DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA-2015-0625; Directorate Identifier 2015-NE-09-AD] RIN 2120-AA64 Airworthiness Directives; GE Aviation Czech s.r.o. Turboprop Engines AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice ofproposed rulemaking (NPRM). [4910-13-P]

SUMMARY: We propose to adopt a new airworthiness directive (AD) for certain serial number GE Aviation Czech s.r.o. M601E-11, M601E-11A, and M601F turboprop engines with certain part number (PIN) gas generator turbine (GOT) blades, installed
. This proposed AD was prompted by the determination that certain GOT blades are susceptible to blade failure. This proposed AD would require removing from service any affected engine with certain GOT blades installed. We are proposing this AD to prevent GOT blade failure, which could lead to engine failure and loss ofthe airplane. DATES: We must receive comments on this proposed AD by [INSERT DATE 60 DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER]. ADDRESSES: You may send comments by any ofthe following methods:
• Federal eRulemaking Portal: Go to http://www.regulations
.gov. Follow the instructions for submitting comments.• Mail: Docket Management Facility, U.S. Department ofTransportation, 1200 New Jersey Avenue SE, West Building Ground Floor, Room W12-140, Washington, DC 20590-0001.
• Hand Delivery: Deliver to Mail address above between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays.
• Fax: 202-493-2251. For service information identified in this proposed AD, contact GE Aviation Czech s.r.o., Beranovych 65, 199 02 Praha 9- Letnany, Czech Republic; phone: +420 222 538 

### 111; fax: +420 222 538 222. You may view this service information at the FAA, Engine & Propeller Directorate, 12 New England Executive Park, Burlington, MA. For information on the availability ofthis material at the FAA, 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. FAA-2015-0625; or in person at the Docket Operations office 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 information (MCAI), the 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: Robert Green, Aerospace Engineer, Engine Certification Office, FAA, Engine & Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803 ; phone : 781-238-7754 ; fax: 781-238-7199; email: robert.green @ faa
.gov. 2SUPPLEMENTARY 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-2015-0625; Directorate Identifier 2015-NE-09-AD" at the beginning ofyour comments . We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects ofthis proposed AD. We will consider all comments received by the closing date and may amend this proposed AD based on 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 with FAA personnel concerning this proposed AD. Discussion The European Aviation Safety Agency (EASA), which is the Technical Agent for the Member States ofthe European Community, has issued EASA AD 2015-0015, dated January 30, 2015 (referred to hereinafter as "the MCAI"), to correct an unsafe condition for the specified products. The MCAI states: It has been demonstrated that non-shot peened Gas Generator Turbine (GGT) blades are susceptible to blade separation in the shank area due to their reduced fatigue life. This condition, ifnot corrected, could lead to an in-flight engine shutdown and, consequently, reduced control ofthe aeroplane
.

3You 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-2015-0625. Related Service Information under 1 CFR Part 51 GE Aviation Czech s.r.o. has issued Alert Service Bulletin (ASB) No. M601E11/30, dated December 23 , 2014, and ASB No. M601E-ll/31, M601E-11A/18, M601F/28, dated December 23,2014. The ASBs describe procedures for removal and replacement ofGGT blades that are not shot peened. This service information is reasonably available; see ADDRESSES for ways to access this service information. FAA's Determination and Requirements of This Proposed AD This product has been approved by the aviation authority ofthe Czech Republic, and is approved for operation in the United States. Pursuant to our bilateral agreement with the European Community, EASA has notified us ofthe unsafe condition described in the MCAI and service information referenced above. We are proposing this AD because we evaluated all information provided by EASA and determined the unsafe condition exists and is likely to exist or develop on other products ofthe same type design. This proposed AD would require removing from service any affected engine with GGT blades installed that are not shot peened. Costs of Compliance We estimate that this proposed AD affects one engine installed on an airplane of U.S
. registry
. We also estimate that it would take about 64 hours per engine to comply with this proposed AD
. The average labor rate is $85 per hour. Required parts cost about

