DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFRPart 39 [DocketNo. FAA-2015-4866; Directorate Identifier 2015-NE-33-AD[ RIN 2120-AA64 [4910-13-P[

Airworthiness Directives; Honeywell International Inc. Turboprop and Turboshaft Engines AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice ofproposed rulemaking (NPRM). SUMMARY: We propose to adopt a new airworthiness directive (AD) for certain Honeywell International Inc. (Honeywell) TPE331 model turboprop engines and TSE331-3U model turboshaft engines. Thisproposed AD was promptedby the discovery ofcracks in a 2nd stage compressorimpellerduring a routine shop visit. This proposed AD would require removal ofthe 2nd stage compressor impeller. We are proposing this AD to prevent failure ofthe compressor impeller, uncontained part release, damage to the engine, and damage to the 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, using the procedures found in 14 CFR 11.43 and 11.45, by any ofthe following methods:

• Federal eRulemakingPortal: Go to http://www.regulations.gov. Followthe instructions for submitting comments.



### • Fax: 202-493-2251.

• Mail: U.S. Department ofTransportation, Docket Operations, M-30, West Building Ground Floor, Room W12-140, 1200 NewJersey Avenue SE., Washington, DC 20590.• Hand Delivery: Deliverto Mail address above between 9 a.m. and 5 p.m., Monday through Friday, exceptFederal holidays. 

### Examining the AD Docket You may examine the AD docket onthe Internet at http://wwvv.regulations.gov by searching for and locating DocketNo. FAA-2015-4866; or in person atthe Docket Management Facility between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this proposed AD, the regulatory evaluation, any comments received, and other information. The street address for the Docket Office (phone: 800-647-5527) is in the ADDRESSES section. Comments will be available inthe AD docket shortly after receipt. 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: 

### Comments Invited We invite you to send any written relevant data, views, or arguments about this NPRM. Send your conunents to an address listed under the ADDRESSES section. Include "DocketNo. FAA-2015-4866; Directorate Identifier 2015-NE-33-AD" atthe beginning ofyour conunents. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects ofthis NPRM. We will consider all comments received by the closing date and may amend this NPRM because ofthose comments. We will post all comments we receive, without change, to http://www.regulations.gov, including any personal information you provide. We will

2also post a report summarizing each substantive verbal contact we receive aboutthis NPRM. 

### Discussion Several 2nd stage compressorimpellers were found cracked in the aft curvic root radius when inspected during a routine shop visit. This condition, ifnotcorrected, could result in failure ofthe compressor impeller, uncontainedpartrelease, damage to the engine, and damage to the airplane. 

### FAA's Determination We are proposing this NPRM because we evaluated all the relevant information and determined the unsafe condition describedpreviously is likely to exist or develop in otherproducts ofthe same type design. 

### Proposed AD Requirements This NPRM would require accomplishing the actions specified inthe service information described previously. 

### Costs ofCompliance We estimate that this proposedAD would affect4,000 engines installed on airplanes ofU.S. registry. We estimatethat it would take 0 hours per engine to comply with this proposedAD. The average labor rate is $85 perhour. We also estimate that required parts would cost about $1,513.25 per engine. Based onthese figures, we estimate the total cost ofthis proposed AD onU.S. operatorsto be $6,053,000. 

### 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.

3We are issuingthis rulemaking underthe authority described in Subtitle VII, PartA, SubpartIII, Section 44701: "General requirements." Underthat 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 ordevelop onproducts identified in this rulemaking action. 

### Regulatory Findings We determined thatthis proposedAD would not have federalism implications under Executive Order 13132. This proposedAD wouldnothave a substantial direct effect onthe States, onthe relationship between the national Government andthe States,

or on the distribution ofpower and responsibilities among the various levels of government. Forthe reasons discussed above, I certifythis proposed regulation: (1) Is not a "significantregulatory action" under Executive Order 12866, (2) Is not a "significantrule" m1der the DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979), (3) Will not affect intrastate aviation inAlaskato the extentthat itjustifies making a regulatory distinction, and (4) Will nothave a significant economic impact, positive ornegative, on a substantial number ofsmall entities m1der the criteria ofthe Regulatory FlexibilityAct. 

### List ofSubjects in 14 CFR Part 39 Airtransportation, Aircraft, Aviation safety, Incorporationby reference, Safety. 

### The Proposed Amendment Accordingly, tmder the authority delegatedto me by the Administrator, the FAA proposes to amend 14 CFRpart 39 as follows: 4PART 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 addingthe following new airworthiness directive (AD): Honeywell International Inc. (Type Certificate previously held by AlliedSignal Inc., Garrett Engine Division; Garrett Turbine Engine Company; and AiResearch Manufacturing Company ofArizona): DocketNo. FAA-2015-4866; Directorate Identifier 2015-NE-33-AD. (a) Comments Due Date We mustreceive comments by [INSERT DATE 60 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, -SAB, -SB, -6, -6A, -8,-10, -lOAV, -lOGP, -lOGT, -!ON, -lOP, -lOR, -lOT, -lOU, -lOUA, -lOUF, -lOUG, -lOUGR, -lOUR, and -llU model turboprop engines, and TSE331-3U model turboshaft engines, with a 2nd stage compressor impeller, partnumber (PIN) 893482-1 through -5, inclusive, or

### PIN 31 07056-l or

### PIN 3107056-2, installed. (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. 

### 5(e) 

### Compliance Comply with this AD within the compliance times specified, unless already done. (1) Remove fTom service the 

### 2nd stage compressor impeller within 

### 200 cycles-inservice after the effective date ofthe AD, orbefore exceeding 

### 7,000 cycles since last overhaul, whichever occurs later. (t) Installation Prohibition Afterthe 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 fmmd in 14 CFR 39.19 to make your request. (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 ParamountBlvd., Lakewood, CA 90712-4137; phone: 562-627-5246; fax: 562-627-5210; email:joseph.costa@faa.gov.

Issued in Burlington, Massachusetts, on March 4, 

### 2016.

ColleenM. D'Alessandro, Manager, Engine & 

### Propeller Directorate, Aircraft Certification Service.

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