DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

14910-13-PI 

!Docket No. FAA-2015-0625; Directorate Identifier 2015-NE-09-AD; Amendment 

39-18253; AD 2015-17-20] 

RIN 2120-AA64 

Air·worthiness Directives; GE Aviation Czech s.r.o. Turboprop Engines 

AGENCY: Federal Aviation Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: We arc adopting a new airworthiness directive (AD) for certain serial 

number (SIN) GE Aviation Czech s.r.o. M60 I E-ll, M60 1 E-l l A, and M60 IF turboprop 

engines with certain part number (P/N) gas generator turbine (GGT) blades, installed. 

This AD requires removing from service any affected engine with certain GGT blades 

installed. This AD was prompted by the determination that certain GGT blades are 

susceptible to blade fa ilure. We are issuing this AD to prevent GGT blade failure, which 

could lead to engine fai lure and loss of the airplane. 

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

PUBLICATION IN THE FEDERAL REGISTER]. 

ADDRESSES: Sec the For Further Information Contact section. 

Examining tbc 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 15-0625; 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 W 12-140, 1200 New Jersey A venue SE., 

Washington, DC 20590. 

FOR FURTHER INFOR1\1ATION 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. go v. 

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 April21 , 2015 (80 FR 22136). The NPRM proposed to correct an 

unsafe condition for the specified products. The MCAI states: 

Comments 

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, if not corrected, could lead to an in-flight engine 

shutdown and, consequently, reduced control of the aeroplane. 

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

received no comments on the NPRM (80 FR 22 136, April2 1, 2015). 

In our review of the NPRM, we found that we had included an SIN from the 

MCAI that was in error. We corrected the error by removing SIN 961001 from paragraph 

(c)(2) ofthis AD. 

2 
Conclusion 

We reviewed the available data and determined that air safety and the publi c 

interest require adopting this AD with the changes described previously. We determined 

that these changes will not increase the economic burden on any operator or increase the 

scope of this 1\0. 

Costs of Compliance 

We estimate that this AD affects one engine installed on an a irplane of U.S. 

registry. We also estimate that it would take about 64 hours per engine to comply with 

this AD. The average labor rate is $85 per hour. Required parts cost about $28,765 per 

engine. Based on these figures, we estimate the cost of this AD on U.S. operators to be 

$34,205. 

Authority for This Rulemaking 

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

aviation safety. Subtitle I, section I 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 VII, 

Part A, Subpart III, Section 44701: General requirements." Under that section, Congress 

charges the FAA with promoting safe fli ght of civi l 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 13 132. This AD will not have a substantial direct effect on the States, on 

3 
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 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) Wi ll 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. 

L ist of Subjects in 14 CFR Part 39 

Air transporta tion, 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. 1 06(g), 401 13, 4470 1. 

§ 39.13 [Amended I 

2. The r: AA amends § 39.13 by adding the following new airworthiness directive 

(AD): 

2015-17-20 GE Aviation Czech s.r.o. (Type Certificate previously held by WALTER 

Engines a.s., Walter a.s., and MOTORLET a.s.): Amendment 39- 18253; Docket 1:1o. 

F AA-20 15-0625; Directorate Identifier 20 15-NE-09-AD. 

4 
(~ ) 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 certain seri al number (SIN) GE Aviation Czech s.r.o. M601 Ell, M601 E-llA, and M601 F turboprop engine models, with gas generator turbine (GGT) 

blade, part number (PIN) M601-3372.6 or M601-3372.51 , installed, as follows: 

(1)Model M601E-11: SINs862001 , 863008, 894018,034005, 034006, 034007, 

034008, 041003, and 042002. 

(2) Model M601E-llA: SINs 042003,042004,044001, and 044002. 

(3) Model M60IF: SINs 024001 , 002001 , 003001 , 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) of this AD. 

We are issuing this AD to prevent GGT blade failure, which could lead to engine failure 

and loss of the airplane. 

(e) Actions and Compliance 

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

After the effective date of this AD: 

(I) Do not return to service any affected engine with GGT blade, PIN M601-

3372.6 or M601-3372.5 1, installed, after 300 hours time in service or six months, 

whichever occurs first, after the effecti ve date of this AD. 

5 
(2) lfthe affected engines are subsequently disassembl ed or overhauled, the nonshot peened GGT blades, PIN M60 1-3372.6 or M60 1-3372.5 1, arc not e ligible for 

install ation in any other engine after removal. 

(t) 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 

(I) 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: 78 1-238-7754; fax: 781-238-

7199; emai I: robert.green@faa.gov. 

(2) Refer toMCAT European Aviation Safety Agency AD 2015-0015, dated 

January 30, 20 15, 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 

http://www.regulations.gov/#!documentDetaii;D=FAA-2015-0625-0002. 

(h) Material Incorporated by Reference 

None. 

Issued in Burlington, Massachusetts, on August 20, 2015. 

Colleen M. D' Alessandro, 

Directorate Manager, Engine & Propeller Directorate, 

Aircraft Certification Service. 

6