[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 Admini stration (FAA), DOT. ACTION: Final rule. 

# .. SUMMARY: We are adopting a new airworthiness directive (AD) for certain Tur bomeca S.A. Arriel 1 E2 turboshaft engin es. 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 failur e ofthe tachometer box, which could lead to failure ofthe e ngi ne, IFSD, and lo ss 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 Avenue, 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. FAA-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. FAA-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 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

. 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 24,20 15 (80 FR 73147). The NPRM proposed to correct an un safe condition for the specifi ed products. The MCAI states: There have been reports of Arriel 1E2 engines having experienced an uncommanded in-flight shut-down (IFSD) due to an untimely activation ofthe tachometer box shut-off system which was activated by the power turbine monitoring function ofthe tachometer box. 

### 2This 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.



### 3We 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 c iv il aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator fmds necessary fo r safety in air commerce. Thi s reg ulation is within the scope ofthat authority because it addre sses 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 1 3 1 32. This AD will not have a s ubstantial direct eiTect on the States, on the relations hip between the national government and the States , or on the distribution of power and re spon s ibilities among the various level s of government. For the reaso ns 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 Polici es and Procedures (44 FR 11034 , February 26, 1979) , (3) Will not affect intrastate aviation in Alaska to the extent that it justifie s making a regulatory di s tinct ion, 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.



### 4Adoption 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 fo llows: 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 [IN SERT 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 5(iv) 

### PIN 95801171 10- all SINs (v) 

### PIN 95801 17550- all SINs 1499 and below with or without s uffix 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 identifi ed in paragraph (c)( 1) of this AD that al so have installed electrical connectors labeled as Pl0106 , P10098 , and Pl0108 ; or PllF, P13F, and P15F. 

### (d) Reason Thi s AD was prompted by reports ofuncommanded in-fli ght shutdowns ( IFSDs). We are issuing this AD to prevent failure of the tachometer box, whi ch could lead to fai lur e of the engi ne , IFSD , and loss ofcontro l of the helicopter. 

### (e) Actions and Compliance Comply with thi s AD within the co mpliance times specified, unl ess already done. (1) Within 1 ,600 flight hours after the effective date ofthi s AD, remove the affected tacho met er box from the engine. (2) Re served. (f) 

### Credit for Previous Action You may take credit for the action required by paragraph (e) of this AD if you performed the actio n before the effective date of this AD in accordance with Turbomeca S.A. Mandatory Service Bulletin 292 77 0844, Vers ion A, dated March 4 , 2015. 

### (g) Alternative Methods of Compliance (AMOCs) The Manager, Engine Certification Office, FAA, may approve AMOCs for thi s 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.

### 6(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: phi lip.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. FAA-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 thi s material at the FAA, call781-238-7125. 

### (i) Material Incorporated by Reference None.



### 7Issued in Burlington, Massachusetts, on February 16, 2016.

Ann C. Mollica, Acting Manager, Engine & Propeller Directorate, Aircraft Certification Service.



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