[Docket No. FAA-2014-0164; Directorate Identifier 2014-NE-02-AD; Amendment 

39-18191; AD 2015-13-04] 

RIN 2120-AA64 

Airworthiness Directives; Turbomeca S.A. Turboshaft Engines AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Final rule. 

SUMMARY: We are superseding airworthiness directive (AD) 2014-19-05 for all 

TuTbomeca S.A. Arriel 1 A 1, 1A2, lB, lC, lCl, 1 C2, 10, 1D1, 1E2, 1 KJ, 1 S, 1 Sl, 2B, 

2Bl, 2C, 2Cl, 2C2, 2S1, and 2S2 turboshaft engines. AD 2014-19-05 required an initial 

one-time vibration check ofthe engine accessory gearbox (AGB) on certain Arriel 1 and 

Arriel 2 model engines, and repetitive vibration checks for all Arriel 1 and Arriel 2 

engines. This AD was prompted by our determination that we incorrectly identified 

technical references in AD 2014-19-05. We are issuing this AD to prevent failure ofthe 

engine AGB, which could lead to in-flight shutdown and dan1age to the engine, which 

may result in damage to the aircraft. 

DATES: This AD is effective [INSERT DATE 35 OA YS AFTER DATE OF 

PUBLICATION IN THE FEDERAL REGISTER]. 
certain other publications listed in this AD as ofNovember 5, 2014 (79 FR 59091, 

October 1, 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 781-23 8-7125. It is also available on the Internet at 

http://www.regulations.gov by searching for and locating Docket No. FAA-2014-0164. 

Examining the AD Docket 

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

searching for and locating Docket No. F AA-20 14-0 164; 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, 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 

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

supersede AD 2014-19-05, Amendment 39-17973 (79 FR 59091, October 1, 2014), ("AD 

20 14-19-05"). AD 2014-19-05 applied to the specified products. The NPRM published in 

the Federal Register on February 4, 2015 (80 FR 6017). The NPRM proposed to continue 

to require an initial one-time vibration check of the engine AGB on certain higher risk 

Arriel 1 and Arriel 2 model engines. That NPRM also proposed to continue to require 

repetitive vibration checks ofthe engine AGB for all Arriel 1 and Arriel 2 engines at 

every engine shop visit. 

We gave the public the opportunity to participate in developing this AD. We 

considered the comments received. 

Request to Allow Sufficient Compliance Time 

One commenter requested that sufficient time be allowed to comply with this AD 

to account for the availability of the vibration test equipment and Turbomeca technical 

representatives. The commenter indicated that the initial one-time vibration check of the 

engine AGB requires use ofTurbomeca-specified vibration test equipment and is 

performed by Turbomeca technical personnel. 

We do not agree. The compliance times in the AD provide sufficient time for the 

operator to perform the required maintenance. Operators can also procure the required 

vibration test equipment to perform the test. We did not change this AD. 

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is when the engine is "overhauled or repaired in a qualified Repair Center." The 

commenter indicated that because ofthe modularity of the Arriel engine, it is possible to 

separate a major mating flange during "Level 2" or "Level 1 maintenance." 

We do not agree. We do not find specific criteria in EASA AD 2014-0036's 

definition of"engine shop visit" for when the repetitive AGB vibration check should be 

conducted. We did not change this AD. 

Request to Eliminate Repetitive Vibration Check 

One commenter requested that the repetitive vibration check required by this AD 

be eliminated. The commenter indicated that this vibration check is already incorporated 

in Turbomeca Level 4 maintenance, and in subsequent test requirements, so it will always 

be done. Further, adding this requirement to the AD only adds to the cost and paperwork 

requirements for operators. 

We do not agree. The repetitive vibration checks of the engine AGB are required 

to prevent failure of the AGB. We did not change this AD. 

Revisions to Service Information References 

Turbomeca S.A. updated the service bulletins (SBs) referenced in this AD. We 

reviewed the updated SBs and found they adequately addressed the unsafe condition. 

Therefore, we revised this AD to reference the updated versions of the SBs. This AD now 

references Turbomeca S.A. Mandatory Service Bulletin (MSB) No. 292 72 0839, Version 

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We reviewed the available data, including the comments received, and determined 

that air safety and the public interest require adopting this AD with the changes described 

previously. We determined that these changes will not increase the economic burden on 

any operator or increase the scope of this AD. 

Related Service Information under 1 CFR part 51 

We reviewed Turbomeca S.A. MSB No. 292 72 0839, Version C, dated June 18, 

2014; and Turbomeca S.A. MSB No. 292 72 2849, Version C, dated June 18,2014. The 

service information describes procedures for vibration checks. This service information is 

reasonably available because the interested parties have access to it through their normal 

course ofbusiness or by the means identified in the ADDRESSES section of this AD. 

