failure of the engine AGB, which could lead to in-flight shutdown and damage to the engine, which may result in damage to the aircraft.
Applicability Source Text
Show captured applicability text from the source AD
(c) Applicability
This AD applies to all Turbomeca S.A. Arriel 1A1, 1A2, 1B, 1C,
1C1, 1C2, 1D, 1D1, 1E2, 1K1, 1S, 1S1, 2B, 2B1, 2C, 2C1, 2C2, 2S1,
and 2S2 turboshaft engines.
Document Text
Show stored source text (verify against official source)
[Federal Register Volume 79, Number 190 (Wednesday, October 1, 2014)]
[Rules and Regulations]
[Pages 59091-59093]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2014-23353]
=======================================================================
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2014-0164; Directorate Identifier 2014-NE-02-AD;
Amendment 39-17973; AD 2014-19-05]
RIN 2120-AA64
Airworthiness Directives; Turbomeca S.A. Turboshaft Engines
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule.
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SUMMARY: We are adopting a new airworthiness directive (AD) for all
Turbomeca S.A. Arriel 1A1, 1A2, 1B, 1C, 1C1, 1C2, 1D, 1D1, 1E2, 1K1,
1S, 1S1, 2B, 2B1, 2C, 2C1, 2C2, 2S1, and 2S2 turboshaft engines. This
AD requires an initial one-time vibration check of the engine accessory
gearbox (AGB) on certain higher risk Arriel 1 and Arriel 2 model
engines. This AD also requires repetitive vibration checks of the
engine AGB for all Arriel 1 and Arriel 2 engines at every engine shop
visit. This AD was prompted by reports of uncommanded in-flight
shutdowns on Turbomeca S.A. Arriel 1 and Arriel 2 engines following
rupture of the 41-tooth gear forming part of the 41/23-tooth bevel gear
located in the engine AGB. We are issuing this AD to prevent failure of
the engine AGB, which could lead to in-flight shutdown and damage to
the engine, which may result in damage to the aircraft.
DATES: This AD becomes effective November 5, 2014.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in this AD as of November 5,
2014.
ADDRESSES: For service information identified in this AD, contact
Turbomeca, S.A., 40220 Tarnos, France; phone: 33 (0)5 59 74 40 00;
telex: 570 042; fax: 33 (0)5 59 74 45 15. You may view this service
information at the FAA, Engine & Propeller Directorate, 12 New England
Executive Park, Burlington, MA. For information on the availability of
this material at the FAA, call 781-238-7125.
Examining the AD Docket
You may examine the AD docket on the Internet at <a href="http://www.regulations.gov">http://www.regulations.gov</a> by searching for and locating Docket No. FAA-2014-
0164; or in person at the Docket Management Facility between 9 a.m. and
5 p.m., Monday through Friday, except Federal holidays. The AD docket
contains this AD, the mandatory continuing airworthiness information
(MCAI), the regulatory evaluation, any comments received, and other
information. The address for the Docket Office (phone: 800-647-5527) is
Document Management Facility, U.S. Department of Transportation, Docket
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New
Jersey Avenue SE., Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT: Mark Riley, Aerospace Engineer, Engine
Certification Office, FAA, Engine & Propeller Directorate, 12 New
England Executive Park, Burlington, MA 01803; phone: 781-238-7758; fax:
781-238-7199; email: <a href="/cdn-cgi/l/email-protection#9ff2feedf4b1edf6f3fae6dff9fefeb1f8f0e9"><span class="__cf_email__" data-cfemail="8be6eaf9e0a5f9e2e7eef2cbedeaeaa5ece4fd">[email protected]</span></a>.
SUPPLEMENTARY INFORMATION:
Discussion
We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR
part 39 by adding an AD that would apply to the specified products. The
NPRM was published in the Federal Register on June 4, 2014 (79 FR
32195).
[[Page 59092]]
The NPRM proposed to correct an unsafe condition for the specified
products. This AD results from an MCAI originated by an aviation
authority of another country to identify and correct an unsafe
condition on an aviation product. The MCAI states:
Several cases of uncommanded in-flight shut-down (IFSD) have
been reported on ARRIEL 1 or ARRIEL 2 engines following rupture of
the 41-tooth gear forming part of the 41/23 tooth bevel gear located
in the accessory gearbox (AGB) within engine module M01.
Results of subsequent investigations showed that the meshing
quality of the bevel gear may have contributed to tooth rupture.
The rupture of the AGB 41-tooth gear may lead to loss of driving
of equipment essential to engine operation.
This condition if not detected and corrected, could lead to an
uncommanded engine in-flight shut-down and may ultimately lead to an
emergency landing.
Comments
We gave the public the opportunity to participate in developing
this AD. We considered the comment received.
