DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

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

RIN 2120-AA64 

Ainvorthiness Directives; Turbomeca S.A. Turboshaft Engines 

AGENCY: Federal Aviation Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking (NPRM). 

[491 0-13-P) 

SUMMARY: We propose to supersede airworthiness directive (AD) 201 4-1 9-05 that 

applies to all Turbomeca S.A. Arriel I A I, l A2, 1 B, 1 C, 1 C 1, l C2, l D, l D l, I E2, l K 1, 

1 S, 1 S 1, 2 B, 20 l , 2C, 2C 1, 2C2, 2S I, and 2S2 turboshaft engines. AD 2014-19-05 

requires an initial one-time vibration check of the engine accessory gearbox (AGB) on 

certain higher risk Arriel l and Arriel 2 model engines and repetitive vibration checks for 

all Arriel 1 and AtTie I 2 engines. Since we issued AD 2014-1 9-05, we determined that a 

Technical Instruction (TI) number and a Test Bed Acceptance Test Specifications 

number in the Actions and Compliance and the Related Information sections are 

incorrect. This proposed AD would correct these numbers. We arc proposing 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: We must receive comments on this proposed AD by [INSERT DATE 60 

DAYS AFTER DATE OF PUBLICATION TN THE FEDERAL REGISTER]. 

ADDRESSES: You may send comments, using the procedures found in 14 CFR 11.43 

and 11.45, by any of the following methods: 

• Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the 

instructions for submitting comments. 
• Fax: 202-493-225 1. 

• Mail: U.S. Department ofTransportation, Docket Operations, M-30, West 

Building Ground Floor, Room W1 2-140, 1200 New Jersey Avenue SE., Washington, DC 

20590. 

• Hand Delivery: Deliver to Mai l address above between 9 a.m. and 5 p.m., 

Monday through Friday, except Federal holidays. 

For service infonnation 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 info1mation on the availability of this 

material at the FA/\, call 781-238-7125. 

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/\/\-20 14-0164; 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 proposed AD, the mandatory continuing 

airworthiness jnformation, regulatory evaluation, any comments received, and other 

information. The address for the Docket Office (phone: 800-647-5527) is in the 

ADDRESSES section. Comments will be available in the AD docket shortly after receipt. 

FOR FURTHER INFORMATION CONTACT: Mark Riley, Aerospace Engineer, 

Engine Certification Office, FAA, Engine & Propeller Directorate, I 2 New England 

Executive Park, Burlington, MA 01803; phone: 78 1-238-7758; fax: 781-238-7199; email: 

mark.riley@faa.gov. 

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SUPPLEMENTARY INFORMATION: 

Comments Invited 

We invite you to send any written relevant data, views, or arguments about this 

proposed AD. Send your comments to an address listed under the ADDRESSES section. 

Include "Docket No. FAA-2014-0164; Directorate Identifier 2014-NE-02-AD" at the 

beginning of your comments. We specifically invite comments on the overall regulatory, 

economic, environmental, and energy aspects of this proposed AD. We will consider all 

comments received by the closing date and may amend this proposed AD because of 

those comments. 

We will post all comments we receive, without change, to 

http://www.regulations.gov, including any personal information you provide. We will 

also post a report summarizing each substantive verbal contact we receive about this 

proposed AD. 

Discussion 

On September 15, 2014, we issued AD 2014-19-05, Amendment 39-17973 (79 

FR59091,0ctober 1,2014), forallTurbomecaS.A.Arriel iAl, 1A2, 18, IC, lCl, 1C2, 

lD, I 0 1, 1E2, l KI, IS, IS 1, 2B, 2B I, 2C, 2C1, 2C2, 2S I, and 2S2 turboshaft engines. 

AD 2014-19-05 requires an initial one-time vibration check ofthe engine AGB on certain 

higher risk Arriel 1 and Arriel 2 model engines. AD 2014-19-05 also requires repetitive 

vibration checks of the engine AGB for all Arriel 1 and Arricl 2 engines at every engine 

shop visit. AD 2014- 19-05 resulted from reports of uncommanded in-·flight shutdowns on 

Turbomeca S.A. Arriel 1 and Arriel 2 engines, following rupture of the 41-tooth gear 

forming prut of the 41 /23-tooth bevel gear located in the engine AGB. We issued AD 

2014-19-05 to prevent fai lure of the engine AGB, whi ch could lead to in-flight shutdown 

and damage to the engine, which may result in damage to the aircraft. 

