[4910-13-P] 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA-2016-2859; Directorate Identifier 2016-NE-04-AD; Amendment 

39-18536; AD 2016-11-09] 

RIN 2120-AA64 

Airworthiness Directives; Turbomeca S.A. Turboshaft Engines 

AGENCY: Federal Aviation Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: We are adopting a new airworthiness directive (AD) for Turbomeca S.A. 

Arriel 1D and 1D1 turboshaft engines with a pre-modification (mod) TU357 gas 

generator module (M03 ), installed. This AD requires removing the pre-modification 

(mod) TU357 gas generator module (M03) and replacing with a part eligible for 

installation. This AD was prompted by reports of divergent rubbing between the piston 

shaft small diameter labyrinth and the rear bearing support. We are issuing this AD to 

prevent failure of the labyrinth seal and engine, in-flight shutdown, and loss of control of 

the helicopter. 

DATES: This AD becomes effective [INSERT DATE 35 DAYS AFTER DATE OF 

PUBLICATION IN THE FEDERAL REGISTER]. 

ADDRESSES: For service information identified in this final rule, contact Turbomeca 

S.A., 40220 Tamos, France; phone: 33 (0)5 59 74 40 00; fax: 33 (0)5 59 74 45 15. You 

may view this service information at the FAA, Engine & Propeller Directorate, 1200 
District A venue, Burlington, MA. For information on the availability of this material at 

the FAA, cal1781-238-7125. 

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. FAA-2016-2859; 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: Philip Haberlen, Aerospace Engineer, 

Engine Certification Office, FAA, Engine & Propeller Directorate, 1200 District A venue, 

Burlington, MA 01803; phone: 781-238-7770; fax: 781-238-7199; email: 

philip.haberlen@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Discussion 

We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 3 9 by 

adding an AD that would apply to the specified products. The NPRM was published in 

the Federal Register on March 1, 2016 (81 FR 10544). The NPRM proposed to correct 

an unsafe condition for the specified products. 

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The European Aviation Safety Agency (EASA ), which is the Technical Agent for 

the Member States of the European Community, has issued EASA AD 2016-0009, dated 

January 13, 2016 (referred to hereinafter as "the MCAI"), to correct an unsafe condition 

for the specified products. The MCAI states: 

Some cases of divergent rubbing between the piston shaft small 

diameter labyrinth and the rear bearing support have been reported. 

This condition, if not corrected, could lead to an uncommanded 

engine in-flight shutdown. 

You may obtain further information by examining the MCAI in the AD docket on 

the Internet at http://www.regulations.gov by searching for and locating Docket No. 

FAA-2016-2859. 

Comments 

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

received no comments on the NPRM (81 FR 10544, March 1, 2016). 

Conclusion 

We reviewed the available data and determined that air safety and the public 

interest require adopting this AD as proposed. 

Related Service Information 

Turbomeca S.A. has issued Mandatory Service Bulletin (MSB) No. 292 72 1357, 

Version B, dated November 12, 2015. The MSB describes procedures for installing a 

post-modification (mod) TU357 gas generator module (M03). This service information is 

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

course of business or by the means identified in the ADDRESSES section. 

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Costs of Compliance 

We estimate that this proposed AD affects 426 engines installed on helicopters of 

U.S. registry. We also estimate that it would take about 40 hours per engine to comply 

with this proposed AD. The average labor rate is $85 per hour. Required parts cost about 

$16,500 per engine. Based on these figures, we estimate the cost of this proposed AD on 

U.S. operators to be $8,477,400. 

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. 

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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 

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 § 3 9.13 by adding the following new airworthiness directive 

(AD): 

2016-11-09 Turbomeca S.A.: Amendment 39-18536; Docket No. FAA-2016-2859; 

Directorate Identifier 20 16-NE-04-AD. 

