[4910-13-P] 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA-2015-4070; Directorate Identifier 2015-NE-31-AD; Amendment 

39-18408; AD 2016-04-14] 

RIN 2120-AA64 

Ainvorthiness 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 certain 

Turbomeca S.A. Arriel 1 E2 turboshaft engines. This AD requires removing the 

tachometer box on affected engines. This AD was prompted by reports of uncommanded 

in-flight shutdowns (IFSDs). We are issuing this AD to prevent failure of the tachometer 

box, which could lead to failure of the engine, IFSD, and loss of control of the helicopter. 

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

PUBLICATION JN THE FEDERAL REGISTER]. 

ADDRESSES: For service information identified in this AD, contact Turbomeca S.A., 

40220 Tarnos, 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, 

call 781-238-7125. It is also available on the Internet at http://www.regulations.gov by 

searching for and locating Docket No. F AA-20 15-4070. 
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 15-4070; 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 ofTransportation, Docket Operations, M-30, 

West Building Ground Floor, Room Wl2-l40, 1200 New Jersey Avenue SE., 

Washington, DC 20590. 

FOR FURTHER INFORMATION CONTACT: Philip Haberl en, 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. 

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 November 24,2015 (80 FR 73147). The NPRM proposed to 

correct an unsafe condition for the specified products. The MCAI states: 

There have been reports of Arriel 1 E2 engines having experienced 

an uncommanded in-flight shut-down (IFSD) due to an untimely 

activation of the tachometer box shut-off system which was 

activated by the power turbine monitoring function of the 

tachometer box. 

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This condition, if not corrected, could potentially lead to further 

cases of IFSD, possibly resulting in a forced landing. 

Comments 

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

received no comments on the NPRM (80 FR 73147, November 24, 2015). 

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 No. 292 77 0844, Version 

B, dated July 6, 2015. The service information describes procedures for removing 

pre-TU 369 tachometer boxes. 

Costs of Compliance 

We estimate that this AD affects 200 engines installed on helicopters of U.S. 

registry. We also estimate that it will take about 3 hours per engine to comply with this 

AD. The average labor rate is $85 per hour. Based on these figures, we estimate the cost 

ofthis AD on U.S. operators to be $51,000. 

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 ofthe FAA Administrator. 

"Subtitle VII: Aviation Programs," describes in more detail the scope of the Agency's 

authority. 

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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 fmds 

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 eiTect 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, l 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. 

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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- AIRWORTIDNESS 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 adding the following new airworthiness directive 

(AD): 

2016-04-14 Turbomeca S.A.: Amendment 39-18408; Docket No. FAA-2015-4070; 

Directorate Identifier 2015-NE-31-AD. 

(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 

(1) This AD applies to Turbomeca S.A. Arriel 1E2 turboshaft engines with 

tachometer boxes with the following part number (PIN) and serial number (SIN) 

combinations: 

(i) PIN 95801 16170- all SINs 

(ii) PIN 95801 16260 - all SINs 

(iii) PIN 9580116900 - all SINs 

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(iv) PIN 95801171 10- all SINs 

(v) PIN 95801 17550- all SINs 1499 and below with or without suffix letters and 

all SINs 1500 and above that do not contain the suffix letters EL. 

(2) This AD applies only to Turbomeca S.A. Arriel 1E2 turboshaft engines with 

tachometer boxes identified in paragraph (c)(1) of this AD that also have installed 

electrical connectors labeled as Pl0106, P10098, and Pl0108; or PllF, P13F, and P15F. 

(d) Reason 

This AD was prompted by reports ofuncommanded in-flight shutdowns (IFSDs). 

We are issuing this AD to prevent failure of the tachometer box, which could lead to 

failure of the engine, IFSD, 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 1 ,600 flight hours after the effective date of this AD, remove the 

affected tachometer box from the engine. 

(2) Reserved. 

(f) Credit for Previous Action 

You may take credit for the action required by paragraph (e) of this AD if you 

performed the action before the effective date of this AD in accordance with Turbomeca 

S.A. Mandatory Service Bulletin 292 77 0844, Version A, dated March 4, 2015. 

(g) 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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(b) 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 01 803; phone: 781-238-7770; fax: 781-238-7199; 

email: philip.haberlen@faa.gov. 

(2) Refer to MCAI European Aviation Safety Agency AD 2015-0175, dated 

August 24,2015, which includes Mandatory Service Bulletin No. 292 77 0844, Version 

B, dated July 6, 2015, for related information. You may examine the MCAI in the AD 

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

Docket No. F AA-2015-4070. 

(3) Turbomeca S.A. Mandatory Service Bulletin No. 292 77 0844, Version B, 

dated July 6, 2015, which is not incorporated by reference in this AD, can be obtained 

from Turbomeca S.A., using the contact information in paragraph (h)(4) of this AD. 

(4) For service information identified in this AD, contact 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, call781-238-7125. 

(i) Material Incorporated by Reference 

None. 

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Issued in Burlington, Massachusetts, on February 16, 2016. 

Ann C. Mollica, 

Acting Manager, Engine & Propeller Directorate, 

Aircraft Certification Service. 

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