[4910-13-P] DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA-2015-4866; Directorate Identifier 2015-NE-33-AD; Amendment 39-18648; AD 2016-18-17] RIN 2120-AA64 Airworthiness Directives; Honeywell International Inc. Turboprop and Turboshaft Engines AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Final rule. SUMMARY: We are adopting a new airworthiness directive (AD) for certain Honeywell International Inc. (Honeywell) TPE331 model turboprop engines and TSE331-3U model turboshaft engines. This AD was promptedby the discovery ofcracks in a 2nd stage compressor impeller during a routine shop visit. This AD requires removal ofthe 2nd stage compressor impeller. We are issuing this AD to prevent failure ofthe compressor impeller, uncontained partrelease, damage to the engine, and damage to the airplane. DATES: This AD is effective [INSERT DATE 35 DAYS AFTERDATE OF PUBLICATION IN THE FEDERAL REGISTER]. Examining the AD Docket You may examine the AD docket onthe Internet at http://www.regulations.gov by searching for and locating DocketNo. FAA-2015-4866; or in person at the Docket Management Facility between 9 a.m. and 5p.m., Monday through Friday, except Federal holidays. The AD docket contains this AD, the regulatory evaluation, any comments received, and other information. The address for the Docket Office (phone: 800-647-5527) is DocumentManagement Facility, U.S. Department ofTransportation,Docket Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New Jersey Avenue SE., Washington, DC 20590. FORFURTHERINFORMATION CONTACT: Joseph Costa, Aerospace Engineer, Los Angeles Aircraft Certification Office, FAA, Transport Airplane Directorate, 3960 Paramount Blvd., Lakewood, CA 90712-4137; phone: 562-627-5246; fax: 562-627-5210; email:joseph.costa@faa.gov. SUPPLEMENTARY INFORMATION: Discussion We issued a notice ofproposed rulemaking (NPRM) to amend 14 CFRpart 3 9 by adding an AD that would apply to certain Honeywell TPE331 model turboprop engines and TSE331-3U model turboshaft engines. The NPRM published in the Federal Register

on March 15, 2016 (81 FR 13764) ("the NPRM"). The NPRM was prompted by the discovery ofcracks in a 2nd stage compressor impeller during a routine shop visit. The NPRM proposed to require removal ofthe 2nd stage compressor impeller. We are issuing this AD to prevent failure ofthe compressor impeller, uncontained partrelease, damage to the engine, and damage to the airplane. Comments We gave the public the opportunity to participate in developing this AD. The following presents the comments received onthe NPRM and the FAA's response to each comment. Request to Change Compliance Bearskin Airlines and Turbine Standard, LTD requested that the compliance time interval be changed because many TPE331 engine operators are on a Continuous Airworthiness Maintenance (CAM) program: This program does notrequire impeller inspections perthe overhaul manual and the impeller is not considered as "overhauled".

2AD compliance under CAM may be interpreted as being within 200 cycles or 30 to 45 days. Other commenters requested that the compliance time be changedto a less aggressive time interval appropriate to the unsafe condition. Many high-usage operators have suspect impellers that currently exceed 7,000 cycles since the last compressor inspection. We agree. We changed compliance interval in paragraph (e)(1) ofthis AD. Request to Allow Other Inspection Facilities to Return Impellers to Service Turbine Standard, LTD requested that this AD allow other inspection facilities to return impellers to service. There are many inspection facilities that are capable of inspecting the 2nd stage compressor impeller. We partially agree. We agree that many inspection facilities are capable of performing a focused inspection ofthe 2nd stage compressor impeller. We disagree with allowing other inspection and regrinding facilities to return impellers to service. This AD does not address inspection orregrinding ofthe curvic area ofthe 2nd stage compressor impeller. Regrinding ofthe curvic area ofthe 2nd stage compressor impeller involves machining ofa critical rotating part, which must be approved by the FAA. We did not change this AD. Request to Change Costs ofCompliance Honeywell; Perimeter Aviation, LP; and Intercontinental Jet Service Corp. requested that the costs ofcompliance be changed because the NPRM is not representative ofthe impeller's replacement costs. Honeywell quotes the cost ofa new 2nd stage compressor impeller at $11,922.50. We partially agree. We agree with the commentbecause the costs were not clearly defined. We disagree withthe commentbecause replacement costs are based onpro-rated costs that are estimated at 50% ofnewparts costs. Since issuing the NPRM, the FAA

3estimated that 30% ofimpellers will be scrapped; therefore, we changed the costs of compliance accordingly. 

### Request to Include Service Information The European Aviation Safety Agency, Honeywell, and Candler & Associates, Inc. requested that service informationbe included inthis AD. Having the service information available would aid in understanding any differences between this AD and the service information. We agree. We added Honeywell Service Bulletin (SB) TPE331-72-2208, dated July 29, 2014, as related information in this AD. 