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Actions Since AO 2014-19-05 Was Issued 

Since we issued AD 2014-19-05, Amendment 39-17973 (79 FR 59091 , October 

1, 20 14), we determined that a TJ number and a Test Bed Acceptance Test Specifications 

number in the Actions and Compliance and the Related Information sections are 

incorrect. This proposed AD would correct these numbers. 

Relevant Sen rice Information 

We reviewed Turbomeca S.A Mandatory Service Bulletin (MSB) No. 292 72 

0839, Version B, dated November 25, 201 3, and MSB No. 292 72 2849, Version B, dated 

November 25, 20 13. The service information describes procedures for performing 

vibration checks of the engine AGB. 

FAA's Determination 

We are proposing this AD because we evaluated all the relevant information and 

determined the unsafe condition described previously is likely to exist or develop in other 

products of the same type design. 

Proposed AD Requirements 

This proposed AD would require an initial one-time vibration check of the engine 

AGB on certain higher risk Arriel I and Arriel 2 model engines. This AD also requires 

repetitive vibration checks of the engine AGB for all Arriel 1 and Arri el 2 engines at 

every engine shop visit. 

Costs of Compliance 

We estimate that this proposed AD would affect I ,268 engines installed on 

aircraft of U.S. registry. We also estimate that it would take about 4 hours per engine to 

comply with the inspection requirement in this proposed AD. The average labor rate is 

$85 per hour. Based on these figures, we estimate the cost of this proposed AD on U.S. 

operators to be $43 1,120. 

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Authority for this Rulcmaking 

Title 49 of the United States Code specifies the FAA's authority to issue rules on 

aviation safety. Subtitle I, Section l 06, 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 Vll, 

Part A, Subpart III, Section 44 70 I, "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 have determined that this proposed AD would not have federalism 

implications under Executive Order 13132. This proposed AD would 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 the proposed regulation: 

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

(2) Is not a "sit,'llificant rule" under the DOT Regulatory Policies and Procedures 

(44 FR 11034, February 26, 1979), 

(3) Wi II 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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List of Subjects in 14 CFR Part 39 

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

The Proposed Amendment 

Accordingly, under the authority delegated to me by the Administrator, the fAA 

proposes to amend 14 CFR part 39 as follows: 

PART 39 -AIRWORTHINESS DIRECTIVES 

I. The authority citation for part 39 continues to read as fo llows: 

Authority: 49 U.S.C. I06(g), 40113, 44701. 

§ 39.13 [Amendedj 

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

2014-19-05, Amendment 39-17973 (79 FR 5909I, October I, 20 14), and adding the 

following new AD: 

T urbomeca S.A.: Docket No. F AA-20 14-0 164; Directorate Identifier 20 14-NE-02-AD. 

(a) Comments Due Date 

We must receive comments by [INSERT DATE 60 DAYS AFTER DATE OF 

PUBLICATION IN THE FEDERAL REGISTER]. 

(b) Affected ADs 

This AD supersedes AD 20 14-19-05, Amendment 39-17973 (79 FR 5909I , 

October 1, 2014). 

(c) Applicability 

This AD applies to all Turbomeca S.A. Arriel tAl , lA2, lB, 1C, ICl , IC2, 10, 

1 0 I, 1 E2, I K l, 1 S, IS I, 2B, 2B I, 2C, 2C 1, 2C2, 2S I, and 2S2 turboshaft engines. 

(d) U nsafc Condition 

This AD was prompted by reports of uncommanded in-flight shutdowns on 

Turbomeca S.A. Aniel I and Arriel 2 engines following mpture of the 41-tooth gear 

fonning part of the 41 /23-tooth bevel gear located in the engine accessory gearbox 

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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. 

( I) For all Turbomeca S.A. Arriel I B, I 0 , I D I, 28, and 28 I turbos haft engines, 

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

32 months of the effective elate ofthjs AD, as follows: 

(i) For all Turbomeca S.A. Aniel I B, I D, and 1 D I engines, except those engines 

with an AGB install ed with a serial number (S/N) listed in Figure I ofTurbomeca S.A. 