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(a) Effective Date 

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

PUBLICATION IN THE FEDERAL REGISTER]. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to all Arriel 1 D and 1 D 1 turbo shaft engines with a premodification (mod) TU357 gas generator module (M03), installed. 

(d) Reason 

This AD was prompted by reports of divergent rubbing between the piston shaft 

small diameter labyrinth and the rear bearing support. We are issuing this AD to prevent 

failure of the labyrinth seal and engine, in-flight shutdown, and loss of control of the 

helicopter. 

(e) Actions and Compliance 

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

( 1) Within 4 months or 240 engine operating hours after the effective date of this 

AD, whichever occurs later, remove the pre-modification (mod) TU357 gas generator 

module (M03) from service and replace with a part eligible for installation. 

(2) Reserved. 

(f) Alternative Methods of Compliance (AMOCs) 

The Manager, Engine Certification Office, FAA, may approve AMOCs for this 

AD. Use the procedures found in 14 CFR 3 9.19 to make your request. You may email 

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

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(g) Related Information 

(1) For more information about this AD, contact Philip Haberlen, Aerospace 

Engineer, Engine Certification Office, FAA, Engine & Propeller Directorate, 1200 

District Avenue, Burlington, MA 01803; phone: 781-238-7770; fax: 781-238-7199; 

email: philip.haberlen@faa.gov. 

(2) Refer to MCAI European Aviation Safety Agency AD 2016-0009, dated 

January 13, 2016, for more information. You may examine the MCAI in the AD docket 

on the Internet at http://www.regulations.gov by searching for and locating it in Docket 

No. FAA-2016-2859. 

(3) Turbomeca S.A. Mandatory Service Bulletin (MSB) No. 292 72 1357, 

Version B, dated November 12, 2015, which is not incorporated by reference in this AD, 

can be obtained from Turbomeca S.A., using the contact information in paragraph (g)( 4) 

of this AD. 

(4) Turbomeca S.A., 40220 Tamos, France; phone: 33 (0)5 59 74 40 00; fax: 33 

(0)5 59 74 45 15. 

(5) You may view this service information at the FAA, Engine & Propeller 

Directorate, 1200 District A venue, Burlington, MA. For information on the availability of 

this material at the FAA, call 781-238-7125. 

(h) Material Incorporated by Reference 

None. 

Issued in Burlington, Massachusetts, on May 23, 2016. 

Colleen M. D' Alessandro, 

Manager, Engine & Propeller Directorate, 

Aircraft Certification Service. 

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(g) Related Information 

(1) For more information about this AD, contact Philip Haberlen, Aerospace 

Engineer, Engine Certification Office, FAA, Engine & Propeller Directorate, 1200 

District Avenue, Burlington, MA 01803; phone: 781-238-7770; fax: 781-238-7199; 

email: philip.haberlen@faa.gov. 

(2) Refer to MCAI European Aviation Safety Agency AD 2016-0009, dated 

January 13, 2016, for more information. You may examine the MCAI in the AD docket 

on the Internet at http://www.regulations.gov by searching for and locating it in Docket 

No. FAA-2016-2859. 

(3) Turbomeca S.A. Mandatory Service Bulletin (MSB) No. 292 72 1357, 

Version B, dated November 12, 2015, which is not incorporated by reference in this AD, 

can be obtained from Turbomeca S.A., using the contact information in paragraph (g)(4) 

of this AD. 

( 4) Turbomeca S.A., 40220 Tamos, France; phone: 33 (0)5 59 74 40 00; fax: 33 

(0)5 59 74 45 15. 

( 5) You may view this service information at the FAA, Engine & Propeller 

Directorate, 1200 District Avenue, Burlington, MA. For information on the availability of 

this material at the FAA, call 781-238-7125. 

(h) Material Incorporated by Reference 

None. 

Issued in Burlington, Massachusetts, on May 23, 2016. 

Colleen M. D' Alessandro, 

Manager, Engine & Propeller Directorate, 

Aircraft Certification Service. 

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