Request To Provide Sufficient Compliance Time
One commenter requested that we provide sufficient time to comply
with the AD. The commenter indicated that special tooling, to be
supplied by Turbomeca, is necessary to comply with the AD. The
vibration check itself is also performed by Turbomeca representatives.
We do not agree. Our analysis has confirmed that 32 months is
sufficient time for operators to complete the actions required by this
AD. We did not change this AD.
Conclusion
We reviewed the available data, including the comment received, and
determined that air safety and the public interest require adopting
this AD as proposed.
Costs of Compliance
We estimate that this AD affects 1,268 engines installed on
aircraft of U.S. registry. We also estimate that it will take about 4
hours per engine to comply with the inspection requirement in this AD.
The average labor rate is $85 per hour. Based on these figures, we
estimate the cost of this AD on U.S. operators to be $431,120.
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),
(3) Will not affect intrastate aviation in Alaska to the extent
that it justifies making a regulatory distinction, and
(4) 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.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by
reference, Safety.
Adoption of the Amendment
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 adding the following new airworthiness
directive (AD):
2014-19-05 Turbomeca S.A.: Amendment 39-17973; Docket No. FAA-2014-
0164; Directorate Identifier 2014-NE-02-AD.
(a) Effective Date
This AD becomes effective November 5, 2014.
(b) Affected ADs
None.
(c) Applicability
This AD applies to all Turbomeca S.A. Arriel 1A1, 1A2, 1B, 1C,
1C1, 1C2, 1D, 1D1, 1E2, 1K1, 1S, 1S1, 2B, 2B1, 2C, 2C1, 2C2, 2S1,
and 2S2 turboshaft engines.
(d) Reason
This AD was prompted by reports of uncommanded in-flight
shutdowns on Turbomeca S.A. Arriel 1 and Arriel 2 engines following
rupture of the 41-tooth gear forming the 41/23-tooth bevel gear
located in the engine accessory gearbox (AGB). We are issuing this
AD to prevent failure of the engine AGB, which could lead to in-
flight shutdown and damage to the engine, which may result in damage
to the aircraft.
(e) Actions and Compliance
Unless already done, do the following.
(1) For all Turbomeca S.A. Arriel 1B, 1D, 1D1, 2B, and 2B1
turboshaft engines, perform a one-time vibration check of the AGB
41/23-tooth bevel gear meshing within 32 months of the effective
date of this AD, as follows:
(i) For all Turbomeca S.A. Arriel 1B, 1D, and 1D1 engines,
except those engines with an AGB installed with a serial number (S/
N) listed in Figure 1 of Turbomeca S.A. Mandatory Service Bulletin
(MSB) No. 292 72 0839, Version B, dated November 25, 2013, use
paragraphs 6.A. through 6.C. of Turbomeca S.A. MSB No. 292 72 0839,
Version B, dated November 25, 2013, to perform the vibration check.
Turbomeca S.A. MSB No. 292 72 0839 refers to Turbomeca S.A. Arriel 1
Technical Instruction (TI) No. 292 72 0839, Version E, dated
February 20, 2014, and Turbomeca S.A. Arriel 1 TI No. 292 72 8,
Version A, dated November 29, 2013, which you must also use to do
the vibration check.
(ii) The reporting requirements in paragraphs 6.A.(1)(c),
6.A.(2)(b), and 6.B.(1)(c) and the requirement to return module M01
in paragraph 6.B.(2)(b)2 of Turbomeca S.A. MSB No. 292 72 0839,
Version B, dated November 25, 2013, are not required by this AD.
(iii) For all Turbomeca S.A. Arriel 2B and 2B1 engines, except
those engines with an AGB installed with an S/N listed in Figure 1
of Turbomeca MSB No. 292 72 2849, Version B, dated November 25,
2013, use paragraphs 6.A. through 6.C. of Turbomeca S.A. MSB No. 292
72 2849, Version B, dated November 25, 2013, to perform the
vibration check. Turbomeca S.A. MSB No. 292 72 2849 refers to
Turbomeca S.A. Arriel 2 TI No. 292 72 2849, Version E, dated
February 20, 2014, and Turbomeca S.A. Arriel 2 TI No. 292 72 2850,
Version A, dated November 29, 2013, which you must also use to do
the vibration check.
(iv) The reporting requirements in paragraphs 6.A.(1)(c),
6.A.(2)(b), and
[[Page 59093]]
6.B.(1)(c), and the requirement to return module M01 in paragraph
6.B.(2)(b)2 of Turbomeca S.A. MSB No. 292 72 2849, Version B, dated
November 25, 2013, are not required by this AD.
(2) For all affected Turbomeca S.A. engines, during each engine
shop visit after the effective date of this AD, perform a vibration
check of the AGB 41/23-tooth bevel gear meshing. Guidance on
performing the vibration check during an engine shop visit can be
found in the service information listed in paragraph (i)(3) in the
Related Information section.