Costs of Compliance 

We estimate that this AD affects 1,268 engines installed on aircraft ofU.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. 

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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 rulemak:ing action. 

Regulatory Findings 

This AD will not have federalism implications tmder 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 that this AD: 

(1) Is not a "significant regulatory action" under Executive Order 12866, 

(2) Is not a "significant rule" under 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. 

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amends part 39 of the Federal Aviation Regulations (14 CFR part 39) as follows: 

PART 39- AIRWORTHINESS DIRECTIVES 

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

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

§ 39.13 [Amended] 

2. The FAA amends§ 39.13 by removing airworthiness directive (AD) 2014-19-

05, Amendment 39-17973 (79 FR 59091, October 1, 2014), and adding the following 

new AD: 

2015-13-04 Turbomeca S.A.: Amendment 39-18191; Docket No. FAA-2014-0164; 

Directorate Identifier 2014-NE-02-AD. 

(a) Effective Date 

This AD is effective [INSERT DATE 35 DAYS AFTER DATE OF 

PUBLICATION IN THE FEDERAL REGISTER]. 

(b) Affected ADs 

Tllis AD supersedes AD 2014-19-05, Amendment 39-17973 (79 FR 59091, 

October 1, 2014). 

(c) Applicability 

This AD applies to all Turbomeca S.A. Aniel l A 1, 1 A2, 1 B, 1 C, 1 C 1, 1 C2, 1 D, 

lDl, 1E2, 1Kl, IS, lSI, 2B, 2Bl, 2C, 2C1, 2C2, 2S1, and 2S2 turboshaft engines. 

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(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) Compliance 

Comply with this AD within the compliance times specified, unless already done. 

(1) For all Turbomeca S.A. Arriel IB, ID, IDI, 2B, and 2B 1 turboshaft engines, 

perform a one-time vibration check of the AGB 41/23-tooth bevel gear meshing within 

32 months of the effective date ofthis AD, as follows: 

(i) For all Turbomeca S.A. Arriel IB, ID, and lDl engines, except those engines 

with an AGB installed with a serial number (SIN) listed in the figure under paragraph 2.2. 

ofTurbomeca S.A. Mandatory Service Bulletin (MSB) No. 292 72 0839, Version C, 

dated June 18,2014, use paragraph 2.3.1. through 2.3.3. ofTurbomeca S.A. MSB No. 

292 72 0839, Version C, dated June 18,2014, to perform the vibration check. 

(ii) You must also use Turbomeca S.A. ArTiel I Technical Instruction (Tl) No. 

292 72 0839 and Turbomeca S.A. Arriel I TI No. 292 72 0840 to do the vibration check. 

(iii) For all Turbomeca S.A. Arriel2B and 2Bl engines, except those engines with 

an AGB installed with an SIN listed in the figure under paragraph 2.2. ofTurbomeca S.A. 

MSB No. 292 72 2849, Version C, dated June 18,2014, use paragraphs 2.3.1. through 

2.3.3. ofTurbomeca S.A. MSB No. 292 72 2849, Version C, dated June 18, 2014, 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 and to Turbomeca S.A. Arriel 2 TI No. 292 72 2850, 

which you must also use to do the vibration check. 

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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. 

(3) If the 1\GB does not pass the vibration check required by paragraphs (e)(l) 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 Version B, dated November 25,2013, or MSB No. 292 72 2849, Version A, dated 

September 9, 20 13, or Version B, dated November 25, 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 for this 

AD. Use the procedures found in 14 CFR 39.19 to make your request. You may email 

your request to: ANE-AD-AMOC@faa.gov. 

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mark.riley@faa.gov. 

(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 http://www.regulations.gov/#!documentDetail;D=FAA-2014-

0164-0003. 

(3) Turbomeca S.A. Engine Test Bed Acceptance Test Specifications CCT No. 

0292009400, Version T; CCT No. 0292019400, Version R; CCT No. 0292019690, 

Version I; CCTNo. 0292019530, Version K; CCTNo. 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, provide infonnation on performing a 

vibration check during an engine shop visit. These service documents can be obtained 

from Turbomeca S.A. using the contact information in paragraph (j)(5) of this AD. 

(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. 

(3) The following service information was approved for IBR on [INSERT DATE 

35 DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER]. 

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20 14 (79 FR 59091, October 1, 2014). 

2013. 

(i) Turbomeca S.A. 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, 

(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 

29,20 13. 

(5) 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. 

(6) You may view this service infomtation at FAA, Engine & Propeller 

Directorate, 12 New England Executive Park, Burlington, MA. For information on the 

availability ofthis material at the FAA. call781-238-7125. 

(7) 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: http://www.archivcs.gov/federal-register/cfr/ibrlocations.html. 

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