Mandatory Service Bulletin (MSB) No. 292 72 0839, Version B, dated November 25, 

2013, use paragraphs 6.A. through 6.C. ofTurbomeca 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. Aniel l Technical Instruction (Tl) No. 

292 72 0839, Version E, dated f ebruary 20, 2014, and Turbomeca S.A. Arriel 1 TJ No. 

292 72 0840, Version A, dated November 29,2013, which you must also use to do the 

vibration check. 

(ii) The reporting requirements in paragraphs 6.A.(I)(c), 6.A.(2)(b), and 

6.B.(l)(c) and the requirement to return module MOl in paragraph 6.B.(2)(b).f. of 

Turbomeca S.A. MSB No. 292 72 0839, Version 8 , dated November 25, 2013, are not 

required by this AD. 

(iii) For all Turbomeca S.A. Arricl 28 and 281 engines, except those engines with 

an AGB installed with an SIN listed in Figure 1 ofTurbomeca MSB No. 292 72 2849, 

Version B, dated November 25, 20 13, usc paragraphs 6.A. through 6.C. ofTurbomeca 

S.A. MS8 No. 292 72 2849, Version 8, dated November 25, 2013, to perform the 

vibration check. Turbomeca S.A. MSB No. 292 72 2849 refers to Turbomeca S.A. 

Aniel 2 Tl No. 292 72 2849, Version E, elated February 20, 2014, and Turbomeca S.A. 

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Arriel 2 TT 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.(I)(c), 6.A.(2)(b), and 

6.B.(l)(c), and the requirement to return module MOl in paragraph 6.8.(2)(b)~ 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 ofthis AD, perform a vibration check of the AGB 41/23-tooth bevel 

gear meshing. 

(3) Tfthe AGB 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 AG B before the effective date of this 

AD using Turbomeca S.A. MSB No. 292 72 0839, Version A, dated September 9, 20 13; 

or MSB No. 292 72 2849, Version A, dated September 9, 20 13, or during an engine shop 

visit per paragraph (e)(2) of this AD, you met the initial inspection requirement of 

paragraph (e)(l) 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 transpottation without 

subsequent engine maintenance does not constit11te 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 39.1 9 to make your request. You may email 

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

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(i) Related Information 

(I) 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 0 1803; phone: 781- 238-7758; fax: 781 - 238-7199; 

email: mark.riley@faa.gov. 

(2) Refer to MCAI European Aviation Safety Agency AD 201 4-0036, dated 

February II , 2014, for re lated information. You may examine the MCAI in the AD 

docket on the Internet at http://www.regulations.gov/#!documentDetaii;D=F AA-20 14-

0164-0003. 

(3) Turbomeca S.A. MSB No. 292 72 0839, Version B, dated November 25, 

2013; and MSB No. 292 72 2849, Version B, dated November 25, 2013, provide 

guidance on performing the one-time vibration check. Arriel I Technical Instruction (TI) 

No. 292 72 0839, Version E, dated February 20 14; Arriel I TJ No. 292 72 0840, Version 

A, dated November 29, 2013; Arriel 2 TI No. 292 72 2849, Version E, dated February 20, 

20 14; and AtTie I 2 Tl No. 292 72 2850, Version A, dated November 29, 20 13, provide 

detailed instructions on performing the one-time vibration check for At-riel I and Arriel 2 

engines as indicated. Turbomeca Engine Test Bed Acceptance Test Specifications CCT 

No. 0292009400, Version T; CCT No. 02920 19400, Version R; CCT No. 0292019690, 

Version I; CCT No. 02920 19530, Version K; CCT No. 02920 19610, 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 information on performing a 

vibration check during an engine shop visit. These service documents, which are not 

incorporated by reference in this AD, can be obtained from Turbomeca S.A. using the 

contact information in paragraph (i)(4) of this proposed AD. 

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(4) For service information identified in this proposed AD, contact Turbomeca 

S.A., 40220 Tarnos, France; phone: 33 0 5 59 74 40 00; te lex: 570 042; fax: 33 0 5 59 74 

45 15. 

(5) 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. 

Issued in Burl ington, Massachusetts, on January 26, 2015. 

Colleen M. D'Aicssandro, 

Assistant Directorate Manager, Engine & Propeller Directorate, 

Aircraft Certification Service. 

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