4$28,765 per engine. Based on these figures , we estimate the cost ofthis proposed AD on U.S. operators to be $34,205. Authority for This Rulemaking Title 49 ofthe 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 ofthe 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 ofcivil 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 ofthat 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 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 ofpower and responsibilities among the various levels of government. For the reasons discussed above, I certify this proposed regulation : (1) Is not a " significant regulatory action" under Executive Order 12866,


### 5(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 itjustifies 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 ofthe Regulatory Flexibility Act. List of Subjects in 14 CFR Part 39 Air transportation, Aircraft, Aviation safety, Incorporation by reference, Saf ety. 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 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): GE Aviation Czech s.r.o. (Type Certificate previously held by WALTER Engines
a.s., Walter a.s., and MOTORLET a. s.): Docket No
. FAA

-2015-0625 ; Directorate Identifier 201 5

-NE-09

-AD
. (a) Comments Due Date We must receive comments by [INSERT DATE 60 DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER]. 6

### (b) Affected ADs None. (c) 

### Applicability This AD applies to certain serial number (SIN) GE Aviation Czech s.r.o. M601Ell, M601E-11A, and M601F turboprop engine models , with gas generator turbine (GGT) blade, part number (PIN) M601-3372.6 or M601-3372
.51 , installed, as follows : (1)ModelM601E-ll : SINs862001 , 863008 , 894018,034005,034006, 034007, 034008 , 041003 , and 042002. (2) Model M601E-11A: SINs 042003 , 042004, 044001 , 044002, and 961001. (3) Model M601F : SINs 024001 , 002001 , 003001 , 024001 , 934001 , 934002, 961001. 

### (d) Reason This AD was prompted by the determination that certain GGT blades are susceptible to blade failure. These blades are identified as blade PINs M601-3372
.6 and M601-3372
.51 , and are installed on an engine SIN identified in paragraph (c) ofthis AD. We are issuing this AD to prevent GGT blade failure, which could lead to engine failure and loss ofthe airplane. (e) 

### Actions and Compliance Comply with this AD within the compliance times specified, unless already done
. After the effective date ofthis AD: (1) Do not return to service any affected engine with GGT blade, 

### PIN M601- 3372
.6 or M601-3372.51 , installed, after 300 hours time in service or six months , whichever occurs first, after the effective date ofthis AD
. 7(2) Ifthe affected engines are subsequently disassembled or overhauled, the nonshot peened GGT blades, 

### PIN M601-3372.6 or M601-3372.51 , are not eligible for installation in any other engine after removal. (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 39
. 19 to make your request. You may email your request to: ANE-AD-AMOC @ faa.gov. (g) Related Information (1) For more information about this AD, contact Robert Green, Aerospace Engineer, Engine Certification Office, FAA, Engine & Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803 ; phone: 781-238-7754; fax : 781-238- 7199 ; email: robert
.green @ faa.gov. (2) Refer to MCAI European Aviation Safety Agency AD 2015-0015, dated January 30,2015, 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-2015-0625. (3) GE Aviation Czech s.r.o. Alert Service Bulletin (ASB) No. M601E-11 /30, dated December 23 , 2014, which is co-published as one document with M601D-1 /31 , M601Z/29, and M601 T/24, and ASB No. M601E-11/31, M601E-11A/18, M601F/28, dated December 23,2014, which is co-published as one document with M601D-1 /32, M601Z/30, M60 1E/61 , M601T/25 , M601FS/12 , M601F

-22/25 , M601F

-32/23 , and M60 1 E-21/28 , are not incorporated by reference in this AD. The ASBs can be obtained



### 8from GE Aviation Czech s.r.o. using the contact information in paragraph (g)(4) ofthis proposed AD. (4) For service information identified in this proposed AD, contact GE Aviation Czech s.r.o ., Beranovych 65, 199 02 Praha 9- Letiiany; Czech Republic ; phone: +420 222 538 111; fax: +420 222 538 222. (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 ofthis material at the FAA, call 781-238-7125. Issued in Burlington, Massachusetts, on April 7, 2015.

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

9