(3) If the AGB does not pass the vibration check required by
paragraphs (e)(1) or (e)(2) of this AD, replace the AGB with a part
eligible for installation.
(f) Credit for Previous Action
If you performed a vibration check of the AGB before the
effective date of this AD using Turbomeca S.A. MSB No. 292 72 0839,
Version A, dated September 9, 2013; or MSB No. 292 72 2849, Version
A, dated September 9, 2013, or during an engine shop visit per
paragraph (e)(2) of this AD, you met the initial inspection
requirement of paragraph (e)(1) of this AD.
(g) Definition
For the purpose of this AD, an ``engine shop visit'' is the
induction of an engine into the shop for maintenance involving the
separation of pairs of major mating engine flanges. The separation
of engine flanges solely for the purpose of transportation without
subsequent engine maintenance does not constitute an engine shop
visit.
(h) Alternative Methods of Compliance (AMOCs)
The Manager, Engine Certification Office, FAA, may approve AMOCs
to this AD. Use the procedures found in 14 CFR 39.19 to make your
request.
(i) Related Information
(1) For more information about this AD, contact Mark Riley,
Aerospace Engineer, Engine Certification Office, FAA, Engine &
Propeller Directorate, 12 New England Executive Park, Burlington, MA
01803; phone: 781-238-7758; fax: 781-238-7199; email:
<a href="/cdn-cgi/l/email-protection#d8b5b9aab3f6aab1b4bda198beb9b9f6bfb7ae"><span class="__cf_email__" data-cfemail="a9c4c8dbc287dbc0c5ccd0e9cfc8c887cec6df">[email protected]</span></a>.
(2) Refer to MCAI European Aviation Safety Agency AD 2014-0036,
dated February 11, 2014, for related information. You may examine
the MCAI in the AD docket on the Internet at <a href="http://www.regulations.gov/#!docketDetail">http://www.regulations.gov/#!docketDetail</a>;D=FAA-2014-0164.
(3) Turbomeca Engine Test Bed Acceptance Test Specifications CCT
No. 0292009400, Version T; CCT No. 0292019400, Version R; CCT No.
0292019690, Version I; CCT No. 029201530, Version K; CCT No.
0292019610, Version K; CCT No. 0292029450, Version J; CCT No.
0292029490, Version I; CCT No. 0292029440, Version I; CCT No.
0292029480, Version K; CCT No. 0292029520, Version H; CCT No.
0292029410, Version L; CCT No. 0292029530, Version H; or Turbomeca
ID No. 383952; or Turbomeca RTD No. X 292 65 327 2, which are not
incorporated by reference in this AD, can be obtained from Turbomeca
S.A., using the contact information in paragraph (j)(3) of this AD.
This service information provides guidance on performing the
vibration check during an engine shop visit.
(j) Material Incorporated by Reference
(1) The Director of the Federal Register approved the
incorporation by reference (IBR) of the service information listed
in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51.
(2) You must use this service information as applicable to do
the actions required by this AD, unless the AD specifies otherwise.
(i) Turbomeca S.A. Mandatory Service Bulletin (MSB) No. 292 72
0839, Version B, dated November 25, 2013.
(ii) Turbomeca S.A. MSB No. 292 72 2849, Version B, dated
November 25, 2013.
(iii) Turbomeca S.A. Arriel 1 Technical Instruction (TI) No. 292
72 0839, Version E, dated February 20, 2014.
(iv) Turbomeca S.A. Arriel 1 TI No. 292 72 0840, Version A,
dated November 29, 2013.
(v) Turbomeca S.A. Arriel 2 TI No. 292 72 2849, Version E, dated
February 20, 2014.
(vi) Turbomeca S.A. Arriel 2 TI No. 292 72 2850, Version A,
dated November 29, 2013.
(3) For Turbomeca S.A. service information identified in this
AD, contact Turbomeca, S.A., 40220 Tarnos, France; phone: 33 (0)5 59
74 40 00; telex: 570 042; fax: 33 (0)5 59 74 45 15.
(4) You may view this service information at FAA, Engine &
Propeller Directorate, 12 New England Executive Park, Burlington,
MA. For information on the availability of this material at the FAA,
call 781-238-7125.
(5) You may view this service information 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:
<a href="http://www.archives.gov/federal-register/cfr/ibr-locations.html">http://www.archives.gov/federal-register/cfr/ibr-locations.html</a>.
Issued in Burlington, Massachusetts, on September 15, 2014.
Colleen M. D'Alessandro,
Assistant Directorate Manager, Engine & Propeller Directorate, Aircraft
Certification Service.
[FR Doc. 2014-23353 Filed 9-30-14; 8:45 am]
BILLING CODE 4910-13-P
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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