### Conclusion We reviewed the relevant data, consideredthe comments received, and determinedthat air safety and the public interest require adopting this AD withthe changes described previously. We also determined that these changes will not increase the economic burden on any operator or increase the scope ofthis AD. 

### Related Service Information We reviewed Honeywell SB TPE331-72-2208, dated July 29,2014. The SB describes procedures for replacing the 2nd stage compressor impeller. 

### Costs ofCompliance We estimate thatthis AD will affect 4,000 engines installed on airplanes ofU.S. registry. We estimate that it will take 2 hours perengine to comply withthis AD. The average labor rate is $85 perhour. We also estimate that required parts will cost about $4,404 per engine. Based onthese figures, we estimate the total cost ofthis AD on U.S. operators to be $18,298,000.

4Authority 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 withpromoting 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 conditionthat is likely to exist or develop on products identified inthis rulemaking action. Regulatory Findings This AD will not have federalism implications under Executive Order 13132. This AD will not have a substantial direct effect on the States, onthe relationship betweenthe national government and the States, or onthe distribution ofpower and responsibilities among the various levels ofgovernment. Forthe reasons discussed above, I certify that this AD: (1) Is not a "significantregulatory action" under Executive Order 12866, (2) Is not a "significantrule" under DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979), (3) Will not affect intrastate aviation in Alaskato the extent that itjustifies making a regulatory distinction, and (4) Will not have a significant economic impact, positive or negative, on a substantial number ofsmall entities under the criteria ofthe Regulatory FlexibilityAct.



### 5

### List ofSubjects in 14 CFRPart39 Airtransportation, Aircraft, Aviation safety, Incorporation by reference, Safety. 

### Adoption ofthe Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFRpart 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): 2016-18-17 

### Honeywell International Inc. (Type Certificate previously held by AlliedSignal Inc., GarrettEngine Division; GarrettTurbine Engine Company; and AiResearch Manufacturing Company ofArizona): Amendment 39-18648; Docket No. FAA-2015-4866; Directorate Identifier 2015-NE-33-AD. 

### (a) Effective Date This AD is effective [INSERT DATE 35 DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER]. 

### (b) Affected ADs None. 

### (c) Applicability This AD applies to Honeywell International Inc. (Honeywell) TPE331-3U, -3UW, -5, -SA, -5AB, -5B, -6, -6A, -8, -10, -lOAV, -lOGP, -lOGT, -ION, -lOP, -lOR, -lOT, -lOU, -lOUA, -lOUF, -lOUG, -lOUGR, -lOUR, and -11U model turboprop engines, and TSE331-3U model turboshaft engines, with a 2nd stage compressor impeller,part number (PIN) 893482-1 through -5, inclusive, or

### PIN 3107056-1 or

### PIN 3107056-2, installed.

6(d) Unsafe Condition This AD was prompted by the discovery ofcracks in a 2nd stage compressor impeller during a routine shop visit. We are issuing this AD to prevent failure ofthe compressor impeller, uncontained part release, damage to the engine, and damage to the airplane. (e) Compliance Comply withthis AD within the compliance times specified, unless already done. (1) Remove from service the 2nd stage compressor impeller at nextremoval ofthe 2nd stage compressor impeller from the engine orbefore exceeding 11,500 cycles in service afterthe effective date ofthis AD, whichever occurs first. (2) Reserved. (f) Installation Prohibition After the effective date ofthis AD, do not install a 2nd stage compressor impeller, part number (PIN) 893482-1 through -5, inclusive, or

### PIN 3107056-1 or

### PIN 3107056-2, into any engine. (g) Alternative Methods ofCompliance (AMOCs) The Manager, Los Angeles Aircraft Certification Office, FAA, may approve AMOCs for this AD. Use the procedures found in 14 CFR 39.19 to make yourrequest. (h) Related Information (1) For more information about this AD, contact Joseph Costa, Aerospace Engineer, Los Angeles Aircraft Certification Office, FAA, Transport Airplane Directorate, 3960 Paramount Blvd., Lakewood, CA 90712-4137; phone: 562-627-5246; fax: 562-627-5210; email:joseph.costa@faa.gov. (2) Honeywell SB TPE331-72-2208, dated July 29, 2014, which is not incorporated by reference in this AD, can be obtained from Honeywell, using the contact information inparagraph (h)(3) ofthis AD.

7(3) ForHoneywell service information identified inthis AD, contact Honeywell International Inc., 111 S 34th Street, Phoenix, AZ 85034-2802; phone: 800-601-3099; Internet: https:/ /myaerospace.honeywell.com/wps/portal/!

### uti. (4) You may viewthis service information at FAA, Engine & Propeller Directorate, 1200 District Avenue, Burlington, MA. Forinformation on the availability of this material at the FAA, call 781-238-7125. (i) Material Incorporated by Reference None.

Issued in Burlington, Massachusetts, on August 26, 2016.

Colleen M. D'Alessandro, Manager, Engine & Propeller Directorate, Aircraft Certification Service.

8